/* =========================================================================
   S Ingenieurbuero -- style.css (Premium-Redesign)
   Farbwelt: Dunkelblau (Navy), Stahlgrau, Weiss, dezenter Akzent (Logo-Gruen)
   Typografie: Plus Jakarta Sans (Headlines) + Inter (Fliesstext)
   Hinweis: Google Fonts wird per <link> in den HTML-Dateien geladen.
   Bei fehlender Internetverbindung greift automatisch der System-Font-Stack.
   ========================================================================= */

:root {
  /* Grundfarben */
  --color-white: #ffffff;
  --color-bg-alt: #f4f6f8;          /* helles Stahlgrau fuer Sektionswechsel */
  --color-navy: #0e2438;            /* Dunkelblau, Hauptfarbe */
  --color-navy-2: #14344f;          /* helleres Navy fuer Verlaeufe */
  --color-navy-deep: #081420;       /* sehr dunkles Navy fuer Hero/Footer */
  --color-anthracite: #262b31;      /* Anthrazit, Fliesstext */
  --color-steel: #5b6670;           /* Stahlgrau, Sekundaertext */
  --color-steel-light: #8c96a0;     /* helleres Stahlgrau */
  --color-border: #e1e5ea;          /* feine technische Linien */
  --color-accent: #1f9d7c;          /* dezentes Gruen, passend zum Logo */
  --color-accent-dark: #167a61;
  --color-accent-soft: rgba(31, 157, 124, 0.12);

  --font-display: "Plus Jakarta Sans", "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Arial, sans-serif;
  --font-sans: "Inter", "Segoe UI", -apple-system, BlinkMacSystemFont, Roboto, Arial, sans-serif;

  --max-width: 1200px;
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 3px rgba(14, 36, 56, 0.06);
  --shadow-card: 0 4px 20px rgba(14, 36, 56, 0.07);
  --shadow-card-hover: 0 18px 44px rgba(14, 36, 56, 0.14);
  --shadow-float: 0 12px 40px rgba(8, 20, 32, 0.14);
  --transition: 220ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 480ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* =========================================================================
   Reset & Basis
   ========================================================================= */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-anthracite);
  background: var(--color-white);
  line-height: 1.68;
  font-size: 16.5px;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; margin: 0; padding: 0; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-navy);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0 0 0.6em 0;
}

h1 { font-size: clamp(2.4rem, 5vw, 4.2rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.8rem, 3.4vw, 2.6rem); }
h3 { font-size: 1.22rem; font-weight: 650; }

p { margin: 0 0 1em 0; color: var(--color-steel); }

section { padding: 128px 0; position: relative; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 28px;
}

.section-header {
  max-width: 720px;
  margin: 0 0 64px 0;
}

.section-header .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  font-weight: 700;
  margin-bottom: 16px;
}

.section-header .eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--color-accent);
  display: inline-block;
}

.section-header h2 { margin-bottom: 14px; }
.section-header p { font-size: 1.05rem; max-width: 640px; }

.section-alt {
  background: var(--color-bg-alt);
  background-image:
    linear-gradient(rgba(14,36,56,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,36,56,0.035) 1px, transparent 1px);
  background-size: 46px 46px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* Keyboard focus visibility (Barrierefreiheit) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* =========================================================================
   Buttons
   ========================================================================= */
.btn {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 16px 34px;
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 650;
  letter-spacing: -0.005em;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-navy) 0%, var(--color-navy-2) 100%);
  color: var(--color-white);
  border-color: var(--color-navy);
  box-shadow: 0 8px 24px rgba(14, 36, 56, 0.22);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(14, 36, 56, 0.3);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-border);
}
.btn-outline:hover {
  border-color: var(--color-navy);
  transform: translateY(-2px);
}

.btn-block { width: 100%; }

/* Ripple-Effekt (per JavaScript ausgeloest, siehe script.js) */
.btn .ripple {
  position: absolute;
  border-radius: 50%;
  transform: scale(0);
  background: rgba(255, 255, 255, 0.45);
  pointer-events: none;
  animation: ripple-anim 620ms ease-out;
}

