/* solbytech – öffentliche Startseite (index.html, 404.html)
   Styleguide 16.03.2022: Primär #020000, Sekundär #FFFFFF, neutrale Grautöne, Systemschriften.
   Responsiv vom Handy bis 4K, ohne JavaScript, ohne externe Ressourcen. */

:root {
  --black: #020000;
  --white: #ffffff;
  --gray-050: #f3f3f3;
  --gray-200: #c8c8cb;
  --gray-400: #8d8d93;
  --gray-600: #55555b;
  --gray-850: #19191c;
  --gray-900: #0d0d0f;
  --line: rgba(255,255,255,.16);
  --line-strong: rgba(255,255,255,.34);
  --ease: cubic-bezier(.2,.8,.2,1);
  --mono: Consolas, "Cascadia Mono", "Courier New", monospace;
  --wrap: min(1240px, 100% - 2 * clamp(16px, 4vw, 48px));
}

* { box-sizing: border-box; }
html { background: var(--black); scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; color: var(--white); background: var(--black); font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif; font-size: 16px; line-height: 1.55; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
@media (min-width: 2200px) { body { font-size: 20px; } :root { --wrap: min(1560px, 100% - 96px); } }
img, svg { display: block; }
a { color: inherit; }
a:focus-visible, .btn:focus-visible { outline: 2px solid var(--white); outline-offset: 4px; }
h1, h2, h3, p { margin: 0; overflow-wrap: break-word; }
ul, ol { margin: 0; padding: 0; list-style: none; }
.wrap { width: var(--wrap); margin-inline: auto; }
.sbt-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.sbt-icon, .sbt-wordmark, .sbt-logo { fill: currentColor; overflow: visible; }
.ico { fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.eyebrow { color: var(--gray-200); font-size: .74em; font-weight: 800; letter-spacing: .22em; text-transform: uppercase; }

.skip-link { position: absolute; top: -100px; left: 16px; z-index: 100; padding: 10px 14px; color: var(--black); background: var(--white); font-weight: 800; text-decoration: none; }
.skip-link:focus { top: 12px; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: .6em; min-height: 52px; padding: 12px 22px; border: 1px solid var(--white); color: var(--black); background: var(--white); font-size: .88em; font-weight: 800; letter-spacing: .08em; text-decoration: none; text-transform: uppercase; transition: transform .2s var(--ease), background .2s ease, color .2s ease; touch-action: manipulation; }
.btn:hover { transform: translateY(-2px); background: var(--gray-050); }
.btn-small { min-height: 42px; padding: 8px 16px; font-size: .76em; }
.btn-ghost { color: var(--white); background: transparent; border-color: var(--line-strong); }
.btn-ghost:hover { background: rgba(255,255,255,.08); border-color: var(--white); }
.btn-invert { color: var(--white); background: var(--black); border-color: var(--black); }
.btn-invert:hover { background: var(--gray-850); }
.btn-invert-ghost { color: var(--black); background: transparent; border-color: rgba(2,0,0,.4); }
.btn-invert-ghost:hover { background: rgba(2,0,0,.06); border-color: var(--black); }

/* ---------- Header ---------- */
.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--line); background: rgba(2,0,0,.86); backdrop-filter: blur(10px); }
.header-inner { display: flex; align-items: center; gap: 24px; min-height: 72px; }
.brand-lockup { display: inline-flex; align-items: center; gap: 14px; color: var(--white); text-decoration: none; }
.brand-lockup .sbt-icon { width: 44px; height: 28px; }
.brand-lockup .sbt-wordmark { width: 168px; height: 15.5px; }
.site-nav { display: flex; gap: 26px; margin-left: auto; }
.site-nav a { color: var(--gray-200); font-size: .78em; font-weight: 700; letter-spacing: .12em; text-decoration: none; text-transform: uppercase; }
.site-nav a:hover { color: var(--white); }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--line); background-image: linear-gradient(rgba(255,255,255,.03) 1px, transparent 1px), linear-gradient(90deg, rgba(255,255,255,.03) 1px, transparent 1px); background-size: 48px 48px; }
.hero::after { position: absolute; inset: 0; background: radial-gradient(ellipse at 70% 40%, rgba(255,255,255,.07), transparent 55%), linear-gradient(90deg, var(--black) 10%, rgba(2,0,0,.3)); content: ""; pointer-events: none; }
.hero-inner { position: relative; z-index: 1; display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr); gap: clamp(32px, 5vw, 80px); align-items: center; padding: clamp(48px, 9vh, 110px) 0 clamp(56px, 10vh, 120px); }
h1 { margin-top: 18px; font-size: clamp(3.2rem, 9vw, 7.6rem); font-weight: 300; letter-spacing: -.065em; line-height: .86; text-transform: uppercase; }
h1 span { color: transparent; -webkit-text-stroke: 1px rgba(255,255,255,.85); font-weight: 700; }
.lead { max-width: 38em; margin-top: 26px; color: var(--gray-050); font-size: clamp(1.08em, 1.5vw, 1.3em); line-height: 1.5; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 32px; }
.facts { display: flex; flex-wrap: wrap; gap: 8px 18px; margin-top: 28px; color: var(--gray-400); font-family: var(--mono); font-size: .76em; letter-spacing: .06em; }
.facts li { display: flex; align-items: center; gap: 8px; }
.facts li::before { width: 6px; height: 6px; background: var(--white); content: ""; }

