/* ============================================================
   AK Digital Systems — Design-System "C-Light"
   Heller Studio-Look: Off-White-Verlauf, Tinte #0f1a30,
   Blau/Indigo/Violett-Akzente, dunkle Kontrast-Bänder.
============================================================ */

:root {
  --bg: #fafbfd;
  --bg-2: #eef2f7;
  --ink: #0f1a30;
  --ink-soft: #33415e;
  --ink-dim: #5a6b88;
  --primary: #2563eb;
  --indigo: #4f46e5;
  --violet: #9333ea;
  --card: #ffffff;
  --line: #e2e8f2;
  --dark-bg: #0f1a30;
  --dark-ink: #f1f5f9;
  --dark-dim: #8da3c8;
  --dark-line: #24345a;

  --font-head: 'Space Grotesk', 'Inter', sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  --radius: 14px;
  --radius-lg: 22px;
  --max-w: 1140px;
  --section-gap: clamp(4.5rem, 10vw, 8rem);
  --shadow-soft: 0 18px 40px -18px rgba(15, 26, 48, 0.18);
  --shadow-lift: 0 28px 60px -24px rgba(15, 26, 48, 0.28);
  --transition: 0.25s ease;
}

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: linear-gradient(170deg, var(--bg) 0%, var(--bg-2) 100%);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--indigo); }
a:focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 3px; }

img { display: block; max-width: 100%; height: auto; }
ul, ol { list-style: none; }

h1, h2, h3 { font-family: var(--font-head); color: var(--ink); }

/* ---------- 3D-Bühne ---------- */
#scene {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.9s ease;
}
#scene.ready { opacity: 1; }

#scene-fallback {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 6vw;
}
#scene-fallback svg { width: min(46vw, 520px); opacity: 0.5; }
#scene-fallback[hidden] { display: none; }

main, .site-nav, .site-footer { position: relative; z-index: 1; }

/* ---------- Skip-Nav ---------- */
.skip-nav {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--primary);
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 9999;
  transition: top var(--transition);
}
.skip-nav:focus { top: 1rem; color: #fff; }

/* ---------- Layout ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section { padding: var(--section-gap) 0; }

.section-label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 0.875rem;
}

.section-title {
  font-size: clamp(1.9rem, 4.5vw, 2.9rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.12;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.0625rem);
  color: var(--ink-dim);
  max-width: 580px;
}

.section-header { margin-bottom: clamp(2.5rem, 6vw, 4rem); }

.section-dark { background: var(--dark-bg); color: var(--dark-ink); }
.section-dark .section-title { color: #fff; }
.section-dark .section-subtitle { color: var(--dark-dim); }
.section-dark .section-label { color: #7da2e8; }
.section-dark a { color: #93c5fd; }
.section-dark a:hover { color: #fff; }

/* ---------- Navigation ---------- */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 0.875rem 0;
  background: rgba(250, 251, 253, 0.82);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-nav.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 30px -18px rgba(15, 26, 48, 0.25);
}

.nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 1.5rem; }

.nav-logo { display: flex; align-items: center; gap: 0.625rem; }
.nav-logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--dark-bg);
  color: #60a5fa;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.nav-logo-mark svg { width: 22px; height: 22px; }
.nav-logo-text {
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.nav-links { display: none; gap: 1.875rem; align-items: center; }
.nav-links a { font-size: 0.875rem; font-weight: 600; color: var(--ink-dim); }
.nav-links a:hover { color: var(--ink); }

.nav-cta {
  font-size: 0.8125rem;
  font-weight: 600;
  color: #fff;
  background: var(--ink);
  padding: 0.5625rem 1.125rem;
  border-radius: 99px;
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition);
}
.nav-cta:hover { background: var(--primary); color: #fff; transform: translateY(-1px); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.8125rem 1.625rem;
  border-radius: 12px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
}
.btn-primary {
  background: linear-gradient(100deg, var(--primary), var(--indigo));
  color: #fff;
  box-shadow: 0 10px 26px -12px rgba(37, 99, 235, 0.55);
}
.btn-primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 16px 34px -12px rgba(37, 99, 235, 0.6); }
.btn-secondary {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--line);
}
.btn-secondary:hover { border-color: var(--ink-dim); color: var(--ink); transform: translateY(-2px); }

/* ---------- ① Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 7.5rem 0 5rem;
}

