:root {
  --blue-900: #061b45;
  --blue-800: #0a2a66;
  --blue-700: #103a86;
  --blue-600: #1652b8;
  --blue-500: #2563eb;
  --blue-300: #7aa7f0;
  --accent: #38bdf8;
  --ink: #0f172a;
  --muted: #5b6b80;
  --text: #334155;
  --bg: #ffffff;
  --bg-alt: #f4f7fc;
  --border: #e2e8f0;
  --shadow: 0 10px 30px rgba(10, 42, 102, 0.08);
  --shadow-lg: 0 20px 50px rgba(10, 42, 102, 0.15);
  --radius: 14px;
  --maxw: 1140px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

h1, h2, h3, h4 { color: var(--ink); line-height: 1.2; font-weight: 800; }

a { color: var(--blue-600); text-decoration: none; }

img, svg { display: block; max-width: 100%; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 14px 26px; border-radius: 999px;
  font-weight: 600; font-size: 1rem; cursor: pointer;
  border: 2px solid transparent; transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--blue-600); color: #fff; box-shadow: 0 8px 20px rgba(22, 82, 184, .35); }
.btn-primary:hover { background: var(--blue-700); transform: translateY(-2px); box-shadow: 0 12px 26px rgba(22, 82, 184, .45); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.4); }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-block { width: 100%; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.9); backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); font-size: 1.15rem; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  color: #fff; font-weight: 800; font-size: 1.25rem;
  display: grid; place-items: center; box-shadow: var(--shadow);
}
.brand-text { font-weight: 600; letter-spacing: .2px; }
.brand-text strong { color: var(--blue-600); }

.nav { display: flex; align-items: center; gap: 28px; }
.nav a { color: var(--text); font-weight: 500; font-size: .98rem; }
.nav a:hover { color: var(--blue-600); }
.nav .nav-cta { background: var(--blue-600); color: #fff; padding: 9px 20px; border-radius: 999px; }
.nav .nav-cta:hover { background: var(--blue-700); color: #fff; }

.nav-toggle { display: none; flex-direction: column; gap: 5px; background: none; border: 0; cursor: pointer; padding: 8px; }
.nav-toggle span { width: 24px; height: 2px; background: var(--ink); border-radius: 2px; transition: .25s; }

/* Hero */
.hero { position: relative; color: #fff; overflow: hidden; }
.hero-bg {
  position: absolute; inset: 0;
  background: radial-gradient(1200px 600px at 80% -10%, var(--blue-600) 0%, transparent 60%),
              linear-gradient(135deg, var(--blue-900) 0%, var(--blue-800) 55%, var(--blue-700) 100%);
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 40px 40px; mask-image: radial-gradient(900px 500px at 70% 10%, #000, transparent 75%);
}
.hero-inner { position: relative; padding: 96px 0 110px; }
.hero-content { max-width: 760px; }
.eyebrow {
  text-transform: uppercase; letter-spacing: 2px; font-size: .82rem;
  font-weight: 700; color: var(--accent); margin-bottom: 16px;
}
.eyebrow.light { color: var(--accent); }
.hero h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); color: #fff; letter-spacing: -.5px; }
.hero h1 .accent { color: var(--accent); }
.hero .lead { font-size: clamp(1.05rem, 2vw, 1.25rem); color: rgba(255,255,255,.85); margin: 22px 0 32px; max-width: 640px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
.hero-badges { list-style: none; display: flex; flex-wrap: wrap; gap: 22px; margin-top: 38px; }
.hero-badges li { position: relative; padding-left: 26px; color: rgba(255,255,255,.9); font-weight: 500; font-size: .95rem; }
.hero-badges li::before {
  content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--accent); font-weight: 800;
}

/* Sections */
.section { padding: 88px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { text-align: center; max-width: 680px; margin: 0 auto 54px; }
.section-head h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); margin-top: 6px; }
.section-sub { color: var(--muted); font-size: 1.08rem; margin-top: 14px; }

/* Cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 26px; }
.card {
  position: relative; background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 28px; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: #c9d8f3; }
.card-highlight { border-color: var(--blue-500); box-shadow: 0 14px 40px rgba(37, 99, 235, .18); }
.card-icon {
  width: 56px; height: 56px; border-radius: 14px; margin-bottom: 20px;
  display: grid; place-items: center; color: var(--blue-600);
  background: linear-gradient(135deg, #e8f0ff, #d6e4ff);
}
.card-icon svg { width: 28px; height: 28px; }
.card h3 { font-size: 1.22rem; margin-bottom: 10px; }
.card p { color: var(--text); font-size: .98rem; }
.badge {
  position: absolute; top: 20px; right: 20px;
  background: var(--blue-600); color: #fff; font-size: .72rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1px; padding: 4px 10px; border-radius: 999px;
}

