:root {
  --ink: #0f1722;
  --slate: #1b2735;
  --steel: #475569;
  --line: #e2e8f0;
  --bg: #ffffff;
  --bg-alt: #f5f7fa;
  --accent: #ff6a1a;      /* industrial orange */
  --accent-2: #1d6fe0;    /* technical blue */
  --ok: #16a34a;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 34, 0.08);
  font-family: 'Inter', system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; color: var(--ink); background: var(--bg);
  font-family: 'Inter', system-ui, sans-serif; line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
.container { width: min(1140px, 92vw); margin: 0 auto; }
a { color: inherit; }
h1, h2, h3 { line-height: 1.1; letter-spacing: -0.02em; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 70px; }
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 800; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 7px;
  background: linear-gradient(135deg, var(--accent), #ff9248);
  position: relative; flex: none;
}
.logo-mark::after {
  content: ""; position: absolute; inset: 8px 6px; border-radius: 2px;
  background: repeating-linear-gradient(90deg, #fff 0 3px, transparent 3px 6px);
}
.logo-text { font-size: 19px; letter-spacing: 0.02em; line-height: 1; }
.logo-text small { display: block; font-size: 11px; font-weight: 600; color: var(--steel); letter-spacing: 0.18em; text-transform: uppercase; }
.nav { display: flex; align-items: center; gap: 28px; }
.nav a { text-decoration: none; font-weight: 600; font-size: 15px; color: var(--steel); }
.nav a:hover { color: var(--ink); }
.nav-cta { background: var(--ink); color: #fff !important; padding: 9px 18px; border-radius: 9px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block; font-weight: 700; font-size: 16px; text-decoration: none;
  padding: 14px 26px; border-radius: 10px; border: 2px solid transparent; cursor: pointer;
  transition: transform .08s ease, box-shadow .15s ease;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 8px 22px rgba(255,106,26,0.32); }
.btn-primary:hover { box-shadow: 0 10px 28px rgba(255,106,26,0.42); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--steel); }
.btn-block { width: 100%; font-size: 17px; }

/* ---------- Hero ---------- */
.hero {
  background: radial-gradient(1100px 500px at 80% -10%, rgba(29,111,224,0.10), transparent 60%),
              linear-gradient(180deg, #fff, var(--bg-alt));
  border-bottom: 1px solid var(--line);
}
.hero-inner { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 48px; align-items: center; padding: 84px 0; }
.eyebrow { font-size: 13px; font-weight: 700; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-2); }
.hero h1 { font-size: clamp(40px, 6vw, 68px); font-weight: 800; margin: 14px 0 18px; }
.lead { font-size: 20px; color: var(--steel); max-width: 30em; margin: 0 0 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { display: flex; gap: 38px; margin-top: 46px; flex-wrap: wrap; }
.hero-stats strong { display: block; font-size: 26px; font-weight: 800; }
.hero-stats span { font-size: 14px; color: var(--steel); }

.hero-art {
  height: 320px; border-radius: var(--radius); background: var(--slate);
  box-shadow: var(--shadow); position: relative; overflow: hidden;
  display: flex; align-items: center; justify-content: center;
}
.hero-art::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(600px 200px at 50% 120%, rgba(255,106,26,0.25), transparent 60%);
}
.belt { display: flex; gap: 16px; transform: rotate(-8deg); }
.belt span {
  width: 46px; height: 64px; border-radius: 8px;
  background: linear-gradient(180deg, #cdd7e3, #8595a8);
  box-shadow: inset 0 -6px 0 rgba(0,0,0,0.18);
  animation: roll 2.2s linear infinite;
}
.belt span:nth-child(odd) { background: linear-gradient(180deg, #ff8d4e, var(--accent)); }
.belt span:nth-child(2) { animation-delay: -.3s; }
.belt span:nth-child(3) { animation-delay: -.6s; }
.belt span:nth-child(4) { animation-delay: -.9s; }
.belt span:nth-child(5) { animation-delay: -1.2s; }
.belt span:nth-child(6) { animation-delay: -1.5s; }
@keyframes roll { 0% { transform: translateY(0); } 50% { transform: translateY(-10px); } 100% { transform: translateY(0); } }

