/* Kassenbrücke – Website (Brand Guide 1.0). Statisch, ohne JavaScript, ohne externe Quellen.
   Tokens identisch mit dem Brand Guide; alle Text-/Hintergrund-Paare mindestens WCAG 2.2 AA. */

@font-face { font-family: "Public Sans"; src: url("../fonts/PublicSans-SemiBold.woff2") format("woff2"); font-weight: 600; font-style: normal; font-display: swap; }
@font-face { font-family: "Public Sans"; src: url("../fonts/PublicSans-Bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Atkinson Hyperlegible Next"; src: url("../fonts/AtkinsonHyperlegibleNext-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Atkinson Hyperlegible Next"; src: url("../fonts/AtkinsonHyperlegibleNext-Bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Atkinson Hyperlegible Mono"; src: url("../fonts/AtkinsonHyperlegibleMono-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }

:root {
  --kb-petrol-900: #062F37;
  --kb-petrol-800: #08414C;
  --kb-petrol-700: #0B5563;
  --kb-petrol-200: #9FC6CC;
  --kb-petrol-100: #E3F0F1;
  --kb-petrol-50:  #F2F8F8;
  --kb-amber-400:  #F2B33D;
  --kb-amber-700:  #8A5300;
  --kb-ink:         #1A2226;
  --kb-ink-2:       #4A5A60;
  --kb-line-strong: #7C8B91;
  --kb-line:        #D3DCDE;
  --kb-bg:          #FFFFFF;
  --kb-surface:     #F4F7F7;
  --kb-warning:     #7A4A00;
  --kb-warning-bg:  #FFF3D6;

  --font-heading: "Public Sans", "Segoe UI", Arial, sans-serif;
  --font-body:    "Atkinson Hyperlegible Next", "Segoe UI", Arial, sans-serif;
  --font-mono:    "Atkinson Hyperlegible Mono", ui-monospace, Consolas, monospace;

  --fs-display: clamp(2.25rem, 1.4rem + 3.4vw, 3.5rem);
  --fs-h2:      clamp(1.625rem, 1.3rem + 1.3vw, 2.125rem);
  --fs-h3:      clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --fs-lead:    clamp(1.1875rem, 1.1rem + 0.4vw, 1.375rem);
  --fs-body:    clamp(1.125rem, 1.09rem + 0.15vw, 1.1875rem);
  --fs-small:   1rem;
  --fs-figure:  clamp(2rem, 1.5rem + 2vw, 2.75rem);

  --space-2: 8px; --space-3: 12px; --space-4: 16px; --space-5: 24px; --space-6: 32px;
  --space-7: 48px; --space-8: 64px;
  --section-y: clamp(56px, 7vw, 96px);
  --container-max: 1200px;
  --page-margin: clamp(16px, 4vw, 40px);
  --radius-s: 4px; --radius-m: 8px; --radius-l: 12px;
  --control-height: 52px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0; background: var(--kb-bg); color: var(--kb-ink);
  font-family: var(--font-body); font-size: var(--fs-body); line-height: 1.6;
}
h1, h2, h3 { font-family: var(--font-heading); color: var(--kb-petrol-900); margin: 0; }
h1 { font-weight: 700; font-size: var(--fs-display); line-height: 1.15; letter-spacing: -0.012em; }
h2 { font-weight: 700; font-size: var(--fs-h2); line-height: 1.3; }
h3 { font-weight: 600; font-size: var(--fs-h3); line-height: 1.3; }
p { margin: 0; }
a { color: var(--kb-petrol-700); text-underline-offset: 3px; }
a:hover { color: var(--kb-petrol-800); }
:focus-visible { outline: 3px solid var(--kb-petrol-900); outline-offset: 2px; }
.inverse :focus-visible { outline-color: var(--kb-amber-400); }
svg { display: block; flex: none; }
code, .mono { font-family: var(--font-mono); }

.container { max-width: var(--container-max); margin: 0 auto; padding-inline: var(--page-margin); }
.section { padding-block: var(--section-y); }
.section--tint { background: var(--kb-petrol-50); }
.section--line { border-top: 1px solid var(--kb-line); }
.section-head { display: flex; flex-direction: column; gap: var(--space-3); max-width: 46em; margin-bottom: 40px; }
.muted { color: var(--kb-ink-2); }

.skip-link { position: absolute; left: var(--space-4); top: -100px; z-index: 10; background: var(--kb-petrol-900); color: #fff;
  padding: var(--space-3) var(--space-4); border-radius: var(--radius-s); font-weight: 700; }
.skip-link:focus { top: var(--space-4); color: #fff; }

