/* Platform7 — Landingpage */

:root {
  /* Default = LIGHT */
  --bg: oklch(1 0 0);
  --bg-elev: oklch(0.985 0.001 0);
  --bg-soft: oklch(0.965 0.002 0);
  --fg: oklch(0.16 0.005 70);
  --fg-soft: oklch(0.40 0.008 70);
  --fg-mute: oklch(0.58 0.008 70);
  --line: oklch(0.16 0.005 70 / 0.10);
  --line-soft: oklch(0.16 0.005 70 / 0.05);
  --accent: oklch(0.86 0.13 92);
  --accent-soft: oklch(0.86 0.13 92 / 0.18);
  --accent-fg: oklch(0.16 0.005 70);

  --font-display: "Inter Tight", "Inter", system-ui, -apple-system, sans-serif;
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --pad-x: clamp(20px, 5vw, 80px);
  --section-pad: clamp(80px, 14vh, 180px);
}

[data-theme="dark"] {
  --bg: oklch(0.18 0.008 70);
  --bg-elev: oklch(0.22 0.009 70);
  --bg-soft: oklch(0.26 0.01 70);
  --fg: oklch(0.96 0.012 85);
  --fg-soft: oklch(0.78 0.012 80);
  --fg-mute: oklch(0.58 0.012 75);
  --line: oklch(0.96 0.012 85 / 0.14);
  --line-soft: oklch(0.96 0.012 85 / 0.06);
  --accent-fg: oklch(0.18 0.008 70);
}

[data-theme="light"] {
  --bg: oklch(1 0 0);
  --bg-elev: oklch(0.985 0.001 0);
  --bg-soft: oklch(0.965 0.002 0);
  --fg: oklch(0.16 0.005 70);
  --fg-soft: oklch(0.40 0.008 70);
  --fg-mute: oklch(0.58 0.008 70);
  --line: oklch(0.16 0.005 70 / 0.10);
  --line-soft: oklch(0.16 0.005 70 / 0.05);
  --accent-fg: oklch(0.16 0.005 70);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-feature-settings: "ss01", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;
  transition: background-color 0.4s ease, color 0.4s ease;
}
html { overflow-x: clip; }

::selection { background: var(--accent); color: var(--accent-fg); }

/* Display */
.display {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.04em;
  line-height: 0.92;
  text-wrap: balance;
}

.display em {
  font-style: normal;
  font-weight: 500;
  color: var(--accent);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
}

.eyebrow .dot {
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 8px;
  vertical-align: 1px;
}

.lead {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.5;
  color: var(--fg-soft);
  max-width: 56ch;
  text-wrap: pretty;
}

/* Layout primitives */
.section {
  position: relative;
  padding: var(--section-pad) var(--pad-x);
}

.section--sticky {
  min-height: 100vh;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
}

/* Top nav */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px var(--pad-x);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--fg);
  pointer-events: none;
}
.nav > * { pointer-events: auto; }
/* Nav-Text folgt dem Theme. Über dunklen Vollbild-Sektionen (Referenz-Durchflug)
   schaltet fly-refs.js auf .nav--inverse. Der frühere mix-blend-mode-Trick griff
   nicht: die fixierte Nav isoliert ihren Stacking-Context, der Blend sah die
   Seite dahinter nie — Ergebnis war Weiß auf Weiß. */
.nav--inverse { color: oklch(0.95 0.005 80); }
.nav--inverse .nav__logo--light { display: none; }
.nav--inverse .nav__logo--dark { display: block; }
.nav__brand {
  font-weight: 600;
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  color: inherit;
}
.nav__logo {
  height: 32px;
  width: auto;
  display: block;
}
/* Logo-Swap: helles Logo (dunkle Marke) im Light-Theme, echtes Reverse-Logo im
   Dark-Theme — statt Farb-Invertierung nun eine eigene Reverse-Grafik. */
.nav__logo--dark { display: none; }
[data-theme="dark"] .nav__logo--light { display: none; }
[data-theme="dark"] .nav__logo--dark { display: block; }
.nav__links {
  display: flex;
  gap: 28px;
}
.nav__links a {
  color: inherit;
  text-decoration: none;
  opacity: 0.78;
  transition: opacity 0.2s;
}
.nav__links a:hover { opacity: 1; }
.nav__cta {
  font-family: var(--font-sans);
  font-size: 12.5px;
  font-weight: 500;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid currentColor;
  text-decoration: none;
  color: inherit;
}

@media (max-width: 720px) {
  .nav__links { display: none; }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.01em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.btn--primary {
  background: var(--fg);
  color: var(--bg);
}
.btn--primary:hover { transform: translateY(-1px); }
.btn--ghost {
  background: transparent;
  color: var(--fg);
  border-color: var(--line);
}
.btn--ghost:hover { background: var(--bg-soft); }
.btn--accent {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn--accent:hover { transform: translateY(-1px); }

.btn .arrow {
  display: inline-block;
  transition: transform 0.25s ease;
}
.btn:hover .arrow { transform: translateX(3px); }

/* Sticky-headline pattern (referenz) */
.sticky-head {
  position: sticky;
  top: 0;
  padding: 24vh 0 12vh;
  z-index: 1;
}
.sticky-head h2 {
  font-size: clamp(40px, 7.5vw, 116px);
  margin: 0;
  max-width: 18ch;
}

/* Reveal-on-scroll */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.9s cubic-bezier(.2,.6,.2,1), transform 0.9s cubic-bezier(.2,.6,.2,1);
  transition-delay: var(--rev-delay, 0ms);
}
[data-reveal].is-in {
  opacity: 1;
  transform: translateY(0);
}

/* Divider */
.rule {
  height: 1px;
  background: var(--line);
  margin: 0 var(--pad-x);
}

/* Footer */
footer.foot {
  padding: 48px var(--pad-x) 32px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--fg-mute);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  letter-spacing: 0.04em;
}
footer.foot a { color: inherit; text-decoration: none; }
footer.foot a:hover { color: var(--fg); }