/* ---------- Sections ---------- */
.section { padding: 78px 0; }
.section-alt { background: var(--bg-alt); border-block: 1px solid var(--line); }
.section-dark { background: var(--ink); color: #fff; }
.section-title { font-size: clamp(28px, 4vw, 40px); font-weight: 800; margin: 0; }
.section-sub { font-size: 18px; color: var(--steel); margin: 12px 0 0; }
.section-dark .section-sub { color: #b9c4d3; }

/* ---------- Cards ---------- */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; margin-top: 42px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--shadow); }
.card h3 { font-size: 19px; margin: 16px 0 8px; }
.card p { color: var(--steel); font-size: 15px; margin: 0; }
.card-ico { width: 46px; height: 46px; border-radius: 11px; background: var(--bg-alt); position: relative; }
.card-ico::after { content: ""; position: absolute; inset: 12px; border-radius: 4px; background: var(--accent); opacity: 0.9; }
.ico-ctrl::after { background: var(--accent-2); border-radius: 50%; }
.ico-iot::after { background: var(--ok); clip-path: polygon(50% 0, 100% 100%, 0 100%); }
.ico-service::after { background: var(--slate); border-radius: 3px; transform: rotate(45deg); }

/* ---------- Calculator ---------- */
.calc-wrap { display: grid; grid-template-columns: 1fr 0.9fr; gap: 56px; align-items: center; }
.calc-points { list-style: none; padding: 0; margin: 24px 0 0; }
.calc-points li { position: relative; padding-left: 28px; margin-bottom: 10px; color: var(--steel); }
.calc-points li::before { content: ""; position: absolute; left: 0; top: 8px; width: 14px; height: 8px; border-left: 3px solid var(--accent); border-bottom: 3px solid var(--accent); transform: rotate(-45deg); }
.calc-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 30px; box-shadow: var(--shadow); }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 7px; }
.input-unit { display: flex; align-items: center; border: 1.5px solid var(--line); border-radius: 10px; overflow: hidden; }
.input-unit input { flex: 1; border: 0; padding: 13px 14px; font-size: 17px; font-family: inherit; outline: none; }
.input-unit .unit { padding: 0 16px; color: var(--steel); font-weight: 600; background: var(--bg-alt); align-self: stretch; display: flex; align-items: center; }
select { width: 100%; padding: 13px 14px; font-size: 16px; font-family: inherit; border: 1.5px solid var(--line); border-radius: 10px; background: #fff; }
.result { margin-top: 22px; padding: 22px; border-radius: 12px; background: var(--ink); color: #fff; text-align: center; }
.result-label { display: block; font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: #9fb0c4; }
.result-value { display: block; font-size: 40px; font-weight: 800; margin: 6px 0; letter-spacing: -0.02em; }
.result-note { display: block; font-size: 12px; color: #9fb0c4; }

/* ---------- Referenzen ---------- */
.quote { max-width: 760px; margin: 36px auto 0; text-align: center; }
.quote blockquote { font-size: 24px; font-weight: 600; line-height: 1.4; margin: 0; letter-spacing: -0.01em; }
.quote cite { display: block; margin-top: 16px; color: var(--steel); font-style: normal; font-weight: 600; }
.logos-row { display: flex; flex-wrap: wrap; gap: 14px 34px; justify-content: center; margin-top: 44px; }
.logos-row span { color: var(--steel); font-weight: 700; letter-spacing: 0.04em; opacity: 0.7; }

/* ---------- Kontakt ---------- */
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.contact-card { background: #11203a; border: 1px solid #22344f; border-radius: var(--radius); padding: 28px; }
.contact-card a { color: #ffb483; }
.contact-card .muted { color: #8aa0bd; font-size: 14px; }

/* ---------- Footer ---------- */
.site-footer { background: #0a121e; color: #8aa0bd; padding: 26px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; font-size: 14px; flex-wrap: wrap; gap: 10px; }
.footer-meta { opacity: 0.8; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .nav { gap: 16px; }
  .nav a:not(.nav-cta) { display: none; }
  .hero-inner { grid-template-columns: 1fr; }
  .hero-art { order: -1; height: 220px; }
  .cards { grid-template-columns: 1fr 1fr; }
  .calc-wrap { grid-template-columns: 1fr; gap: 32px; }
  .contact-inner { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .cards { grid-template-columns: 1fr; }
  .hero-stats { gap: 24px; }
}