/* ===========================================================================
   Reset & Grundtypografie
   ========================================================================= */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h-scrolled) + 1.5rem);
}

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

body {
  margin: 0;
  /* `clip` statt `hidden`: verhindert seitliches Überlaufen (Off-Canvas-Navi),
     ohne `position: sticky` in Unterelementen zu zerstören. */
  overflow-x: clip;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-md);
  line-height: var(--lh-base);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  margin: 0;
  font-weight: 600;
  line-height: var(--lh-tight);
  letter-spacing: -0.018em;
  color: var(--ink);
  text-wrap: balance;
}

h1 { font-size: clamp(2.25rem, 5vw, var(--fs-5xl)); }
h2 { font-size: clamp(1.75rem, 3.4vw, var(--fs-3xl)); }
h3 { font-size: var(--fs-xl); }
h4 { font-size: var(--fs-base); }

p { margin: 0 0 var(--sp-4); }
p:last-child { margin-bottom: 0; }

a {
  color: var(--link);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
a:hover { color: var(--blue-800); }

img, svg, video { display: block; max-width: 100%; }
img { height: auto; }

ul, ol { margin: 0; padding: 0; }
li { list-style: none; }

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

hr {
  height: 0;
  margin: 0;
  border: 0;
  border-top: 1px solid var(--border);
}

::selection {
  background: var(--blue-600);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--blue-600);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Hilfsklassen -------------------------------------------------------- */

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

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--sp-4);
  z-index: 200;
  padding: var(--sp-3) var(--sp-5);
  background: var(--blue-800);
  color: #fff;
  border-radius: 0 0 var(--radius) var(--radius);
}
.skip-link:focus { top: 0; color: #fff; }

/* --- Mono-Label: das typografische Kernsignal ---------------------------- */

.label {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-label);
  text-transform: uppercase;
  color: var(--blue-600);
}
.label--muted { color: var(--slate-500); }
.label--on-dark { color: var(--blue-200); }

.label::before {
  content: "";
  width: 1.5rem;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
}
.label--bare::before { display: none; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

.lead {
  font-size: clamp(var(--fs-base), 1.6vw, var(--fs-lg));
  line-height: 1.55;
  color: var(--slate-700);
}

/* --- Icons --------------------------------------------------------------- */

.icon {
  width: 1.25em;
  height: 1.25em;
  flex: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}
.icon--lg { width: 1.75rem; height: 1.75rem; stroke-width: 1.5; }
.icon--sm { width: 1rem; height: 1rem; }