/* AdronTec Website — Production Stylesheet
   Swiss Modernism 2.0: Grid, Inter, single accent, clean hierarchy.
   Design-Tokens als CSS Custom Properties.
   Responsive: 640 / 768 / 1024 / 1280px */

/* ============================================
   Design Tokens
   ============================================ */
:root {
  --ext-bg: #ffffff;
  --ext-surface: #f8f9fb;
  --ext-surface-alt: #eef1f6;
  --ext-border: #d8dde6;
  --ext-text: #1a2332;
  --ext-text-secondary: #556270;
  --ext-text-muted: #8b95a5;
  --ext-accent: #0077cc;
  --ext-accent-hover: #005fa3;
  --ext-accent-light: #e6f2ff;
  --ext-dark: #1a2332;
  --ext-dark-surface: #243044;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1200px;
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ext-text);
  background: var(--ext-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--ext-accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--ext-accent-hover); }

/* Focus Styles (Accessibility) */
:focus-visible {
  outline: 2px solid var(--ext-accent);
  outline-offset: 2px;
}

/* Focus on dark backgrounds (B3) */
.hero :focus-visible,
.cta :focus-visible,
.page-hero :focus-visible,
.footer :focus-visible {
  outline-color: #ffffff;
}

/* Skip Link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  background: var(--ext-accent);
  color: #fff;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 200;
}
.skip-link:focus {
  top: 8px;
  color: #fff;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; }
h1 { font-size: 3rem; letter-spacing: -0.02em; }
h2 { font-size: 1.875rem; }
h3 { font-size: 1.25rem; font-weight: 600; }

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

.section { padding: 80px 0; }

.section-header {
  text-align: center;
  margin-bottom: 48px;
}
.section-header h2 { color: var(--ext-text); margin-bottom: 12px; }
.section-header p {
  color: var(--ext-text-secondary);
  font-size: 1.125rem;
  max-width: 560px;
  margin: 0 auto;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  padding: 14px 28px;
  min-height: 48px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  text-align: center;
  white-space: nowrap;
}

.btn-sm { font-size: 0.9375rem; padding: 10px 24px; min-height: 40px; }

.btn-primary {
  background: var(--ext-accent);
  color: #ffffff;
  border-color: var(--ext-accent);
}
.btn-primary:hover {
  background: var(--ext-accent-hover);
  border-color: var(--ext-accent-hover);
  color: #ffffff;
}

.btn-ghost {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255,255,255,0.4);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.1);
  border-color: #ffffff;
  color: #ffffff;
}

.btn-white {
  background: #ffffff;
  color: var(--ext-accent);
  border-color: #ffffff;
}
.btn-white:hover {
  background: var(--ext-accent-light);
  border-color: var(--ext-accent-light);
  color: var(--ext-accent-hover);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--ext-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}
.nav-logo:hover { color: var(--ext-text); }

.nav-logo-bar {
  width: 4px;
  height: 28px;
  background: var(--ext-accent);
  border-radius: 1.5px;
}

.nav-logo-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ext-text);
  letter-spacing: 0.08em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--ext-text-secondary);
  transition: color var(--transition);
}
.nav-links a:hover { color: var(--ext-text); }
.nav-links a[aria-current="page"] {
  color: var(--ext-accent);
  box-shadow: inset 0 -2px 0 var(--ext-accent);
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}
.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--ext-text);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}
.nav-state { display: none; }

/* ============================================
   Hero
   ============================================ */
.hero {
  background: var(--ext-dark);
  display: flex;
  align-items: center;
  min-height: 55vh;
  padding: 96px 0;
}

.hero-content { max-width: 860px; }

.hero h1 {
  color: #ffffff;
  font-size: 3.25rem;
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 1.3125rem;
  line-height: 1.7;
  color: rgba(255,255,255,0.75);
  margin-bottom: 40px;
  max-width: 720px;
}

.hero-actions {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

/* ============================================
   Intro (Kurzvorstellung)
   ============================================ */
.intro { background: var(--ext-surface); }