.btn-outline .ripple { background: rgba(14, 36, 56, 0.12); }

@keyframes ripple-anim {
  to {
    transform: scale(2.6);
    opacity: 0;
  }
}

/* =========================================================================
   Header / Floating Sticky Navigation
   ========================================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: 20px 24px 0;
  pointer-events: none;
  transition: padding var(--transition-slow);
}

.site-header.is-scrolled { padding-top: 10px; }

.header-inner {
  pointer-events: auto;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 16px 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 86px;
  background: rgba(255, 255, 255, 0.86);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border: 1px solid rgba(14, 36, 56, 0.06);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-float);
  transition: height var(--transition-slow), box-shadow var(--transition-slow), background var(--transition-slow);
}

.site-header.is-scrolled .header-inner {
  height: 70px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 8px 28px rgba(8, 20, 32, 0.16);
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand img.logo {
  height: 52px;
  width: auto;
  transition: height var(--transition-slow);
}

.site-header.is-scrolled .brand img.logo { height: 42px; }

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-navy);
  font-size: 1.08rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

/* "S" und "Ingenieurbüro" sind zwei separate Spans (kein Leerzeichen im
   Markup dazwischen), damit bei gestapelter Mobil-Ansicht kein
   anonymes Flex-Textelement entsteht. Der sichtbare Abstand auf dem
   Desktop kommt stattdessen von diesem margin-right. */
.brand-name-mark { margin-right: 0.32em; }
.brand-name-full { }

.main-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.main-nav ul {
  display: flex;
  align-items: center;
  gap: 2px;
}

.main-nav a.nav-link {
  position: relative;
  padding: 11px 16px;
  font-family: var(--font-display);
  font-size: 0.94rem;
  font-weight: 550;
  color: var(--color-anthracite);
  border-radius: 999px;
  transition: color var(--transition), background var(--transition);
}

.main-nav a.nav-link::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 6px;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.main-nav a.nav-link:hover {
  color: var(--color-navy);
  background: rgba(14, 36, 56, 0.05);
}

.main-nav a.nav-link:hover::after,
.main-nav a.nav-link.is-active::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Sprachschalter */
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  overflow: hidden;
  padding: 3px;
  background: var(--color-white);
}

.lang-switch button {
  background: transparent;
  border: none;
  border-radius: 999px;
  padding: 7px 14px;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-steel);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
}

.lang-switch button.active {
  background: var(--color-navy);
  color: var(--color-white);
}

.lang-switch button:not(.active):hover {
  color: var(--color-navy);
}

/* Mobiles Menue Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  height: 2px;
  width: 18px;
  margin: 0 auto;
  background: var(--color-navy);
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =========================================================================
   Hero -- Premium mit Blueprint-Overlay
   ========================================================================= */
.hero {
  position: relative;
  margin-top: -106px;
  padding: 232px 0 140px;
  background:
    radial-gradient(ellipse 900px 500px at 82% 8%, rgba(31,157,124,0.16), transparent 60%),
    linear-gradient(160deg, var(--color-navy-deep) 0%, var(--color-navy) 48%, var(--color-navy-2) 100%);
  color: var(--color-white);
  overflow: hidden;
  isolation: isolate;
}

/* feines technisches Grundraster */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.55;
  background-image:
    linear-gradient(rgba(255,255,255,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.05) 1px, transparent 1px);
  background-size: 52px 52px;
  mask-image: radial-gradient(ellipse at 68% 35%, black 5%, transparent 72%);
}

.hero-bg::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(31,157,124,0.14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31,157,124,0.14) 1px, transparent 1px);
  background-size: 260px 260px;
}

/* Blueprint-Konturen (dezente Konstruktionslinien, CAD-inspiriert) */
.hero-blueprint {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.5;
}

.hero-blueprint svg { width: 100%; height: 100%; }

.hero-vignette {
  position: absolute;
  inset: 0;
  z-index: 0;
  background: linear-gradient(180deg, rgba(8,20,32,0.15) 0%, rgba(8,20,32,0.55) 100%);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 720px;
}

.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-white);
  opacity: 0.75;
  font-weight: 700;
  margin-bottom: 24px;
}