.hero-visual { position: relative; width: min(100%, 500px); aspect-ratio: 1; justify-self: end; border: 1px solid var(--line); background: radial-gradient(circle at center, rgba(255,255,255,.08), transparent 56%), var(--gray-900); overflow: hidden; }
.hero-visual::after { position: absolute; inset: 0; background: linear-gradient(135deg, transparent 48.7%, rgba(255,255,255,.08) 49%, rgba(255,255,255,.08) 49.3%, transparent 49.6%); content: ""; }
.orbit { position: absolute; border: 1px solid rgba(255,255,255,.17); border-radius: 50%; }
.orbit::after { position: absolute; top: 50%; left: -4px; width: 8px; height: 8px; background: var(--white); content: ""; }
.orbit-a { inset: 10%; animation: orbit 26s linear infinite; }
.orbit-b { inset: 21%; border-style: dashed; animation: orbit 19s linear infinite reverse; }
.orbit-c { inset: 32%; animation: orbit 13s linear infinite; }
.scan-line { position: absolute; z-index: 2; top: 0; bottom: 0; width: 1px; background: linear-gradient(transparent, var(--white), transparent); opacity: .5; animation: scan 7s var(--ease) infinite; }
.hero-core { position: absolute; z-index: 3; inset: 36%; display: grid; place-content: center; justify-items: center; gap: 8px; border: 1px solid var(--white); background: var(--black); text-align: center; }
.hero-core .sbt-icon { width: 48px; height: 31px; }
.hero-core strong { font-size: .8em; letter-spacing: .18em; }
.hero-core small { position: absolute; top: calc(100% + 14px); left: 50%; width: 220px; transform: translateX(-50%); color: var(--gray-400); font-size: .62em; letter-spacing: .12em; text-transform: uppercase; }
.signal { position: absolute; z-index: 4; display: flex; align-items: center; gap: 8px; padding: 6px 9px; border: 1px solid var(--line); color: var(--gray-200); background: rgba(2,0,0,.9); font-size: .62em; font-weight: 750; letter-spacing: .1em; text-transform: uppercase; }
.signal b { color: var(--white); }
.signal-a { top: 15%; left: 5%; animation: float 6s ease-in-out infinite; }
.signal-b { top: 46%; right: 4%; animation: float 6s ease-in-out -2s infinite; }
.signal-c { right: 9%; bottom: 12%; animation: float 6s ease-in-out -4s infinite; }

/* ---------- Sektionen ---------- */
.section { padding: clamp(64px, 10vw, 120px) 0; border-bottom: 1px solid var(--line); }
.section-alt { background: var(--gray-900); }
.section-head { max-width: 760px; margin-bottom: clamp(32px, 5vw, 56px); }
h2 { margin-top: 14px; font-size: clamp(1.9rem, 4.2vw, 3.2rem); font-weight: 400; letter-spacing: -.04em; line-height: 1.06; }
.section-lead { margin-top: 18px; color: var(--gray-200); font-size: 1.06em; }