.intro-content {
  max-width: 820px;
  border-left: 3px solid var(--ext-accent);
  padding-left: 24px;
}

.intro-content h2 {
  color: var(--ext-text);
  font-size: 2rem;
  margin-bottom: 16px;
}

.intro-lead {
  font-size: 1.3125rem;
  font-weight: 500;
  color: var(--ext-text);
  line-height: 1.7;
  margin-bottom: 16px;
}

.intro-content p {
  color: var(--ext-text-secondary);
  font-size: 1.125rem;
  line-height: 1.7;
}

/* ============================================
   Service Cards
   ============================================ */
.services { background: var(--ext-bg); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--ext-bg);
  border: 1px solid var(--ext-border);
  border-radius: var(--radius-md);
  padding: 36px;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.card:hover {
  border-color: var(--ext-accent);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.card-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 20px;
  color: var(--ext-accent);
}

.card h3 { color: var(--ext-text); font-size: 1.375rem; margin-bottom: 12px; }
.card p { color: var(--ext-text-secondary); font-size: 1.0625rem; line-height: 1.6; }

/* ============================================
   Arguments (Why Us)
   ============================================ */
.arguments { background: var(--ext-surface); }

.args-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}

.arg-item { padding: 32px; }

.arg-icon {
  width: 44px;
  height: 44px;
  color: var(--ext-accent);
  margin-bottom: 20px;
}

.arg-item h3 { color: var(--ext-text); font-size: 1.375rem; margin-bottom: 10px; }
.arg-item p { color: var(--ext-text-secondary); font-size: 1.0625rem; line-height: 1.6; }

/* ============================================
   CTA Section
   ============================================ */
.cta {
  background: var(--ext-dark);
  text-align: center;
  padding: 96px 0;
}
.cta h2 { color: #ffffff; font-size: 2.5rem; margin-bottom: 20px; }
.cta p {
  color: rgba(255,255,255,0.75);
  font-size: 1.25rem;
  margin-bottom: 40px;
  max-width: 540px;
  margin-left: auto;
  margin-right: auto;
}
.cta-actions {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */
.footer {
  background: var(--ext-dark);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 64px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}

.footer-brand p {
  color: rgba(255,255,255,0.65);
  font-size: 1rem;
  margin-top: 12px;
  line-height: 1.6;
}

.footer-logo-wrap { height: 44px; }

.footer h4 {
  color: rgba(255,255,255,0.9);
  font-size: 0.9375rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.footer-nav { list-style: none; }
.footer-nav li { margin-bottom: 10px; }
.footer-nav a {
  color: rgba(255,255,255,0.6);
  font-size: 1rem;
  transition: color var(--transition);
}
.footer-nav a:hover { color: rgba(255,255,255,0.9); }

.footer-contact p,
.footer-contact a {
  color: rgba(255,255,255,0.6);
  font-size: 1rem;
  display: block;
  margin-bottom: 6px;
}
.footer-contact a:hover { color: rgba(255,255,255,0.9); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-bottom p { color: rgba(255,255,255,0.4); font-size: 0.9375rem; }
.footer-legal { display: flex; gap: 24px; }
.footer-legal a {
  color: rgba(255,255,255,0.4);
  font-size: 0.9375rem;
  transition: color var(--transition);
}
.footer-legal a:hover { color: rgba(255,255,255,0.8); }

/* ============================================
   Page Hero (Subpages)
   ============================================ */
.page-hero {
  background: var(--ext-dark);
  padding: 72px 0;
}
.page-hero h1 {
  color: #ffffff;
  margin-bottom: 12px;
}
.page-hero p {
  font-size: 1.125rem;
  color: rgba(255,255,255,0.7);
  max-width: 560px;
}

/* ============================================
   Service Detail Cards (Leistungsseite)
   ============================================ */
.service-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--ext-bg);
  border: 1px solid var(--ext-border);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.service-card:hover {
  border-color: var(--ext-accent);
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
}