.hero .eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--color-accent);
}

.hero h1 {
  color: var(--color-white);
  margin-bottom: 24px;
  animation: hero-rise 900ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

.hero .subtitle {
  color: rgba(255,255,255,0.82);
  font-size: 1.18rem;
  max-width: 580px;
  margin-bottom: 40px;
  animation: hero-rise 900ms cubic-bezier(0.16, 1, 0.3, 1) 120ms both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 40px;
  animation: hero-rise 900ms cubic-bezier(0.16, 1, 0.3, 1) 220ms both;
}

@keyframes hero-rise {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: translateY(0); }
}

.hero .btn-outline {
  color: var(--color-white);
  border-color: rgba(255,255,255,0.32);
}
.hero .btn-outline:hover { border-color: var(--color-white); background: rgba(255,255,255,0.08); }
.hero .btn-outline .ripple { background: rgba(255,255,255,0.35); }

/* Bewusst kein gruener Button im Hero -- stattdessen ein heller,
   kontrastreicher Button (Weiss auf Navy), Akzentfarbe bleibt dezenten
   Details (Bullets, Linien, Icons) vorbehalten. */
.hero .btn-primary {
  background: var(--color-white);
  color: var(--color-navy);
  border-color: var(--color-white);
  box-shadow: 0 10px 30px rgba(0,0,0,0.28);
}
.hero .btn-primary:hover {
  background: #edf1f4;
  box-shadow: 0 16px 38px rgba(0,0,0,0.32);
}
.hero .btn-primary .ripple { background: rgba(14,36,56,0.18); }

.hero-tagline {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 22px;
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  color: rgba(255,255,255,0.65);
  animation: hero-rise 900ms cubic-bezier(0.16, 1, 0.3, 1) 320ms both;
}

.hero-tagline span { position: relative; padding-left: 18px; }
.hero-tagline span::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--color-accent);
}
.hero-tagline span:first-child { padding-left: 0; }
.hero-tagline span:first-child::before { display: none; }

/* =========================================================================
   Ueber uns -- zweispaltig mit Illustration
   ========================================================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 72px;
  align-items: center;
}

.about-text p:last-child { margin-bottom: 0; }
.about-text p { font-size: 1.04rem; color: var(--color-anthracite); }

.about-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.fact-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 22px 20px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.fact-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
  border-color: var(--color-accent);
}

.fact-card .fact-label {
  font-size: 0.78rem;
  color: var(--color-steel);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  font-weight: 600;
}

.fact-card .fact-value {
  font-family: var(--font-display);
  font-size: 0.76rem;
  color: var(--color-navy);
  font-weight: 700;
  margin-top: 8px;
  overflow-wrap: break-word;
  word-break: break-word;
  hyphens: none;
}

/* Illustration: rein grafisch, CAD-/Blueprint-inspiriert (kein Stockfoto) */
.about-visual {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-2) 100%);
  overflow: hidden;
  box-shadow: var(--shadow-card-hover);
}

.about-visual .grid-overlay {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.08) 1px, transparent 1px);
  background-size: 34px 34px;
  opacity: 0.7;
}

.about-visual svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.about-visual .visual-badge {
  position: absolute;
  bottom: 24px;
  left: 24px;
  right: 24px;
  background: rgba(8, 20, 32, 0.55);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: var(--radius);
  padding: 16px 18px;
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* =========================================================================
   Leistungen (Services) -- Premium-Cards
   ========================================================================= */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 28px;
}

.service-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 36px 32px;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition);
  overflow: hidden;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-navy));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.service-card:hover {
  transform: translateY(-6px);
  border-color: transparent;
  box-shadow: var(--shadow-card-hover);
}

.service-card:hover::before { transform: scaleX(1); }

.service-card .service-icon {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-soft);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  transition: background var(--transition), color var(--transition), transform var(--transition);
}

.service-card .service-icon svg { width: 28px; height: 28px; }

.service-card:hover .service-icon {
  background: var(--color-navy);
  color: var(--color-white);
  transform: scale(1.06);
}

