/* =================================================================
   SX ENGINEERING — STYLESHEET
   -----------------------------------------------------------------
   Inhaltsverzeichnis
   1.  Variablen & Grundeinstellungen
   2.  Reset & Basis-Typografie
   3.  Layout-Hilfsklassen (Container, Sections)
   4.  Navigation
   5.  Hero / Kopfbereich
   6.  Buttons
   7.  Leistungen (Karten & Icons)
   8.  Über uns
   9.  Statistik-Leiste
   10. Referenzen / Projektgalerie
   11. Kontakt & Formular
   12. Detailseiten (ausführliche Leistungsbeschreibungen)
   13. Footer
   14. Sprachumschalter, Back-to-Top, Reveal-Animationen
   15. Responsive Anpassungen
   ================================================================= */


/* -----------------------------------------------------------------
   0. SCHRIFTARTEN (lokal eingebunden – keine Verbindung zu Google)
   Dateien liegen in media/fonts/
   ----------------------------------------------------------------- */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 300;
  font-display: swap;
  src: url('media/fonts/inter-300.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('media/fonts/inter-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('media/fonts/inter-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('media/fonts/inter-600.woff2') format('woff2');
}
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('media/fonts/inter-700.woff2') format('woff2');
}
@font-face {
  font-family: 'Russo One';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('media/fonts/russo-one-400.woff2') format('woff2');
}


/* -----------------------------------------------------------------
   1. VARIABLEN & GRUNDEINSTELLUNGEN
   ----------------------------------------------------------------- */
:root {
  /* Markenfarben */
  --primary: #12344d;        /* Dunkles Navy – Headlines, Flächen */
  --secondary: #1f5f8b;      /* Mittleres Blau – Links, sekundäre Flächen */
  --accent: #14b8a6;         /* Türkis – Highlights, CTAs, aktive Zustände */
  --accent-hover: #0d9488;   /* Türkis, dunkler – Hover-/Fokuszustände */

  /* Neutrale Töne */
  --white: #ffffff;
  --light: #f5f7fa;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --dark: #1c1c1c;

  /* Sonstiges */
  --shadow: rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --radius-sm: 4px;
  --transition: all 0.3s ease;
  --max-width: 1200px;
  --nav-height: 70px;
}

/* -----------------------------------------------------------------
   2. RESET & BASIS-TYPOGRAFIE
   ----------------------------------------------------------------- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  background-color: var(--white);
  font-family: 'Inter', sans-serif;
  color: var(--dark);
  line-height: 1.6;
  padding-top: var(--nav-height);
  overflow-x: hidden;
}

h1 {
  font-size: 60px;
  font-family: 'Russo One', sans-serif;
  font-size: 17px;
  margin-bottom: 4px;
  letter-spacing: 0.5px;
  color: black;
}


h2, h3 {
  font-family: 'Russo One', sans-serif;
  line-height: 1.25;
}

a {
  color: inherit;
}

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

::selection {
  background: var(--accent);
  color: var(--white);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

/* -----------------------------------------------------------------
   3. LAYOUT-HILFSKLASSEN
   ----------------------------------------------------------------- */
section {
  padding: 100px 20px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-eyebrow {
  display: block;
  text-align: center;
  color: var(--accent-hover);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 2px;
  margin-bottom: 12px;
}

section h2 {
  font-size: 36px;
  color: var(--primary);
  text-align: center;
  margin-bottom: 10px;
  position: relative;
  padding-bottom: 18px;
}

section h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 56px;
  height: 3px;
  border-radius: 2px;
  background-color: var(--accent);
}

.section-subtitle {
  text-align: center;
  color: var(--gray-500);
  font-size: 18px;
  margin-bottom: 60px;
  font-weight: 400;
}

.section-subtitle.on-dark {
  color: var(--gray-300);
}

.container {
  max-width: 1160px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 60px;
}

/* -----------------------------------------------------------------
   4. NAVIGATION
   ----------------------------------------------------------------- */
nav {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 2px 15px var(--shadow);
  z-index: 1000;
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
  height: var(--nav-height);
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.logo-icon {
  height: 38px;
  width: auto;
  transition: var(--transition);
}

.logo:hover .logo-icon {
  transform: scale(1.05);
}

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

nav ul {
  list-style-type: none;
  display: flex;
  align-items: center;
  gap: 4px;
}

nav ul li a {
  position: relative;
  display: block;
  color: var(--dark);
  text-decoration: none;
  padding: 10px 14px;
  font-weight: 500;
  font-size: 15px;
  transition: var(--transition);
}

nav ul li a::after {
  content: "";
  position: absolute;
  left: 14px;
  right: 14px;
  bottom: 4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

nav ul li a:hover,
nav ul li a.active {
  color: var(--secondary);
}

nav ul li a:hover::after,
nav ul li a.active::after {
  transform: scaleX(1);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  margin-left: 12px;
  padding-left: 20px;
  border-left: 1px solid var(--gray-200);
}