.service-card h3 { color: var(--ext-text); margin-bottom: 8px; }

.service-lead {
  color: var(--ext-text-secondary);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 16px;
}

.service-points {
  list-style: none;
  margin-bottom: 16px;
}
.service-points li {
  color: var(--ext-text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  padding-left: 16px;
  position: relative;
  margin-bottom: 6px;
}
.service-points li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 9px;
  width: 6px;
  height: 6px;
  background: var(--ext-accent);
  border-radius: 50%;
}

.service-usecase {
  font-size: 0.8125rem;
  color: var(--ext-text-muted);
  font-style: italic;
  padding-top: 12px;
  border-top: 1px solid var(--ext-border);
}

/* ============================================
   Approach Grid (Arbeitsweise)
   ============================================ */
.approach { background: var(--ext-surface); }

.approach-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 32px;
}
.approach-item { padding: 24px; }
.approach-item h3 { color: var(--ext-text); margin-bottom: 8px; }
.approach-item p { color: var(--ext-text-secondary); font-size: 0.9375rem; line-height: 1.6; }

/* ============================================
   Audience (Für wen)
   ============================================ */
.audience { background: var(--ext-bg); }

/* ============================================
   Contact Grid (Kontaktseite)
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.contact-block h3 {
  color: var(--ext-text);
  margin-bottom: 12px;
}

.contact-value {
  display: block;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--ext-accent);
  margin-bottom: 8px;
}
a.contact-value:hover { color: var(--ext-accent-hover); }

.contact-block p {
  color: var(--ext-text-secondary);
  font-size: 0.9375rem;
}

/* ============================================
   Team Section
   ============================================ */
.team-section { background: var(--ext-surface); }

/* ============================================
   Legal Pages (Impressum, Datenschutz)
   ============================================ */
.legal-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 80px 24px;
}
.legal-page h1 { margin-bottom: 32px; }
.legal-page h2 { font-size: 1.25rem; margin: 24px 0 8px; }
.legal-meta {
  margin-top: 32px;
  color: var(--ext-text-muted);
  font-size: 0.875rem;
}
.footer-minimal { padding: 24px 0; }
.footer-minimal .footer-bottom { border-top: none; padding-top: 0; }

/* ============================================
   Responsive — max 1024px
   ============================================ */
@media (max-width: 1024px) {
  .card-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
}

/* ============================================
   Responsive — max 768px
   ============================================ */
@media (max-width: 768px) {
  .section { padding: 56px 0; }
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.5rem; }

  /* Mobile Navigation */
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--ext-bg);
    border-bottom: 1px solid var(--ext-border);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition), opacity var(--transition);
  }

  .nav-state:checked ~ .nav-inner .nav-links {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav-state:checked ~ .nav-inner .nav-toggle span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  .nav-state:checked ~ .nav-inner .nav-toggle span:nth-child(2) { opacity: 0; }
  .nav-state:checked ~ .nav-inner .nav-toggle span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
  }

  .card-grid { grid-template-columns: 1fr; }
  .args-grid { grid-template-columns: 1fr; gap: 16px; }
  .arg-item { padding: 20px 0; }

  .footer-grid { grid-template-columns: 1fr; gap: 32px; }

  .hero { min-height: auto; padding: 56px 0; }
  .hero-sub { font-size: 1.0625rem; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .cta-actions { flex-direction: column; align-items: center; }
  .cta-actions .btn { width: 100%; max-width: 320px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }

  .service-grid { grid-template-columns: 1fr; }
  .approach-grid { grid-template-columns: 1fr; gap: 16px; }
  .approach-item { padding: 20px 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 24px; }
  .page-hero { padding: 48px 0; }
  .legal-page { padding: 56px 24px; }
}

/* ============================================
   Responsive — max 640px
   ============================================ */
@media (max-width: 640px) {
  .container { padding: 0 16px; }
  h1 { font-size: 2rem; }
  .card { padding: 24px; }
  .section { padding: 40px 0; }
  .service-card { padding: 24px; }
  .legal-page { padding: 40px 16px; }
}