:root {
  --bg: #030710;
  --panel: rgba(8, 16, 34, 0.62);
  --line: rgba(120, 190, 255, 0.16);
  --text: #eaf2ff;
  --muted: #9db1d3;
  --cyan: #5ad1ff;
  --cyan-deep: #1b8fd1;
  --r: 20px;
  --gutter: clamp(20px, 5vw, 64px);
  --maxw: 1040px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0;
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  color: var(--text);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* Hintergrund liegt fest über der ganzen Seite; Inhalt scrollt darüber. */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--bg) url("/img/bg-wide.webp") 62% 40% / cover no-repeat;
}
.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(120% 80% at 50% 38%, rgba(3, 7, 16, 0) 30%, rgba(3, 7, 16, 0.55) 100%),
    linear-gradient(180deg, rgba(3, 7, 16, 0.25), rgba(3, 7, 16, 0.55));
}
@media (max-aspect-ratio: 1/1) {
  .bg { background-image: url("/img/bg-tall.webp"); background-position: 50% 30%; }
}

a { color: var(--cyan); }
.top { position: sticky; top: 0; z-index: 10; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 14px var(--gutter); backdrop-filter: blur(14px) saturate(140%); -webkit-backdrop-filter: blur(14px) saturate(140%); background: linear-gradient(180deg, rgba(3, 7, 16, 0.7), rgba(3, 7, 16, 0)); }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; letter-spacing: 0.2em; font-size: 15px; }
.brand img { border-radius: 50%; }
.top nav { display: flex; gap: 26px; }
.top nav a { color: var(--muted); text-decoration: none; font-size: 14px; transition: color 0.2s; }
.top nav a:hover, .top nav a:focus-visible { color: var(--text); }

main { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }

.hero { min-height: calc(100svh - 64px); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; padding: 24px 0 72px; }
.logo { border-radius: 50%; box-shadow: 0 0 0 1px rgba(120, 200, 255, 0.22), 0 0 70px rgba(60, 170, 255, 0.35), 0 0 160px rgba(30, 110, 255, 0.22); }
.eyebrow { margin: 34px 0 0; font-size: 13px; font-weight: 600; letter-spacing: 0.42em; text-transform: uppercase; color: var(--cyan); padding-left: 0.42em; }
h1 { font-size: clamp(40px, 8vw, 84px); line-height: 1.04; margin: 14px 0 18px; letter-spacing: -0.03em; font-weight: 700; text-wrap: balance; }
.lead { font-size: clamp(17px, 2.2vw, 21px); color: var(--muted); margin: 0 0 36px; }
.cta { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
.btn { display: inline-block; padding: 13px 26px; border-radius: 999px; border: 1px solid var(--line); color: var(--text); text-decoration: none; font-weight: 600; background: var(--panel); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s; }
.btn:hover, .btn:focus-visible { border-color: var(--cyan); transform: translateY(-1px); }
.btn.primary { background: linear-gradient(135deg, #7be0ff, var(--cyan-deep)); color: #03101c; border: 0; box-shadow: 0 8px 34px rgba(40, 150, 230, 0.35); }
.btn.primary:hover, .btn.primary:focus-visible { box-shadow: 0 10px 44px rgba(60, 180, 255, 0.5); }
.note { color: var(--muted); font-size: 14px; margin: 22px 0 0; }

.block { padding: clamp(48px, 8vw, 96px) 0 0; scroll-margin-top: 56px; }
.block:last-child { padding-bottom: clamp(48px, 8vw, 96px); }
h2 { font-size: clamp(26px, 4vw, 38px); margin: 0 0 14px; letter-spacing: -0.02em; }
h3 { font-size: 18px; margin: 0 0 6px; }
.sub { color: var(--muted); max-width: 660px; margin: 0; }
.steps { list-style: none; counter-reset: s; padding: 0; margin: 32px 0 28px; display: grid; gap: 14px; }
.steps li { counter-increment: s; position: relative; background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 24px 24px 24px 76px; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
.steps li::before { content: counter(s); position: absolute; left: 24px; top: 24px; width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center; font-weight: 700; color: #03101c; background: var(--cyan); }
.steps p { margin: 4px 0; color: var(--muted); }
pre { white-space: pre-wrap; overflow-wrap: anywhere; margin: 12px 0; padding: 14px 16px; background: rgba(2, 5, 12, 0.8); border: 1px solid var(--line); border-radius: 12px; overflow-x: auto; }
code { font: 13.5px/1.5 ui-monospace, SFMono-Regular, Menlo, monospace; color: var(--cyan); }
.small { font-size: 13.5px; color: var(--muted); }
.warn { border-left: 3px solid var(--cyan-deep); padding-left: 12px; margin-top: 18px; max-width: 700px; }
.download { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.facts { list-style: none; padding: 0; margin: 20px 0 0; display: grid; gap: 12px; }
.facts li { background: var(--panel); border: 1px solid var(--line); border-radius: var(--r); padding: 18px 22px; color: var(--muted); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); }
footer { text-align: center; color: var(--muted); font-size: 13px; padding: 24px 16px calc(40px + env(safe-area-inset-bottom)); border-top: 1px solid var(--line); margin: 0 var(--gutter); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

@media (max-width: 560px) {
  .top nav { gap: 18px; }
  .logo { width: 132px; height: 132px; }
  .steps li { padding: 20px 18px 20px 62px; }
  .steps li::before { left: 18px; top: 20px; width: 30px; height: 30px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .btn, .top nav a { transition: none; } }