.service-card .service-index {
  position: absolute;
  top: 32px;
  right: 32px;
  font-family: var(--font-display);
  font-size: 0.78rem;
  color: var(--color-steel-light);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.service-card h3 { margin-bottom: 14px; padding-right: 30px; }

.service-card ul {
  margin-top: 6px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.service-card li {
  position: relative;
  padding-left: 20px;
  font-size: 0.95rem;
  color: var(--color-steel);
  line-height: 1.55;
}

.service-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
}

/* =========================================================================
   Branchen (Industries)
   ========================================================================= */
.industries-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 14px;
}

.industry-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 20px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--color-anthracite);
  line-height: 1.35;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.industry-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-sm);
}

.industry-item .industry-icon {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--color-accent-soft);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
  /* dezente, fortlaufende Bewegung -- pro Kachel leicht versetzt, damit es
     lebendig statt unruhig wirkt */
  animation: industry-icon-breathe 4.2s ease-in-out infinite;
}

.industry-item .industry-icon svg { width: 17px; height: 17px; }

.industry-item:hover .industry-icon {
  background: var(--color-navy);
  color: var(--color-white);
}

@keyframes industry-icon-breathe {
  0%, 100% { transform: scale(1) rotate(0deg); }
  50% { transform: scale(1.1) rotate(4deg); }
}

.industry-item:nth-child(1) .industry-icon { animation-delay: 0s; }
.industry-item:nth-child(2) .industry-icon { animation-delay: 0.35s; }
.industry-item:nth-child(3) .industry-icon { animation-delay: 0.7s; }
.industry-item:nth-child(4) .industry-icon { animation-delay: 1.05s; }
.industry-item:nth-child(5) .industry-icon { animation-delay: 1.4s; }
.industry-item:nth-child(6) .industry-icon { animation-delay: 1.75s; }
.industry-item:nth-child(7) .industry-icon { animation-delay: 2.1s; }
.industry-item:nth-child(8) .industry-icon { animation-delay: 2.45s; }
.industry-item:nth-child(9) .industry-icon { animation-delay: 2.8s; }
.industry-item:nth-child(10) .industry-icon { animation-delay: 3.15s; }
.industry-item:nth-child(11) .industry-icon { animation-delay: 3.5s; }

/* =========================================================================
   Arbeitsweise -- horizontale Timeline
   ========================================================================= */
.process-list {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 18px;
  position: relative;
  padding-top: 8px;
}

.process-list::before {
  content: "";
  position: absolute;
  top: 34px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--color-border) 0 10px, transparent 10px 18px);
  z-index: 0;
}

.process-step {
  position: relative;
  z-index: 1;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 30px 22px 26px;
  text-align: left;
  transition: transform var(--transition-slow), box-shadow var(--transition-slow), border-color var(--transition);
}

.process-step:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.process-step .step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-navy);
  color: var(--color-white);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.98rem;
  margin-bottom: 20px;
  box-shadow: 0 0 0 6px var(--color-white), 0 0 0 7px var(--color-border);
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}

.process-step:hover .step-number {
  background: var(--color-accent);
  box-shadow: 0 0 0 6px var(--color-white), 0 0 0 7px var(--color-accent);
  transform: scale(1.08);
}

.process-step h3 { font-size: 1.04rem; margin-bottom: 8px; }
.process-step p { font-size: 0.9rem; color: var(--color-steel); margin: 0; }

/* =========================================================================
   Beispiele moeglicher Projektleistungen -- Premium-Cards
   ========================================================================= */
.examples-note {
  font-size: 0.94rem;
  color: var(--color-steel);
  border-left: 3px solid var(--color-accent);
  padding-left: 18px;
  margin-bottom: 40px;
  max-width: 720px;
}

.examples-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.example-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 26px 26px;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-size: 0.98rem;
  font-weight: 550;
  color: var(--color-anthracite);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.example-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-card-hover);
  border-color: transparent;
}

.example-card .example-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: var(--color-accent-soft);
  color: var(--color-navy);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.example-card .example-icon svg { width: 22px; height: 22px; }

.example-card:hover .example-icon { background: var(--color-navy); color: var(--color-white); }