/* Kopf */
.site-header { border-bottom: 1px solid var(--kb-line); background: var(--kb-bg); }
.site-header .container { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between;
  gap: 8px 32px; padding-block: var(--space-4); }
.brand { display: inline-flex; align-items: center; gap: 12px; min-height: 48px; text-decoration: none; }
.brand__name { font-family: var(--font-heading); font-weight: 700; font-size: 26px; letter-spacing: -0.012em;
  line-height: 1; color: var(--kb-petrol-900); }
.nav ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0 4px; }
.nav a { display: inline-flex; align-items: center; min-height: 48px; padding: 0 8px; color: var(--kb-ink);
  font-weight: 700; font-size: 18px; text-decoration: none; }
.nav a:hover { color: var(--kb-petrol-700); text-decoration: underline; }

/* Buttons */
.buttons { display: flex; flex-wrap: wrap; gap: var(--space-4); }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: var(--control-height);
  padding: 0 28px; border-radius: var(--radius-s); font-weight: 700; font-size: 19px; text-decoration: none;
  border: 2px solid var(--kb-petrol-700); }
.btn--primary { background: var(--kb-petrol-700); color: #fff; }
.btn--primary:hover { background: var(--kb-petrol-800); border-color: var(--kb-petrol-800); color: #fff; text-decoration: underline; }
.btn--secondary { background: #fff; color: var(--kb-petrol-700); }
.btn--secondary:hover { background: var(--kb-petrol-100); color: var(--kb-petrol-800); text-decoration: underline; }

/* Hero */
.hero { padding-block: clamp(48px, 7vw, 112px) clamp(56px, 7vw, 112px); }
.hero .container { display: flex; flex-wrap: wrap; align-items: center; gap: 48px 64px; }
.hero__text { flex: 1 1 520px; min-width: 0; display: flex; flex-direction: column; gap: var(--space-5); }
.tag { align-self: flex-start; background: var(--kb-petrol-100); color: var(--kb-petrol-700); font-weight: 700;
  font-size: 16px; padding: 6px 12px; border-radius: var(--radius-s); }
.lead { font-size: var(--fs-lead); line-height: 1.5; color: var(--kb-ink-2); max-width: 34em; }
.checks { list-style: none; margin: 0; padding: 8px 0 0; display: flex; flex-wrap: wrap; gap: 8px 28px;
  font-size: 17px; color: var(--kb-ink-2); }
.checks li { display: flex; align-items: center; gap: 8px; }

.schema { flex: 1 1 340px; min-width: 0; margin: 0; background: var(--kb-petrol-50); border-radius: var(--radius-l);
  padding: clamp(20px, 3vw, 36px); display: flex; flex-direction: column; }
.schema__item { background: #fff; border: 1px solid var(--kb-line); border-radius: var(--radius-m); padding: 20px;
  display: flex; align-items: center; gap: var(--space-4); }
.schema__item b { display: block; font-size: 18px; color: var(--kb-petrol-900); }
.schema__item span { font-size: 16px; color: var(--kb-ink-2); }
.schema__item--bridge { background: var(--kb-petrol-900); border: 0; border-top: 4px solid var(--kb-amber-400); }
.schema__item--bridge b { color: #fff; }
.schema__item--bridge span { color: var(--kb-petrol-200); }
.schema__link { align-self: center; width: 0; height: 28px; border-left: 2px dashed var(--kb-petrol-700); }
.icon-tile { width: 48px; height: 48px; flex: none; border-radius: var(--radius-s); background: var(--kb-petrol-100);
  display: flex; align-items: center; justify-content: center; }

/* Karten, Schritte */
.cards { display: flex; flex-wrap: wrap; gap: var(--space-5); list-style: none; margin: 0; padding: 0; }
.card { flex: 1 1 280px; min-width: 0; border: 1px solid var(--kb-line); border-radius: var(--radius-m); padding: 32px;
  display: flex; flex-direction: column; gap: var(--space-4); background: #fff; }
.steps { display: flex; flex-wrap: wrap; gap: var(--space-5); list-style: none; margin: 0; padding: 0; }
.step { flex: 1 1 220px; min-width: 0; background: #fff; border-radius: var(--radius-m); padding: 28px;
  display: flex; flex-direction: column; gap: var(--space-3); border-top: 4px solid var(--kb-petrol-700); }
.step--last { border-top-color: var(--kb-amber-400); }
.step__nr { font-family: var(--font-mono); font-size: 16px; color: var(--kb-petrol-700); letter-spacing: 0.04em; }
.step--last .step__nr { color: var(--kb-amber-700); }

