/* ============================================================
   base.css — Reset, Body-Typografie, Utility-Klassen
   ============================================================ */

*,
*::before,
*::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--nav-h);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

body {
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: var(--weight-regular);
  line-height: var(--lh-body);
  color: var(--ink-on-paper);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'kern' 1, 'liga' 1, 'ss01' 0;
  min-height: 100vh;
  /* clip statt hidden: kappt horizontalen Overflow OHNE einen Scroll-Container
     zu erzeugen. hidden würde implizit overflow-y:auto setzen und damit
     position:sticky (Hero-Pinning) auf iOS Safari brechen. hidden bleibt als
     Fallback für sehr alte Browser, clip gewinnt wo unterstützt. */
  overflow-x: hidden;
  overflow-x: clip;
}

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

a {
  color: inherit;
  text-decoration: none;
}

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

ul, ol { list-style: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-medium);
  letter-spacing: var(--tracking-tight);
  line-height: var(--lh-heading);
  text-wrap: balance;
}

p { max-width: 70ch; }

/* ─── Skip-Link ──────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--container-padding);
  background: var(--ink);
  color: var(--paper-on-ink);
  padding: var(--space-2xs) var(--space-s);
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  text-transform: uppercase;
  letter-spacing: var(--tracking-mono);
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease-out);
}
.skip-link:focus {
  top: var(--space-2xs);
  outline: 2px solid var(--spot);
}

/* ─── Container ──────────────────────────────────── */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

/* ─── Mono-Label ─────────────────────────────────── */
.mono {
  font-family: var(--font-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--tracking-mono);
  text-transform: uppercase;
  font-weight: var(--weight-regular);
  line-height: var(--lh-mono);
}
.mono--s { font-size: var(--fs-mono-s); }

/* ─── Section-Primitiv ───────────────────────────── */
.section {
  padding-block: clamp(3.5rem, 8vw, 6.5rem);
  position: relative;
}
.section--dark {
  background: var(--ink);
  color: var(--paper-on-ink);
}
.section--paper-2 {
  background: var(--paper-2);
}

/* ─── Reveal-on-Scroll ───────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 500ms var(--ease-out),
              transform 500ms var(--ease-out);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ─── Focus ──────────────────────────────────────── */
:focus { outline: none; }
:focus-visible {
  outline: 2px solid var(--spot);
  outline-offset: 3px;
}
.section--dark :focus-visible,
.hero :focus-visible {
  outline-color: var(--spot-on-ink);
}

/* ─── Selection ──────────────────────────────────── */
::selection {
  background: var(--spot);
  color: var(--paper);
}
.section--dark ::selection,
.hero ::selection {
  background: var(--spot-on-ink);
  color: var(--ink);
}

/* ─── Sr-only ────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}