/* ─── Alpin Systems – Design ────────────────────────────────────────────── */
:root {
  --bg: #07090F;
  --bg-alt: #0B0E14;
  --surface: #10141C;
  --surface-2: #141A26;
  --border: #1E2430;
  --border-strong: #2A3550;
  --text: #F2F5FF;
  --text-muted: #8B93A7;
  --accent: #155EEF;
  --accent-light: #4D8CFF;
  --accent-dark: #0A2A6B;
  --accent-soft: rgba(21, 94, 239, 0.14);
  --radius: 18px;
  --radius-sm: 10px;
  --max: 1160px;
  --nav-h: 76px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }
body {
  margin: 0;
  font-family: 'Inter', 'Segoe UI', -apple-system, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; line-height: 1.12; font-weight: 700; letter-spacing: -0.015em; }
p { margin: 0; }
ul, ol { margin: 0; padding: 0; }
.container { width: min(var(--max), 100% - 2.5rem); margin-inline: auto; }

/* ─── Buttons ───────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .95rem 1.6rem; border-radius: 999px; font-weight: 600; font-size: 1rem;
  border: 1px solid transparent; cursor: pointer; font-family: inherit;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, border-color .15s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary { background: linear-gradient(135deg, var(--accent-light), var(--accent)); color: #fff; box-shadow: 0 8px 30px rgba(21,94,239,.35); }
.btn-primary:hover { box-shadow: 0 12px 40px rgba(21,94,239,.5); }
.btn-ghost { background: rgba(255,255,255,.04); border-color: rgba(255,255,255,.14); color: var(--text); backdrop-filter: blur(6px); }
.btn-ghost:hover { border-color: var(--accent-light); background: var(--accent-soft); }
.btn-small { padding: .6rem 1.15rem; font-size: .92rem; background: #fff; color: #07090F; }
.btn-small:hover { background: #E4ECFF; }
.btn-block { width: 100%; }

/* ─── Navigation ────────────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50; height: var(--nav-h);
  background: rgba(7, 9, 15, .6); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent; transition: border-color .2s ease, background .2s ease;
}
.nav.scrolled { border-bottom-color: var(--border); background: rgba(7, 9, 15, .85); }
.nav-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 2rem; }
.brand { display: flex; align-items: center; }
.brand-logo { height: 52px; width: auto; display: block; }
.brand-logo-sm { height: 40px; }
.nav-links { display: flex; align-items: center; gap: 1.6rem; font-weight: 500; font-size: .95rem; color: var(--text-muted); }
.nav-links a:not(.btn):hover { color: var(--text); }
.nav-toggle { display: none; background: none; border: 0; padding: .5rem; cursor: pointer; flex-direction: column; gap: 5px; }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .2s, opacity .2s; }

/* ─── Hero ──────────────────────────────────────────────────────────────── */
.hero { position: relative; min-height: calc(100vh - var(--nav-h)); display: flex; align-items: center; padding: clamp(4rem, 10vw, 7rem) 0 clamp(5rem, 12vw, 9rem); overflow: hidden; }
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-bg svg { width: 100%; height: 100%; display: block; }
.hero-bg::after { content: ""; position: absolute; inset: auto 0 0 0; height: 30%; background: linear-gradient(180deg, transparent, var(--bg)); }
.hero-inner { position: relative; z-index: 1; max-width: 52rem; }
.eyebrow { color: var(--accent-light); font-weight: 600; font-size: .82rem; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 1.1rem; }
.hero h1 { font-size: clamp(2.6rem, 6.4vw, 4.8rem); font-weight: 800; letter-spacing: -0.035em; margin-bottom: 1.5rem; }
.accent { background: linear-gradient(90deg, #7FAAFF, #3B82F6); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: clamp(1.05rem, 1.6vw, 1.25rem); color: #B9C1D6; max-width: 44rem; margin-bottom: 2.2rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-bottom: 2.6rem; }
.pillars { list-style: none; display: flex; flex-wrap: wrap; gap: .6rem; }
.pillars a {
  display: inline-block; padding: .5rem .95rem; border-radius: 999px; font-size: .88rem; font-weight: 500;
  border: 1px solid rgba(255,255,255,.12); background: rgba(255,255,255,.04); color: #D5DCEE; transition: border-color .15s, background .15s;
}
.pillars a:hover { border-color: var(--accent-light); background: var(--accent-soft); }

/* ─── Trust-Leiste ──────────────────────────────────────────────────────── */
.trust { border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); background: var(--bg-alt); }
.trust-inner { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem 2.4rem; padding: 1rem 0; font-size: .85rem; color: var(--text-muted); font-weight: 500; letter-spacing: .02em; }
.trust-inner span::before { content: "•"; color: var(--accent); margin-right: .6rem; }