.hero-content { max-width: 640px; }

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.25);
  background: rgba(37, 99, 235, 0.06);
  padding: 0.4375rem 0.9375rem;
  border-radius: 99px;
  margin-bottom: 1.75rem;
}

.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1.625rem;
}
.hero h1 .w { display: inline-block; }
.hero h1 .accent {
  background: linear-gradient(100deg, var(--primary), var(--indigo) 55%, var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-lead {
  font-size: clamp(1rem, 2.4vw, 1.1875rem);
  color: var(--ink-dim);
  line-height: 1.7;
  max-width: 540px;
  margin-bottom: 2.5rem;
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 0.875rem; }

.hero-scroll-hint {
  position: absolute;
  bottom: 2.25rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  color: var(--ink-dim);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.scroll-line {
  width: 1px;
  height: 42px;
  background: linear-gradient(to bottom, var(--ink-dim), transparent);
  animation: scroll-line 2.2s ease-in-out infinite;
}
@keyframes scroll-line {
  0%   { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50%  { opacity: 1; transform: scaleY(1); }
  100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}

/* ---------- ② Zahlen-Band ---------- */
.stats { padding: clamp(2.75rem, 6vw, 4rem) 0; }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2rem 1.5rem;
  text-align: center;
}

.stat-value {
  display: block;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #fff;
  line-height: 1.1;
}
.stat-label {
  display: block;
  margin-top: 0.375rem;
  font-size: 0.8125rem;
  color: var(--dark-dim);
}

/* ---------- Cards (gemeinsam) ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-soft);
  border-color: rgba(37, 99, 235, 0.35);
}

/* ---------- ③ Leistungen ---------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.service-card { padding: 1.875rem; }

.service-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(37, 99, 235, 0.08);
  border: 1px solid rgba(37, 99, 235, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
}
.service-icon svg {
  width: 22px;
  height: 22px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.service-card h3 { font-size: 1.125rem; font-weight: 700; margin-bottom: 0.625rem; }
.service-card p { font-size: 0.925rem; color: var(--ink-dim); }

/* ---------- ④ Produkt: mema ---------- */
.product-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  display: grid;
  grid-template-columns: 1fr;
  position: relative;
}
.product-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--indigo), var(--violet));
}

.product-info { padding: clamp(2rem, 5vw, 3.25rem); }

.product-badge {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--primary);
  background: rgba(37, 99, 235, 0.07);
  border: 1px solid rgba(37, 99, 235, 0.22);
  padding: 0.375rem 0.875rem;
  border-radius: 99px;
  margin-bottom: 1.375rem;
}

.product-name {
  font-size: clamp(2.25rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.5rem;
}
.product-tagline {
  font-size: clamp(1rem, 2.2vw, 1.125rem);
  color: var(--primary);
  font-weight: 600;
  margin-bottom: 1.25rem;
}
.product-description {
  font-size: 0.95rem;
  color: var(--ink-dim);
  line-height: 1.75;
  max-width: 520px;
  margin-bottom: 1.5rem;
}

.product-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}
.product-pills li {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--bg-2);
  border: 1px solid var(--line);
  padding: 0.3125rem 0.8125rem;
  border-radius: 99px;
}

.product-visual {
  position: relative;
  background:
    radial-gradient(ellipse 80% 70% at 50% 110%, rgba(37, 99, 235, 0.14), transparent 70%),
    linear-gradient(165deg, #f1f5fb, #e6edf7);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 1.25rem;
  padding: 2.5rem 1.5rem 0;
  min-height: 340px;
  overflow: hidden;
}

.phone-frame {
  width: clamp(130px, 18vw, 170px);
  border: 5px solid var(--ink);
  border-bottom: none;
  border-radius: 26px 26px 0 0;
  overflow: hidden;
  background: var(--ink);
  box-shadow: var(--shadow-lift);
  flex-shrink: 0;
}
.phone-frame img { border-radius: 20px 20px 0 0; }
.phone-back  { transform: translateY(26px); }
.phone-front { transform: translateY(4px); }

/* ---------- ⑤ Person ---------- */
.person-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

.person-photo {
  position: relative;
  max-width: 380px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lift);
}
.person-photo::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15, 26, 48, 0.08);
  pointer-events: none;
}
.person-photo img { width: 100%; }