.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.card { display: flex; flex-direction: column; padding: clamp(22px, 2.4vw, 32px); border: 1px solid var(--line); background: linear-gradient(180deg, rgba(255,255,255,.04), rgba(255,255,255,0)); transition: border-color .2s ease, transform .2s var(--ease); }
.card:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.card-featured { border-color: var(--line-strong); background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.01)); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.card-icon { display: grid; flex: none; width: 52px; height: 52px; place-items: center; border: 1px solid var(--line-strong); }
.card-icon .ico { width: 28px; height: 28px; }
.tag { color: var(--gray-200); font-family: var(--mono); font-size: .7em; font-weight: 800; letter-spacing: .08em; text-align: right; text-transform: uppercase; }
.card h3 { margin-top: 22px; font-size: 1.7em; font-weight: 700; letter-spacing: -.02em; }
.card > p { margin-top: 10px; color: var(--gray-200); }
.card > p strong { color: var(--white); }
.learn-title { margin-top: 20px !important; color: var(--white) !important; font-size: .74em; font-weight: 800; letter-spacing: .18em; text-transform: uppercase; }
.learn { display: grid; gap: 8px; margin-top: 10px; }
.learn li { display: grid; grid-template-columns: 18px 1fr; gap: 8px; color: var(--gray-200); font-size: .95em; line-height: 1.45; }
.learn li::before { width: 8px; height: 8px; margin-top: .5em; background: var(--white); content: ""; }
.controls { margin-top: 18px !important; padding-top: 14px; border-top: 1px solid var(--line); color: var(--gray-400) !important; font-size: .82em; }
.card-btn { margin-top: auto; }
.card .controls + .card-btn { margin-top: 18px; }

.steps { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.steps li { padding: 28px 28px 8px 0; }
.steps li + li { padding-left: 28px; border-left: 1px solid var(--line); }
.step-no { color: var(--gray-400); font-family: var(--mono); font-size: .9em; font-weight: 800; }
.steps h3 { margin-top: 10px; font-size: 1.3em; }
.steps p { margin-top: 8px; color: var(--gray-200); }
.settings-note { margin-top: 36px; padding: 16px 18px; border-left: 2px solid var(--white); color: var(--gray-200); background: rgba(255,255,255,.04); font-size: .95em; }
.settings-note strong { color: var(--white); }

.reasons { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.reasons article { padding: 28px; border: 1px solid var(--line); }
.reasons h3 { margin-top: 20px; font-size: 1.25em; }
.reasons p { margin-top: 10px; color: var(--gray-200); }

.privacy { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: clamp(28px, 5vw, 72px); align-items: start; }
.privacy-copy p { color: var(--gray-050); font-size: 1.08em; }
.privacy-copy strong { color: var(--white); }
.privacy-copy .fineprint { margin-top: 16px; color: var(--gray-400); font-size: .9em; }
.fineprint a { color: var(--gray-200); }

.cta-band { color: var(--black); background: var(--white); border-bottom: 0; }
.cta-inner { display: grid; grid-template-columns: minmax(0, 1.2fr) auto; gap: 32px; align-items: center; }
.cta-band h2 { margin-top: 0; }
.cta-band p { max-width: 44em; margin-top: 14px; color: var(--gray-600); font-size: 1.06em; }
.cta-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- Footer ---------- */
.site-footer { padding: 40px 0 48px; border-top: 1px solid var(--line); }
.footer-inner { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 24px; }
.footer-brand .sbt-logo { width: 220px; height: 38.5px; }
.footer-brand p { margin-top: 14px; color: var(--gray-400); font-size: .85em; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 22px; }
.footer-nav a { color: var(--gray-200); font-size: .8em; font-weight: 700; letter-spacing: .12em; text-decoration: none; text-transform: uppercase; }
.footer-nav a:hover { color: var(--white); }

/* ---------- 404 ---------- */
.notfound { display: grid; min-height: calc(100vh - 160px); place-content: center; justify-items: start; gap: 18px; padding: 64px 0; }
.notfound h1 { font-size: clamp(3rem, 10vw, 7rem); }

/* ---------- Responsiv ---------- */
@media (max-width: 980px) {
  .site-nav { display: none; }
  .header-inner .btn-small { margin-left: auto; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { justify-self: center; width: min(100%, 420px); }
  .cards, .reasons { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; }
  .steps li, .steps li + li { padding: 22px 0 6px; border-left: 0; }
  .steps li + li { border-top: 1px solid var(--line); }
  .privacy, .cta-inner { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .brand-lockup .sbt-wordmark { width: 130px; height: 12px; }
  .brand-lockup .sbt-icon { width: 36px; height: 23px; }
  .hero-actions .btn, .cta-actions .btn, .card-btn { width: 100%; }
  .signal { font-size: .54em; }
  .hero-core small { width: 170px; }
}

@keyframes orbit { to { transform: rotate(360deg); } }
@keyframes scan { 0%,10% { left: 0; opacity: 0; } 20%,80% { opacity: .55; } 90%,100% { left: 100%; opacity: 0; } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}