/* ─── Sections ──────────────────────────────────────────────────────────── */
.section { padding: clamp(4rem, 9vw, 7rem) 0; }
.section-alt { background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { max-width: 48rem; margin-bottom: 3rem; }
.section-head h2, .demo-text h2, .contact-inner h2, .system-inner h2 { font-size: clamp(1.9rem, 3.8vw, 2.8rem); letter-spacing: -0.025em; }
.section-sub { color: var(--text-muted); font-size: 1.08rem; margin-top: 1rem; }

/* ─── Bento ─────────────────────────────────────────────────────────────── */
.bento { display: grid; grid-template-columns: repeat(12, 1fr); gap: 1.1rem; }
.span-7 { grid-column: span 7; }
.span-5 { grid-column: span 5; }
.bento-card {
  position: relative; background: linear-gradient(180deg, #11161F, #0D1118); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 2rem; display: flex; flex-direction: column; gap: .9rem; overflow: hidden;
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.bento-card::before { content: ""; position: absolute; inset: 0; background: radial-gradient(60% 50% at 100% 0%, rgba(21,94,239,.16), transparent 70%); opacity: 0; transition: opacity .3s; }
.bento-card:hover { border-color: var(--border-strong); transform: translateY(-3px); box-shadow: 0 20px 50px rgba(0,0,0,.35); }
.bento-card:hover::before { opacity: 1; }
.bento-card > * { position: relative; }
.bento-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: .3rem; }
.bento-icon { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent-light); }
.bento-icon svg { width: 24px; height: 24px; }
.bento-tag { font-size: .8rem; font-weight: 600; letter-spacing: .1em; color: var(--text-muted); }
.bento-card h3 { font-size: 1.45rem; }
.bento-card > p { color: #B9C1D6; }
.bento-list { list-style: none; display: grid; gap: .45rem; color: var(--text-muted); font-size: .95rem; }
.bento-list li { padding-left: 1.4rem; position: relative; }
.bento-list li::before { content: ""; position: absolute; left: 0; top: .6em; width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.bento-result { margin-top: auto; padding-top: 1rem; border-top: 1px solid var(--border); font-weight: 600; font-size: .95rem; color: var(--text); }

/* ─── System ────────────────────────────────────────────────────────────── */
.system-inner { display: grid; grid-template-columns: 1.1fr .9fr; gap: 4rem; align-items: center; }
.system-diagram { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; padding: 1.5rem; }
.system-diagram::before { content: ""; position: absolute; inset: 12% 18%; border: 1px dashed var(--border-strong); border-radius: 50%; opacity: .7; }
.node {
  position: relative; padding: 1rem 1.2rem; text-align: center; border-radius: 14px; font-weight: 600; font-size: .95rem;
  background: var(--surface); border: 1px solid var(--border); box-shadow: 0 10px 30px rgba(0,0,0,.3);
}
.node.core {
  grid-column: 1 / -1; justify-self: center; width: 60%; background: linear-gradient(135deg, var(--accent-light), var(--accent)); color: #fff; border-color: transparent;
  box-shadow: 0 12px 40px rgba(21,94,239,.45);
}

/* ─── Ablauf ────────────────────────────────────────────────────────────── */
.steps { list-style: none; display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.step { position: relative; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 2.2rem 1.8rem 1.8rem; }
.step-num { position: absolute; top: -16px; left: 1.6rem; width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%; background: var(--accent); color: #fff; font-weight: 700; box-shadow: 0 6px 20px rgba(21,94,239,.45); }
.step h3 { font-size: 1.2rem; margin: .4rem 0 .6rem; }
.step p { color: var(--text-muted); }

/* ─── Demo ──────────────────────────────────────────────────────────────── */
.demo-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: center; }
.demo-text h2 { margin-bottom: 1rem; }
.demo-text > p { color: var(--text-muted); font-size: 1.05rem; margin-bottom: 1.5rem; }
.checklist { list-style: none; margin: 0 0 2rem; display: grid; gap: .6rem; }
.checklist li::before { content: "✓"; color: var(--accent-light); font-weight: 700; margin-right: .6rem; }
/* Der Bot (400x640, fix 30px von unten/rechts) sitzt mittig im 460x700-Rahmen:
   das iframe ist 500px breit (damit nicht das Handy-Layout des Bots greift) und um 40px nach links geschoben. */
.demo-frame { position: relative; width: 460px; max-width: 100%; height: 700px; margin: 0 auto; border-radius: 22px; border: 1px solid var(--border); background: var(--surface); overflow: hidden; box-shadow: 0 30px 80px rgba(0,0,0,.5); }
.demo-frame iframe { position: absolute; top: 0; left: -40px; width: 500px; height: 100%; border: 0; background: transparent; }

/* ─── Über uns ──────────────────────────────────────────────────────────── */
.about { display: grid; grid-template-columns: 1fr 1.3fr; gap: 3rem; align-items: start; }
.about .section-head { margin-bottom: 0; }
.about-text { display: grid; gap: 1.1rem; color: var(--text-muted); font-size: 1.05rem; }
.about-text p:first-child { color: var(--text); }