.person-name {
  font-family: var(--font-head);
  font-size: 1.375rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}
.person-role {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 1.25rem;
}
.person-bio {
  font-size: 0.975rem;
  color: var(--ink-soft);
  line-height: 1.8;
  max-width: 560px;
}

/* ---------- ⑥ Timeline ---------- */
.tl {
  position: relative;
  padding-left: 2rem;
  max-width: 720px;
  display: flex;
  flex-direction: column;
  gap: 2.25rem;
}

.tl-line {
  position: absolute;
  left: 6px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(to bottom, var(--primary), var(--indigo), var(--violet));
  transform-origin: top;
  border-radius: 2px;
}

.tl-item { position: relative; }
.tl-item::before {
  content: '';
  position: absolute;
  left: calc(-2rem + 1px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2.5px solid var(--primary);
}

.tl-year {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 0.3125rem;
}
.tl-item h3 { font-size: 1.0625rem; font-weight: 700; margin-bottom: 0.1875rem; }
.tl-item p { font-size: 0.875rem; color: var(--ink-dim); }

/* ---------- ⑦ Stack ---------- */
.stack-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.stack-card { padding: 1.875rem; }
.stack-card h3 {
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-bottom: 1.125rem;
}
.stack-pills { display: flex; flex-wrap: wrap; gap: 0.5625rem; }
.stack-pills li {
  font-size: 0.84rem;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--bg);
  border: 1px solid var(--line);
  padding: 0.4375rem 0.9375rem;
  border-radius: 99px;
  transition: border-color var(--transition), color var(--transition);
}
.stack-pills li:hover { border-color: var(--primary); color: var(--primary); }

/* ---------- ⑧ Kontakt + Impressum (nebeneinander) ---------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  align-items: start;
}

.contact-main .section-header { margin-bottom: 2rem; }

.contact-cta {
  font-size: clamp(0.875rem, 3.9vw, 1.1875rem);
  padding: 1.0625rem clamp(1rem, 4vw, 1.875rem);
  border-radius: 14px;
  overflow-wrap: anywhere;
}

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem 1.75rem;
  margin-top: 1.5rem;
}
.contact-links a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--dark-dim);
}
.contact-links a:hover { color: #fff; }

.impressum {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--dark-line);
  border-radius: var(--radius-lg);
  padding: 1.875rem;
}
.impressum h2 {
  font-size: 1.0625rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1.25rem;
}
.impressum h3 {
  font-size: 0.71rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dark-dim);
  margin-bottom: 0.625rem;
  line-height: 1.6;
}
.impressum address, .impressum .impressum-mail {
  font-size: 0.875rem;
  color: var(--dark-ink);
  opacity: 0.85;
  line-height: 1.7;
  font-style: normal;
}
.impressum address { margin-bottom: 0.625rem; }
.impressum-note {
  margin-top: 1.25rem;
  padding-top: 1.125rem;
  border-top: 1px solid var(--dark-line);
  font-size: 0.8125rem;
  color: var(--dark-dim);
  line-height: 1.7;
}
.impressum-note summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--dark-ink);
  opacity: 0.85;
}
.impressum-note summary:hover { opacity: 1; }
.impressum-note p { margin-top: 0.75rem; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark-bg);
  border-top: 1px solid var(--dark-line);
  padding: 1.625rem 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.625rem;
  text-align: center;
}
.footer-copy { font-size: 0.8125rem; color: var(--dark-dim); }
.site-footer a { font-size: 0.8125rem; color: var(--dark-dim); }
.site-footer a:hover { color: #fff; }

/* ============================================================
   Responsive
============================================================ */
@media (min-width: 768px) {
  .nav-links { display: flex; }

  .stats-grid { grid-template-columns: repeat(4, 1fr); }

  .services-grid { grid-template-columns: repeat(3, 1fr); }

  .person-grid { grid-template-columns: 380px 1fr; gap: 4rem; }

  .stack-grid { grid-template-columns: repeat(2, 1fr); }

  .footer-inner { flex-direction: row; justify-content: space-between; text-align: left; }
}

@media (min-width: 1024px) {
  .product-card { grid-template-columns: 1.15fr 0.85fr; }
  .product-visual { min-height: 420px; }
  .contact-layout { grid-template-columns: 1.1fr 0.9fr; gap: 4.5rem; }
}

/* ============================================================
   Reduced Motion
============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .scroll-line { animation: none; opacity: 0.5; transform: scaleY(1); }
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}