.lang-current {
  color: var(--primary);
}

.lang-sep {
  color: var(--gray-300);
}

.lang-link {
  color: var(--gray-500);
  text-decoration: none;
  transition: var(--transition);
}

.lang-link:hover {
  color: var(--accent-hover);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 26px;
  height: 18px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--primary);
  border-radius: 2px;
  transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

.nav-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: #1c3249;
  margin: 0 20px;
  justify-content: space-between;
  white-space: nowrap;
}

.nav-right {
  display: flex;
  align-items: center;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 15px;
  margin: 0;
  padding: 0;
}


/* -----------------------------------------------------------------
   5. HERO / KOPFBEREICH
   ----------------------------------------------------------------- */
header {
  position: relative;
  background-image: url('media/img/hintergrund.jpg')/*, linear-gradient(135deg, var(--primary), var(--secondary))*/;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  background-attachment: fixed;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
}

header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.25);
  z-index: 1;
}

header::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  /*background-image:
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.05) 0px, rgba(255, 255, 255, 0.05) 1px, transparent 1px, transparent 110px),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.05) 0px, rgba(255, 255, 255, 0.05) 1px, transparent 1px, transparent 110px); */
}

.hero {
  position: relative;
  z-index: 3;
  color: var(--white);
  max-width: 900px;
  padding: 40px 20px;
}

.hero h1 {
  font-size: 60px;
  margin-bottom: 20px;
  letter-spacing: 2px;
  color: var(--white);
}


.hero-logo {
  display: block;
  margin: 0 auto 35px;
  width: 450px;
  max-width: 82vw;
  height: auto;
}

.hero .slogan-main {
  font-size: 26px;
  font-weight: 400;
  margin-bottom: 15px;
  color: var(--white);
}

.hero .slogan-sub {
  font-size: 18px;
  font-weight: 300;
  color: var(--gray-300);
  margin-bottom: 40px;
  letter-spacing: 1px;
}

.scroll-indicator {
  position: absolute;
  bottom: 36px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  width: 26px;
  height: 42px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-radius: 20px;
  display: flex;
  justify-content: center;
  padding-top: 8px;
  text-decoration: none;
}

.scroll-indicator span {
  width: 4px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollDown 1.6s infinite;
}

@keyframes scrollDown {
  0%   { transform: translateY(0); opacity: 1; }
  70%  { transform: translateY(14px); opacity: 0; }
  100% { opacity: 0; }
}

/* Kompakter Seiten-Header für Unterseiten (Leistungsdetails) */
.page-header {
  min-height: auto;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  background-attachment: scroll;
  padding: 170px 20px 90px;
}

.page-header::before {
  content: none;
}

.page-hero h1 {
  font-size: 44px;
}

.breadcrumb {
  font-size: 14px;
  margin-bottom: 18px;
  color: rgba(255, 255, 255, 0.75);
}

.breadcrumb a {
  color: rgba(255, 255, 255, 0.9);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.35);
}

.breadcrumb a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* -----------------------------------------------------------------
   6. BUTTONS
   ----------------------------------------------------------------- */
.btn {
  background: var(--secondary);
  color: var(--white);
  padding: 14px 30px;
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
  transition: var(--transition);
  display: inline-block;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  margin-top: 30px;
}


.btn:hover {
  background: var(--primary);
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-accent {
  background: var(--accent);
  color: var(--primary);
}

.btn-accent:hover {
  background: var(--white);
  color: var(--primary);
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent);
  color: var(--accent);
  padding: 12px 28px;
}

.btn-outline:hover {
  background: var(--accent);
  color: var(--primary);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
  text-align: center;
}

/* -----------------------------------------------------------------
   7. LEISTUNGEN — KARTEN & ICONS
   ----------------------------------------------------------------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 30px;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--white);
  padding: 40px 34px;
  border-radius: var(--radius);
  border-top: 4px solid var(--primary);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.15);
  border-top-color: var(--accent);
}

.card-icon {
  width: 52px;
  height: 52px;
  background: var(--light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 25px;
  color: var(--secondary);
  transition: var(--transition);
}

.card-icon svg {
  width: 26px;
  height: 26px;
}

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

.card h3 {
  font-size: 20px;
  color: var(--primary);
  margin-bottom: 15px;
  font-weight: 600;
  font-family: 'Inter', sans-serif;
}

.card ol {
  padding-left: 20px;
  color: var(--gray-600);
  font-size: 15px;
  flex-grow: 1;
}