/* Steps */
.steps { list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 26px; counter-reset: step; }
.step { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 26px; position: relative; box-shadow: var(--shadow); }
.step-num {
  display: grid; place-items: center; width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, var(--blue-600), var(--blue-800));
  color: #fff; font-weight: 800; font-size: 1.15rem; margin-bottom: 16px;
}
.step h3 { font-size: 1.12rem; margin-bottom: 8px; }
.step p { font-size: .95rem; color: var(--text); }

/* About */
.about { display: grid; grid-template-columns: 1.3fr 1fr; gap: 56px; align-items: center; }
.about-text h2 { font-size: clamp(1.7rem, 3.2vw, 2.3rem); margin: 6px 0 18px; }
.about-text p { margin-bottom: 16px; color: var(--text); font-size: 1.04rem; }
.about-text .btn { margin-top: 12px; }
.about-stats { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.about-stats li {
  background: var(--bg-alt); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 22px; text-align: center;
}
.about-stats strong { display: block; font-size: 1.7rem; color: var(--blue-600); font-weight: 800; }
.about-stats span { color: var(--muted); font-size: .92rem; }

/* Contact */
.section-contact { background: linear-gradient(135deg, var(--blue-900), var(--blue-800)); color: #fff; }
.contact { display: grid; grid-template-columns: 1fr 1.05fr; gap: 56px; align-items: start; }
.contact-info h2 { color: #fff; font-size: clamp(1.7rem, 3.2vw, 2.3rem); margin: 6px 0 14px; }
.contact-lead { color: rgba(255,255,255,.82); margin-bottom: 30px; font-size: 1.05rem; }
.contact-list { list-style: none; display: grid; gap: 18px; }
.contact-list li { display: flex; align-items: center; gap: 14px; font-size: 1.05rem; }
.contact-list a, .contact-list span { color: #fff; }
.contact-list a:hover { color: var(--accent); }
.contact-ic {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  display: grid; place-items: center; color: var(--accent);
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.15);
}
.contact-ic svg { width: 22px; height: 22px; }

.contact-form { background: #fff; border-radius: 18px; padding: 32px; box-shadow: var(--shadow-lg); }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; color: var(--ink); margin-bottom: 7px; font-size: .92rem; }
.field input, .field textarea {
  width: 100%; padding: 13px 15px; border: 1px solid var(--border); border-radius: 10px;
  font: inherit; color: var(--ink); background: #fbfcfe; transition: border-color .15s, box-shadow .15s;
}
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(37, 99, 235, .15); background: #fff;
}
.field textarea { resize: vertical; }
.form-note { font-size: .82rem; color: var(--muted); margin-top: 14px; text-align: center; }

/* Footer */
.site-footer { background: var(--blue-900); color: rgba(255,255,255,.75); padding-top: 60px; }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-brand .brand-mark { display: inline-grid; }
.footer-brand .brand-text { color: #fff; display: inline-block; margin-left: 8px; vertical-align: middle; }
.footer-brand p { margin-top: 16px; font-size: .95rem; max-width: 280px; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
.footer-col a, .footer-col span { display: block; color: rgba(255,255,255,.72); font-size: .94rem; margin-bottom: 10px; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 22px 24px; text-align: center; font-size: .88rem; }

/* Leistungs-Stichpunkte in den Cards */
.card-list { list-style: none; margin-top: 16px; display: grid; gap: 9px; }
.card-list li { position: relative; padding-left: 24px; font-size: .94rem; color: var(--text); }
.card-list li::before {
  content: ""; position: absolute; left: 0; top: .5em;
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--blue-500); box-shadow: 0 0 0 4px rgba(37,99,235,.12);
}

/* Vorteile */
.benefits { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 24px; }
.benefit {
  display: flex; gap: 16px; align-items: flex-start;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 24px; box-shadow: var(--shadow);
  transition: transform .2s ease, box-shadow .2s ease;
}
.benefit:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.benefit-ic {
  flex: none; width: 50px; height: 50px; border-radius: 12px;
  display: grid; place-items: center; color: var(--blue-600);
  background: linear-gradient(135deg, #e8f0ff, #d6e4ff);
}
.benefit-ic svg { width: 26px; height: 26px; }
.benefit h3 { font-size: 1.1rem; margin-bottom: 6px; }
.benefit p { font-size: .95rem; color: var(--text); }