/* =========================================================================
   Kontakt
   ========================================================================= */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: flex-start;
}

.contact-info-card {
  background: linear-gradient(160deg, var(--color-navy) 0%, var(--color-navy-2) 100%);
  color: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-card-hover);
  position: sticky;
  top: 130px;
}

.contact-info-card h3 { color: var(--color-white); font-size: 1.3rem; }

.contact-info-card .info-line {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 22px;
  font-size: 0.98rem;
  color: rgba(255,255,255,0.88);
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255,255,255,0.14);
}

.contact-info-card .info-line:last-of-type { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }

.contact-info-card .info-line strong {
  color: var(--color-white);
  font-weight: 700;
  font-family: var(--font-display);
  font-size: 1.05rem;
}

.contact-info-card .info-line a { color: var(--color-white); border-bottom: 1px solid rgba(255,255,255,0.35); transition: border-color var(--transition); }
.contact-info-card .info-line a:hover { border-color: var(--color-accent); color: var(--color-accent); }

.contact-form {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-card);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group { margin-bottom: 20px; }

.form-group label {
  display: block;
  font-size: 0.86rem;
  font-weight: 650;
  font-family: var(--font-display);
  color: var(--color-navy);
  margin-bottom: 8px;
}

.form-group .required { color: var(--color-accent-dark); }

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.97rem;
  color: var(--color-anthracite);
  background: var(--color-white);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-accent);
  outline: none;
  box-shadow: 0 0 0 4px var(--color-accent-soft);
}

.form-group textarea { min-height: 140px; resize: vertical; }

.checkbox-group {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.checkbox-group input { margin-top: 4px; }

.checkbox-group label { font-weight: 400; font-family: var(--font-sans); font-size: 0.88rem; color: var(--color-steel); }

.form-status {
  margin-top: 18px;
  font-size: 0.92rem;
  font-weight: 600;
  display: none;
}

.form-status.success { display: block; color: var(--color-accent-dark); }
.form-status.error { display: block; color: #b3382c; }

/* =========================================================================
   Footer -- vier Spalten
   ========================================================================= */
.site-footer {
  background: var(--color-navy-deep);
  color: rgba(255,255,255,0.72);
  padding: 88px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-col h4 {
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 22px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.footer-brand img.logo {
  height: 40px;
  width: auto;
}

.footer-brand .brand-name { color: var(--color-white); font-family: var(--font-display); font-weight: 700; }

.footer-col p { color: rgba(255,255,255,0.6); font-size: 0.92rem; }

.footer-col ul { display: flex; flex-direction: column; gap: 12px; }
.footer-col ul a { font-size: 0.92rem; color: rgba(255,255,255,0.72); transition: color var(--transition), padding-left var(--transition); }
.footer-col ul a:hover { color: var(--color-white); padding-left: 4px; }

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px;
  padding-top: 28px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.45);
}

.footer-bottom a:hover { color: var(--color-white); }

/* =========================================================================
   Legal pages (Impressum / Datenschutz)
   ========================================================================= */
.legal-page main {
  padding: 176px 0 96px;
}

.legal-page h2 { margin-top: 44px; }
.legal-page h2:first-child { margin-top: 0; }

.legal-placeholder {
  background: #fff7e6;
  border: 1px dashed #d6a53c;
  color: #7a5510;
  padding: 2px 8px;
  border-radius: 3px;
  font-size: 0.92em;
}

.legal-note-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  margin-bottom: 44px;
  font-size: 0.92rem;
  color: var(--color-steel);
}

/* =========================================================================
   Scroll reveal (dezente Animation, gestaffelt)
   ========================================================================= */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 700ms cubic-bezier(0.16, 1, 0.3, 1), transform 700ms cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Gruppe A: Der Grid-Container selbst traegt die Klasse "reveal" -- die
   Kinder werden gestaffelt eingeblendet, sobald der Container sichtbar wird
   (industries-grid, examples-grid). */
.examples-grid .example-card,
.industries-grid .industry-item {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms cubic-bezier(0.16, 1, 0.3, 1), transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.examples-grid.is-visible .example-card,
.industries-grid.is-visible .industry-item {
  opacity: 1;
  transform: translateY(0);
}