.card ol li {
  margin-bottom: 8px;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 24px;
  color: var(--secondary);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: var(--transition);
}

.card-link:hover {
  color: var(--accent-hover);
  gap: 10px;
}

/* -----------------------------------------------------------------
   8. ÜBER UNS
   ----------------------------------------------------------------- */
.about-bg {
  background-color: var(--light);
  width: 100%;
}

.about-text {
  flex: 1;
}

.about-text h2 {
  text-align: left;
  margin-bottom: 25px;
}

.about-text h2::after {
  left: 0;
  transform: none;
}

.about-text p {
  font-size: 16px;
  color: var(--gray-700);
  margin-bottom: 20px;
  line-height: 1.8;
}

.about-photo {
  position: relative;
  width: 200px;
  height: 300px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  border: 4px solid var(--white);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  background: linear-gradient(135deg, var(--light), var(--gray-200));
}

.about-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-photo.img-missing::after {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
  color: var(--secondary);
  font-size: 14px;
}

.about-photo.img-missing img {
  display: none;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 30px;
  flex-wrap: wrap;
}

.about-stats .stat-number {
  font-size: 30px;
}

/* -----------------------------------------------------------------
   9. STATISTIK-LEISTE
   ----------------------------------------------------------------- */
.stats-bg {
  background: var(--light);
  border-bottom: 1px solid var(--gray-200);
}

.stats-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 46px 20px;
  display: flex;
  justify-content: space-around;
  flex-wrap: wrap;
  gap: 30px;
  text-align: center;
}

.stat-number {
  display: block;
  font-family: 'Russo One', sans-serif;
  font-size: 36px;
  color: var(--primary);
}

.stat-label {
  display: block;
  color: var(--gray-500);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 6px;
}

/* -----------------------------------------------------------------
   10. REFERENZEN / PROJEKTGALERIE
   ----------------------------------------------------------------- */
.reference-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.reference-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
  transition: var(--transition);
}

.reference-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
}

.reference-image {
  position: relative;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, var(--light), var(--gray-200));
  overflow: hidden;
}

.reference-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.reference-card:hover .reference-image img {
  transform: scale(1.06);
}

.reference-image.img-missing::after {
  content: attr(data-placeholder);
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  text-align: center;
  color: var(--secondary);
  font-size: 14px;
  font-weight: 500;
}

.reference-image.img-missing img {
  display: none;
}

.reference-content {
  padding: 22px 24px 26px;
}

.reference-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--accent-hover);
  background: rgba(20, 184, 166, 0.1);
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}

.reference-content p {
  color: var(--gray-600);
  font-size: 15px;
}

/* -----------------------------------------------------------------
   11. KONTAKT & FORMULAR
   ----------------------------------------------------------------- */
.contact-bg {
  background-color: var(--primary);
  color: var(--white);
  width: 100%;
}

.contact-bg h2 {
  color: var(--white);
}

.contact-grid {
  max-width: 1000px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 60px;
  text-align: left;
}

.contact-info h3 {
  font-size: 22px;
  margin-bottom: 4px;
  font-family: 'Inter', sans-serif;
  font-weight: 600;
}

.contact-info > p {
  color: var(--gray-300);
  margin-bottom: 22px;
}

.contact-list {
  list-style: none;
  margin-bottom: 28px;
}

.contact-list li {
  margin-bottom: 12px;
  font-size: 15px;
}

.contact-list a {
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  transition: var(--transition);
}

.contact-list a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.contact-form {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 36px;
}

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

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

.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--gray-300);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  color: var(--white);
  font-family: 'Inter', sans-serif;
  font-size: 15px;
  transition: var(--transition);
}

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(255, 255, 255, 0.4);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(255, 255, 255, 0.13);
}

.form-group select option {
  color: var(--dark);
}

.form-note {
  font-size: 13px;
  color: var(--gray-400);
  margin-top: 16px;
  text-align: center;
}

/* -----------------------------------------------------------------
   12. DETAILSEITEN (Leistungsbeschreibungen)
   ----------------------------------------------------------------- */
.detail-content {
  padding-top: 90px;
}

.detail-container {
  max-width: 820px;
  margin: 0 auto;
}

.detail-intro {
  font-size: 19px;
  color: var(--gray-600);
  margin-bottom: 55px;
  line-height: 1.8;
}

.detail-block {
  margin-bottom: 45px;
  padding-bottom: 45px;
  border-bottom: 1px solid var(--gray-200);
}

.detail-block:last-of-type {
  border-bottom: none;
  margin-bottom: 30px;
  padding-bottom: 0;
}

.detail-block h2 {
  font-size: 21px;
  color: var(--primary);
  text-align: left;
  padding-bottom: 0;
  margin-bottom: 14px;
}

