/* ==========================================================================
   VOLKS-WERK AG - Corporate Design System
   Modernste Webstandards trifft deutsche Behörden- und Maschinenbau-Ästhetik
   ========================================================================== */

:root {
  /* Konzernfarben */
  --color-bg: #0d1117;
  --color-bg-alt: #161b22;
  --color-bg-card: #1f2630;
  --color-border: #30363d;
  --color-border-glow: #485465;
  
  --color-primary: #e67e22; /* Haptik-Orange */
  --color-primary-glow: rgba(230, 126, 34, 0.35);
  --color-primary-hover: #d35400;
  
  --color-accent-blue: #0070ba; /* Konzern-Blau */
  --color-accent-red: #c0392b;  /* TÜV-Rot */
  --color-accent-green: #27ae60;/* Prüfstands-Grün */
  
  --color-text-main: #f0f6fc;
  --color-text-muted: #8b949e;
  --color-text-retro: #f5deb3;  /* Behörden-Elfenbein */
  
  /* Fonts */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "DIN Alternate", "Trebuchet MS", "Arial Black", sans-serif;
  --font-mono: "Courier New", Courier, "Liberation Mono", monospace;

  /* Spacing */
  --container-max: 1200px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --transition-fast: 0.18s ease;
  --transition-normal: 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  color-scheme: dark;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(230, 126, 34, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(0, 112, 186, 0.04) 0%, transparent 40%);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Typografie */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

h3 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text-main);
}

p {
  margin-bottom: 1rem;
  color: #c9d1d9;
}

.subheadline {
  font-size: 1.2rem;
  color: var(--color-text-muted);
  max-width: 750px;
  margin: 0 auto 2rem auto;
}

.text-center { text-align: center; }
.text-primary { color: var(--color-primary); }
.text-mono { font-family: var(--font-mono); }

/* Badges & Siegel */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  font-weight: bold;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid currentColor;
}

.badge-warning {
  color: #f39c12;
  background-color: rgba(243, 156, 18, 0.12);
  border-color: #f39c12;
}

.badge-success {
  color: #2ecc71;
  background-color: rgba(46, 204, 113, 0.12);
  border-color: #2ecc71;
}

.badge-info {
  color: #3498db;
  background-color: rgba(52, 152, 219, 0.12);
  border-color: #3498db;
}

.badge-danger {
  color: #e74c3c;
  background-color: rgba(231, 76, 60, 0.12);
  border-color: #e74c3c;
}

/* ==========================================================================
   HEADER & NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(13, 17, 23, 0.88);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

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

.brand-wrapper {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: inherit;
}

.brand-logo-img {
  width: 44px;
  height: 44px;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: #ffffff;
}

.brand-claim {
  display: block;
  font-size: 0.65rem;
  font-family: var(--font-mono);
  color: var(--color-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-menu a {
  color: #c9d1d9;
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  transition: color var(--transition-fast);
  padding: 0.4rem 0.2rem;
  position: relative;
}

.nav-menu a:hover {
  color: var(--color-primary);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

/* Audio Toggle Schalter */
.audio-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: #1f2630;
  border: 1px solid #485465;
  color: #f0f6fc;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: bold;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.audio-toggle-btn:hover {
  border-color: var(--color-primary);
}

.audio-toggle-btn.muted {
  opacity: 0.6;
  border-color: #30363d;
}

.vu-light {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #2ecc71;
  box-shadow: 0 0 6px #2ecc71;
  transition: all var(--transition-fast);
}

.audio-toggle-btn.muted .vu-light {
  background-color: #555;
  box-shadow: none;
}

.mobile-nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 2px solid transparent;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #fff;
  box-shadow: 0 4px 14px var(--color-primary-glow);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--color-primary-glow);
}

.btn-secondary {
  background-color: #21262d;
  color: #f0f6fc;
  border-color: #30363d;
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-danger {
  background-color: var(--color-accent-red);
  color: #fff;
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  position: relative;
  padding: 4rem 0 5rem 0;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 3rem;
  align-items: center;
}

.hero-tag {
  display: inline-block;
  margin-bottom: 1rem;
}

.hero-heading {
  margin-bottom: 1.25rem;
}

.hero-heading .brand-highlight {
  color: var(--color-primary);
  display: inline-block;
}

.hero-desc {
  font-size: 1.15rem;
  color: #c9d1d9;
  margin-bottom: 2rem;
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.hero-stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-val {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 900;
  color: var(--color-primary);
}

.stat-lbl {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.hero-visual-wrapper {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-car-stage {
  width: 100%;
  max-width: 650px;
  position: relative;
  animation: gentleFloat 6s ease-in-out infinite;
}

@keyframes gentleFloat {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-8px); }
}

.hero-stage-badge {
  position: absolute;
  top: 10px;
  right: 15px;
}

/* ==========================================================================
   SECTIONS GLOBAL
   ========================================================================== */
.section {
  padding: 5rem 0;
  border-bottom: 1px solid var(--color-border);
}

.section-alt {
  background-color: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 3.5rem auto;
}

.section-title {
  margin-bottom: 0.75rem;
}

/* Grid Layouts */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

/* Cards */
.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 2rem;
  transition: all var(--transition-normal);
  position: relative;
}

.card:hover {
  border-color: var(--color-border-glow);
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.4);
}

.card-icon {
  font-size: 2.4rem;
  margin-bottom: 1.25rem;
  display: inline-block;
}

.card-title {
  margin-bottom: 0.75rem;
  font-size: 1.25rem;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  margin-bottom: 0;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer {
  background-color: #090c10;
  padding: 4rem 0 2rem 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand h4 {
  color: #fff;
  margin-bottom: 0.75rem;
}

.footer-col h5 {
  color: #fff;
  font-family: var(--font-heading);
  margin-bottom: 1.25rem;
  font-size: 1rem;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 0.6rem;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid #21262d;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
}

/* Responsive Media Queries */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-cta-group {
    justify-content: center;
  }
  .hero-stats-strip {
    max-width: 500px;
    margin: 0 auto;
  }
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    width: 100%;
    background-color: var(--color-bg);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--color-border);
  }
  .nav-menu.open {
    display: flex;
  }
  .mobile-nav-toggle {
    display: block;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}