/* Gruppe B: Die einzelnen Karten tragen selbst die Klasse "reveal"
   (service-card, process-step) -- hier wird nur eine gestaffelte
   Verzoegerung ergaenzt, die Ein-/Ausblendung uebernimmt die generische
   .reveal-Regel weiter oben. */

.services-grid .service-card:nth-child(1) { transition-delay: 40ms; }
.services-grid .service-card:nth-child(2) { transition-delay: 90ms; }
.services-grid .service-card:nth-child(3) { transition-delay: 140ms; }
.services-grid .service-card:nth-child(4) { transition-delay: 190ms; }
.services-grid .service-card:nth-child(5) { transition-delay: 240ms; }
.services-grid .service-card:nth-child(6) { transition-delay: 290ms; }
.services-grid .service-card:nth-child(7) { transition-delay: 340ms; }

.process-list .process-step:nth-child(1) { transition-delay: 40ms; }
.process-list .process-step:nth-child(2) { transition-delay: 110ms; }
.process-list .process-step:nth-child(3) { transition-delay: 180ms; }
.process-list .process-step:nth-child(4) { transition-delay: 250ms; }
.process-list .process-step:nth-child(5) { transition-delay: 320ms; }

.examples-grid .example-card:nth-child(1) { transition-delay: 40ms; }
.examples-grid .example-card:nth-child(2) { transition-delay: 100ms; }
.examples-grid .example-card:nth-child(3) { transition-delay: 160ms; }
.examples-grid .example-card:nth-child(4) { transition-delay: 220ms; }
.examples-grid .example-card:nth-child(5) { transition-delay: 280ms; }
.examples-grid .example-card:nth-child(6) { transition-delay: 340ms; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal,
  .services-grid .service-card,
  .examples-grid .example-card,
  .industries-grid .industry-item,
  .process-list .process-step,
  .hero h1, .hero .subtitle, .hero-actions, .hero-tagline {
    opacity: 1; transform: none; transition: none; animation: none;
  }
  .industry-item .industry-icon { animation: none; }
  .main-nav a.nav-link {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 980px) {
  .process-list { grid-template-columns: repeat(3, 1fr); }
  .process-list::before { display: none; }
  .about-facts { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { max-width: 520px; aspect-ratio: 16/10; }
  .contact-grid { grid-template-columns: 1fr; }
  .contact-info-card { position: static; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 40px; }
}

@media (max-width: 860px) {
  .site-header { padding: 14px 14px 0; }
  .header-inner {
    padding: 0 12px 0 16px;
    height: 74px;
    /* backdrop-filter erzeugt einen eigenen Containing Block fuer
       position:fixed-Nachfahren (u.a. in Safari/Chrome). Dadurch wurde
       das mobile Menu (.main-nav, position:fixed) faelschlicherweise
       relativ zu dieser 74px hohen Leiste statt zum Viewport positioniert
       und auf eine winzige Pille zusammengestaucht. Fix: Auf Mobil kein
       backdrop-filter mehr, stattdessen ein fast deckender Weisston. */
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    background: rgba(255, 255, 255, 0.98);
  }
  .brand img.logo { height: 42px; flex-shrink: 0; }

  /* Markenname im Header auf dem Handy: "S" oben, "Ingenieurbüro"
     darunter zentriert (statt einer Zeile, die bei schmalen Displays
     abgeschnitten wurde). Kompaktes, vollstaendig lesbares Logo-Lockup.
     Bewusst auf ".header-inner" beschraenkt, damit der Footer-Markenname
     (gleiche Klasse "brand-name", andere Struktur) unveraendert bleibt. */
  .header-inner .brand { min-width: 0; }
  .header-inner .brand-name {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1 1 auto;
    min-width: 0;
    line-height: 1.15;
  }
  .header-inner .brand-name-mark {
    margin-right: 0;
    font-size: 1.02rem;
    font-weight: 800;
  }
  .header-inner .brand-name-full {
    font-size: 0.6rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    color: var(--color-steel);
    max-width: 100%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .header-actions { flex-shrink: 0; }