.detail-block h2::after {
  content: none;
}

.detail-block p {
  color: var(--gray-600);
  font-size: 16px;
  line-height: 1.85;
}

.detail-cta {
  text-align: center;
  background: var(--light);
  padding: 50px 30px;
  border-radius: var(--radius);
}

.detail-cta p {
  font-size: 19px;
  color: var(--primary);
  margin-bottom: 20px;
  font-weight: 500;
}

.legal-note {
  font-style: italic;
  color: var(--gray-500);
  font-size: 14px;
  margin-bottom: 40px;
}

.legal-container {
  max-width: 780px;
  margin: 0 auto;
}

.legal-container h2 {
  text-align: left;
  font-size: 20px;
  margin: 40px 0 12px;
  padding-bottom: 0;
}

.legal-container h2::after {
  content: none;
}

.legal-container p {
  color: var(--gray-600);
  margin-bottom: 10px;
}

.placeholder-note {
  background: rgba(20, 184, 166, 0.08);
  border-left: 3px solid var(--accent);
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  color: var(--gray-700) !important;
  font-size: 14px;
  margin: 30px 0;
}

/* -----------------------------------------------------------------
   13. FOOTER
   ----------------------------------------------------------------- */
footer {
  background-color: var(--dark);
  color: var(--gray-400);
  padding: 45px 20px;
  font-size: 14px;
  border-top: 1px solid #2e2e2e;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-logo-badge {
  padding: 8px 10px;
  border-radius: 8px;
  display: inline-flex;
  flex-shrink: 0;
}

.footer-logo {
  height: 26px;
  width: auto;
  display: block;
}

.footer-brand h4 {
  color: var(--white);
  font-family: 'Russo One', sans-serif;
  font-size: 17px;
  margin-bottom: 4px;
  letter-spacing: 0.5px;
}

.footer-links a {
  color: var(--gray-400);
  text-decoration: none;
  margin-left: 20px;
  transition: var(--transition);
}

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

/* -----------------------------------------------------------------
   14. SPRACHUMSCHALTER / BACK-TO-TOP / REVEAL-ANIMATIONEN
   ----------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--white);
  border: none;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
  z-index: 900;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--accent);
  color: var(--primary);
}

.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.grid .reveal:nth-child(2) { transition-delay: 0.1s; }
.grid .reveal:nth-child(3) { transition-delay: 0.2s; }
.reference-grid .reveal:nth-child(2) { transition-delay: 0.08s; }
.reference-grid .reveal:nth-child(3) { transition-delay: 0.16s; }
.reference-grid .reveal:nth-child(4) { transition-delay: 0.24s; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-indicator span { animation: none; }
}

/* -----------------------------------------------------------------
   15. RESPONSIVE ANPASSUNGEN
   ----------------------------------------------------------------- */
@media (max-width: 1024px) {
  .contact-grid { gap: 40px; }
}

@media (max-width: 900px) {
  .container { flex-direction: column; text-align: center; }
  .about-text h2::after { left: 50%; transform: translateX(-50%); }
  .about-stats { justify-content: center; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-menu {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 10px 20px 20px;
    box-shadow: 0 12px 20px var(--shadow);
    clip-path: inset(0 0 100% 0);
    opacity: 0;
    pointer-events: none;
    transition: clip-path 0.35s ease, opacity 0.25s ease;
  }

  .nav-menu.open {
    clip-path: inset(0 0 0 0);
    opacity: 1;
    pointer-events: auto;
  }

  nav ul { flex-direction: column; width: 100%; gap: 0; }
  nav ul li { width: 100%; }
  nav ul li a { padding: 14px 4px; }
  nav ul li a::after { display: none; }

  .lang-switch {
    margin: 10px 0 0;
    padding: 15px 0 0;
    border-left: none;
    border-top: 1px solid var(--gray-200);
    width: 100%;
  }

  header { background-attachment: scroll; }
  .page-header { padding: 140px 20px 70px; }

  .hero h1 { font-size: 42px; }
  .hero .slogan-main { font-size: 20px; }
  .hero .slogan-sub { font-size: 15px; }
  .page-hero h1 { font-size: 32px; }

  .contact-grid { grid-template-columns: 1fr; text-align: center; }
  .contact-info { display: flex; flex-direction: column; align-items: center; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-links a { margin: 0 10px; }
}

@media (max-width: 480px) {
  section { padding: 70px 20px; }
  .hero h1 { font-size: 33px; }
  .hero .slogan-main { font-size: 18px; }
  .card { padding: 32px 24px; }
  .contact-form { padding: 26px 20px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .detail-content { padding-top: 60px; }
}