/* KI-Anwendungsbeispiel */
.usecase { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.usecase-text h2 { font-size: clamp(1.7rem, 3.2vw, 2.3rem); margin: 6px 0 18px; }
.usecase-text p { margin-bottom: 14px; color: var(--text); font-size: 1.04rem; }
.usecase-text .btn { margin-top: 20px; }

.chat {
  background: #fff; border: 1px solid var(--border); border-radius: 18px;
  box-shadow: var(--shadow-lg); overflow: hidden; max-width: 460px; margin: 0 auto; width: 100%;
}
.chat-head {
  display: flex; align-items: center; gap: 10px;
  background: linear-gradient(135deg, var(--blue-800), var(--blue-700));
  color: #fff; padding: 14px 18px;
}
.chat-dot { width: 10px; height: 10px; border-radius: 50%; background: #4ade80; box-shadow: 0 0 0 3px rgba(74,222,128,.25); flex: none; }
.chat-title { font-weight: 600; font-size: .95rem; }
.chat-badge {
  margin-left: auto; font-size: .68rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
  background: rgba(255,255,255,.15); border: 1px solid rgba(255,255,255,.25); color: #fff;
  padding: 3px 9px; border-radius: 999px;
}
.chat-body { padding: 20px 18px; display: grid; gap: 14px; background: #f7f9fc; }
.msg { max-width: 85%; padding: 11px 14px; border-radius: 14px; font-size: .92rem; line-height: 1.5; }
.msg.user {
  justify-self: end; background: var(--blue-600); color: #fff; border-bottom-right-radius: 4px;
}
.msg.bot {
  justify-self: start; background: #fff; color: var(--ink);
  border: 1px solid var(--border); border-bottom-left-radius: 4px;
}
.msg.bot strong { color: var(--blue-700); }
.msg-src { display: block; margin-top: 7px; font-size: .76rem; color: var(--muted); font-style: italic; }
.chat-input {
  padding: 13px 18px; border-top: 1px solid var(--border); background: #fff;
  color: var(--muted); font-size: .9rem;
}

/* Branchen */
.industries { display: grid; grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); gap: 18px; }
.industry {
  display: flex; align-items: center; gap: 14px;
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 18px 20px; box-shadow: var(--shadow);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.industry:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: #c9d8f3; }
.industry-ic {
  flex: none; width: 44px; height: 44px; border-radius: 11px;
  display: grid; place-items: center; color: var(--blue-600);
  background: linear-gradient(135deg, #e8f0ff, #d6e4ff);
}
.industry h3 { font-size: 1rem; font-weight: 600; color: var(--ink); }
.industries-note { text-align: center; margin-top: 30px; color: var(--muted); font-size: 1rem; }

/* FAQ */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 14px; }
.faq details {
  background: #fff; border: 1px solid var(--border); border-radius: 12px;
  padding: 4px 22px; box-shadow: var(--shadow); transition: border-color .2s ease;
}
.faq details[open] { border-color: var(--blue-500); }
.faq summary {
  list-style: none; cursor: pointer; padding: 18px 0;
  font-weight: 600; color: var(--ink); font-size: 1.05rem;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; font-size: 1.5rem; font-weight: 400; color: var(--blue-600);
  line-height: 1; transition: transform .2s ease; flex: none;
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { padding: 0 0 20px; color: var(--text); font-size: .98rem; }

/* Responsive */
@media (max-width: 860px) {
  .nav {
    position: fixed; top: 72px; right: 0; left: 0;
    background: #fff; flex-direction: column; align-items: stretch;
    gap: 0; padding: 12px 24px 24px; border-bottom: 1px solid var(--border);
    transform: translateY(-130%); transition: transform .3s ease; box-shadow: var(--shadow);
  }
  .nav.open { transform: translateY(0); }
  .nav a { padding: 14px 0; border-bottom: 1px solid var(--border); }
  .nav .nav-cta { text-align: center; margin-top: 12px; border-bottom: 0; }
  .nav-toggle { display: flex; }
  .about, .contact, .usecase { grid-template-columns: 1fr; gap: 36px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px) {
  .section { padding: 64px 0; }
  .hero-inner { padding: 72px 0 84px; }
  .about-stats { grid-template-columns: 1fr 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .btn { width: 100%; }
  .hero-actions { flex-direction: column; }
}