  .main-nav {
    position: fixed;
    top: 100px;
    left: 14px;
    right: 14px;
    bottom: 24px;
    background: rgba(255, 255, 255, 0.86);
    backdrop-filter: saturate(160%) blur(18px);
    -webkit-backdrop-filter: saturate(160%) blur(18px);
    border: 1px solid rgba(14, 36, 56, 0.06);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-float);
    flex-direction: column;
    align-items: stretch;
    padding: 20px;
    transform: translateY(-16px);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition-slow), opacity var(--transition-slow), visibility var(--transition-slow);
    overflow-y: auto;
  }

  .main-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .main-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .main-nav ul li { width: 100%; }

  .main-nav a.nav-link {
    display: block;
    width: 100%;
    padding: 16px 14px;
    font-size: 1.05rem;
    border-radius: var(--radius-sm);
    border-bottom: 1px solid var(--color-border);
    transition: color var(--transition), background var(--transition), transform 320ms cubic-bezier(0.16, 1, 0.3, 1), opacity 320ms cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 0;
    transform: translateY(-8px);
  }
  .main-nav a.nav-link::after { display: none; }
  .main-nav a.nav-link:active { background: var(--color-accent-soft); }

  .main-nav ul li:last-child a.nav-link { border-bottom: none; }

  /* Gestaffeltes Einblenden der Menuepunkte beim Oeffnen */
  .main-nav.is-open ul li:nth-child(1) a.nav-link { transition-delay: 60ms; }
  .main-nav.is-open ul li:nth-child(2) a.nav-link { transition-delay: 100ms; }
  .main-nav.is-open ul li:nth-child(3) a.nav-link { transition-delay: 140ms; }
  .main-nav.is-open ul li:nth-child(4) a.nav-link { transition-delay: 180ms; }
  .main-nav.is-open ul li:nth-child(5) a.nav-link { transition-delay: 220ms; }
  .main-nav.is-open ul li:nth-child(6) a.nav-link { transition-delay: 260ms; }
  .main-nav.is-open a.nav-link {
    opacity: 1;
    transform: translateY(0);
  }

  .menu-toggle { display: flex; }

  .process-list { grid-template-columns: 1fr 1fr; }
  .hero { margin-top: -88px; padding-top: 178px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  section { padding: 84px 0; }
  .hero { padding: 150px 0 80px; }
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
  .form-row { grid-template-columns: 1fr; }
  .process-list { grid-template-columns: 1fr; }
  .about-facts { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 36px; }
  .brand-name { font-size: 0.92rem; }
  .contact-form { padding: 28px 22px; }
  .service-card { padding: 28px 24px; }
}

/* =========================================================================
   Kontakt -- ergaenzte Elemente (Adresse, Telefon, Maps, LinkedIn)
   Rein additiv, veraendert keine bestehenden Regeln oben.
   ========================================================================= */
.contact-info-card .info-line .info-address { display: block; }

.contact-info-card .info-label {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}

.contact-info-card .info-line.contact-social-row { flex-direction: row; align-items: center; flex-wrap: wrap; gap: 10px 14px; }
.contact-info-card .info-line.contact-social-row .info-label { width: 100%; }

.map-btn {
  align-self: flex-start;
  margin-top: 10px;
  padding: 10px 18px;
  font-size: 0.86rem;
}

.contact-info-card .btn-outline {
  color: var(--color-white);
  border-color: rgba(255,255,255,0.32);
}
.contact-info-card .btn-outline:hover {
  border-color: var(--color-white);
  background: rgba(255,255,255,0.08);
}
.contact-info-card .btn-outline .ripple { background: rgba(255,255,255,0.35); }

.contact-social-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.contact-social-row .social-icon-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  color: var(--color-white);
  border-bottom: none !important;
  transition: background var(--transition), transform var(--transition);
}
.contact-social-row .social-icon-link svg { width: 17px; height: 17px; }
.contact-social-row .social-icon-link:hover { background: var(--color-accent); transform: translateY(-2px); }