/* Funktionen */
.split { display: flex; flex-wrap: wrap; gap: 32px 64px; }
.split__intro { flex: 1 1 300px; min-width: 0; display: flex; flex-direction: column; gap: var(--space-3); }
.features { flex: 2 1 480px; min-width: 0; list-style: none; margin: 0; padding: 0; }
.features li { display: flex; gap: var(--space-4); padding: 18px 0; border-top: 1px solid var(--kb-line); }
.features li:last-child { border-bottom: 1px solid var(--kb-line); }
.features li svg { margin-top: 3px; }
.features b { color: var(--kb-petrol-900); display: block; }
.features span { color: var(--kb-ink-2); }

/* Sicherheit */
.inverse { background: var(--kb-petrol-900); color: #fff; }
.inverse h2 { color: #fff; }
.inverse .muted { color: var(--kb-petrol-200); }
.figures { display: flex; flex-wrap: wrap; gap: var(--space-5); list-style: none; margin: 0; padding: 0; }
.figure { flex: 1 1 220px; min-width: 0; border-top: 1px solid var(--kb-petrol-200); padding-top: var(--space-5);
  display: flex; flex-direction: column; gap: var(--space-2); }
.figure__value { font-family: var(--font-heading); font-weight: 700; font-size: var(--fs-figure); line-height: 1.1; }
.figure__label { color: var(--kb-petrol-200); }

/* Pilot */
.pilot { background: var(--kb-warning-bg); border-top: 4px solid var(--kb-amber-400); border-radius: var(--radius-m);
  padding: clamp(28px, 4vw, 56px); display: flex; flex-wrap: wrap; gap: 32px 64px; align-items: flex-start; }
.pilot__text { flex: 2 1 420px; min-width: 0; display: flex; flex-direction: column; gap: var(--space-4); }
.pilot__text ul { margin: 0; padding-left: 22px; display: flex; flex-direction: column; gap: 4px; }
.pilot__cta { flex: 1 1 260px; min-width: 0; display: flex; flex-direction: column; gap: var(--space-3); align-items: flex-start; }
.eyebrow { font-family: var(--font-mono); font-size: 16px; color: var(--kb-warning); letter-spacing: 0.02em; }

/* Kontakt */
.contact { flex: 1 1 400px; min-width: 0; font-style: normal; border: 1px solid var(--kb-line); border-radius: var(--radius-m); }
.contact__row { display: flex; gap: var(--space-4); padding: 20px 24px; align-items: flex-start; }
.contact__row + .contact__row { border-top: 1px solid var(--kb-line); }
.contact__row svg { margin-top: 3px; }
.contact__label { display: block; font-size: 16px; color: var(--kb-ink-2); }

/* Fuß */
.site-footer { background: var(--kb-surface); border-top: 1px solid var(--kb-line); }
.site-footer .container { padding-block: 40px; display: flex; flex-direction: column; gap: var(--space-5); }
.site-footer__top, .site-footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between;
  align-items: center; gap: 16px 32px; }
.site-footer__bottom { border-top: 1px solid var(--kb-line); padding-top: 20px; font-size: 16px; color: var(--kb-ink-2); }
.site-footer__bottom a { color: var(--kb-ink-2); }
.site-footer .brand__name { font-size: 21px; }
.site-footer .nav a { font-weight: 400; font-size: 17px; color: var(--kb-petrol-700); text-decoration: underline; min-height: 44px; }

/* Textseiten (Impressum, Datenschutz, Barrierefreiheit, 404) */
.prose { max-width: 46em; display: flex; flex-direction: column; gap: var(--space-4); }
.prose h1 { font-size: clamp(2rem, 1.5rem + 2vw, 2.75rem); margin-bottom: var(--space-3); }
.prose h2 { font-size: var(--fs-h3); margin-top: var(--space-5); }
.prose ul { margin: 0; padding-left: 22px; }
.prose dl { margin: 0; display: grid; grid-template-columns: minmax(0, 14em) minmax(0, 1fr); gap: 6px 24px; }
.prose dt { font-weight: 700; }
.prose dd { margin: 0; }
.note { background: var(--kb-warning-bg); border-top: 4px solid var(--kb-amber-400); border-radius: var(--radius-m); padding: 20px 24px; }

@media (max-width: 600px) {
  .prose dl { grid-template-columns: 1fr; }
  .prose dd { margin-bottom: var(--space-3); }
}
@media print {
  .site-header .nav, .skip-link, .buttons { display: none; }
  .inverse { background: #fff; color: #000; }
  .inverse h2, .figure__label, .inverse .muted { color: #000; }
}