/* ─── FAQ ───────────────────────────────────────────────────────────────── */
.faq-inner { display: grid; grid-template-columns: 1fr 1.4fr; gap: 3rem; align-items: start; }
.faq-inner .section-head { margin-bottom: 0; }
.faq { display: grid; gap: .6rem; }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 0 1.3rem; transition: border-color .2s; }
.faq details[open] { border-color: var(--border-strong); }
.faq summary { cursor: pointer; list-style: none; padding: 1.1rem 0; font-weight: 600; display: flex; justify-content: space-between; align-items: center; gap: 1rem; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font-size: 1.4rem; font-weight: 400; color: var(--accent-light); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--text-muted); padding: 0 0 1.2rem; }

/* ─── Kontakt ───────────────────────────────────────────────────────────── */
.section-cta { background: radial-gradient(70% 80% at 50% 0%, rgba(21,94,239,.2), transparent 70%), var(--bg-alt); border-top: 1px solid var(--border); }
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 3.5rem; align-items: start; }
.contact-links { display: grid; gap: .8rem; margin-top: 2rem; }
.contact-link { display: flex; align-items: center; gap: 1rem; padding: .9rem 1.1rem; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; transition: border-color .2s; }
.contact-link:hover { border-color: var(--accent); }
.contact-icon { width: 42px; height: 42px; display: grid; place-items: center; border-radius: 10px; background: var(--accent-soft); color: var(--accent-light); }
.contact-icon svg { width: 22px; height: 22px; }
.contact-link small { display: block; color: var(--text-muted); font-size: .78rem; }
.contact-link strong { font-size: 1rem; }

.contact-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.8rem; display: grid; gap: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.contact-form label { display: grid; gap: .4rem; font-size: .85rem; color: var(--text-muted); font-weight: 500; }
.contact-form input, .contact-form textarea, .contact-form select {
  width: 100%; padding: .78rem .9rem; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); font: inherit; font-size: .97rem; outline: none; transition: border-color .15s;
}
.contact-form select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--text-muted) 50%), linear-gradient(135deg, var(--text-muted) 50%, transparent 50%); background-position: calc(100% - 18px) 55%, calc(100% - 13px) 55%; background-size: 5px 5px; background-repeat: no-repeat; }
.contact-form input:focus, .contact-form textarea:focus, .contact-form select:focus { border-color: var(--accent); }
.contact-form textarea { resize: vertical; }
.form-note { font-size: .78rem; color: var(--text-muted); text-align: center; }

/* ─── Footer ────────────────────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--border); padding: 2.5rem 0; color: var(--text-muted); font-size: .92rem; }
.footer-inner { display: grid; grid-template-columns: auto 1fr auto; gap: 1.5rem; align-items: center; }
.footer-links { display: flex; gap: 1.5rem; }
.footer-links a:hover { color: var(--text); }
.copyright { grid-column: 1 / -1; font-size: .82rem; }

/* ─── Rechtliche Seiten ─────────────────────────────────────────────────── */
.legal { padding: 3rem 0 5rem; max-width: 46rem; }
.legal h1 { font-size: 2.2rem; margin-bottom: 2rem; }
.legal h2 { font-size: 1.3rem; margin: 2rem 0 .8rem; }
.legal p, .legal li { color: var(--text-muted); margin-bottom: .7rem; }
.legal .todo { color: #F5B14C; background: rgba(245,177,76,.1); border: 1px dashed rgba(245,177,76,.5); padding: .2rem .5rem; border-radius: 6px; }

/* ─── Scroll-Reveal ─────────────────────────────────────────────────────── */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .hero { min-height: 0; }
  .bento { grid-template-columns: 1fr; }
  .span-7, .span-5 { grid-column: auto; }
  .steps { grid-template-columns: 1fr; gap: 2rem; }
  .demo-inner, .contact-inner, .about, .faq-inner, .system-inner { grid-template-columns: 1fr; }
  .system-inner { gap: 2.5rem; }
  .demo-frame { height: 700px; }
}
@media (max-width: 760px) {
  .brand-logo { height: 42px; }
  .nav-toggle { display: flex; }
  .nav-links {
    position: fixed; inset: var(--nav-h) 0 auto 0; flex-direction: column; align-items: stretch; gap: 0;
    background: var(--bg-alt); border-bottom: 1px solid var(--border); padding: .5rem 1.25rem 1.25rem;
    transform: translateY(-8px); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
  }
  .nav-links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav-links a:not(.btn) { padding: .9rem 0; border-bottom: 1px solid var(--border); }
  .nav-links .btn { margin-top: 1rem; }
  .nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
  .nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; gap: 1rem; }
  .node.core { width: 100%; }
  .bento-card { padding: 1.5rem; }
}

@media (max-width: 760px) {
  .trust-inner { display: grid; grid-template-columns: 1fr 1fr; gap: .45rem 1rem; text-align: left; font-size: .8rem; }
}

@media (max-width: 520px) {
  .demo-frame { width: 100%; height: 620px; }
  .demo-frame iframe { left: 0; width: 100%; }
}