/* =========================
   Farb- & Stil-Variablen
========================= */
:root {
  --bg-color: #f8f9fb;
  --text-color: #1f1f1f;
  --accent-color: #0070f3;
  --accent-light: #e6f0ff;
  --card-bg: #ffffff;
  --shadow: 0 6px 25px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --transition: all 0.4s ease;
}

[data-theme="dark"] {
  --bg-color: #0e0e0e;
  --text-color: #f3f3f3;
  --accent-color: #4dabf7;
  --accent-light: #1a2738;
  --card-bg: #1a1a1a;
  --shadow: 0 6px 25px rgba(0, 0, 0, 0.4);
}

/* =========================
   Globales Layout
========================= */
body {
  margin: 0;
  font-family: 'Inter', sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: var(--transition);
}

html {
  scroll-behavior: smooth;
}

/* =========================
   Header & Navigation
========================= */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  background: var(--card-bg);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-color);
}

.nav a {
  color: var(--text-color);
  margin-left: 1.2rem;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s;
}

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

.theme-toggle {
  margin-left: 1.2rem;
  background: none;
  border: 1px solid var(--accent-color);
  color: var(--accent-color);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  cursor: pointer;
  font-weight: 500;
  transition: var(--transition);
}

.theme-toggle:hover {
  background: var(--accent-color);
  color: white;
}

/* =========================
   Hero-Bereich
========================= */
.hero {
  background: linear-gradient(135deg, var(--accent-color), #00b4d8);
  color: white;
  text-align: center;
  padding: 8rem 2rem;
  box-shadow: var(--shadow);
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  animation: fadeIn 1.5s ease forwards;
}

.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: 2rem;
}

.btn-primary {
  display: inline-block;
  background-color: white;
  color: var(--accent-color);
  padding: 1rem 2rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: bold;
  transition: var(--transition);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  transform: translateY(-3px);
  background: #e6e6e6;
}

/* =========================
   Allgemeine Sektionen
========================= */
.section {
  padding: 5rem 2rem;
  max-width: 1200px;
  margin: auto;
  text-align: center;
}

h2 {
  font-size: 2rem;
  margin-bottom: 2.5rem;
  position: relative;
}

h2::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background: var(--accent-color);
  margin: 0.5rem auto;
  border-radius: 5px;
}

/* =========================
   Feature Cards
========================= */
.features-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.5rem;
}

.feature-card {
  background: var(--accent-light);
  color: var(--text-color);
  padding: 1.5rem;
  text-align: center;
  border-radius: var(--radius);
  font-weight: 500;
  width: 250px;
  transition: var(--transition);
}

.feature-card:hover {
  transform: translateY(-5px);
}

/* =========================
   Leistungen
========================= */
.services {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.service-card {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: var(--transition);
  width: 270px;
}

.service-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 35px rgba(0, 0, 0, 0.12);
}

.service-card h3 {
  color: var(--accent-color);
  margin-top: 0;
}

/* =========================
   Projektablauf (zentriert)
========================= */
.process-steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  text-align: center;
  max-width: 1000px;
  margin: 0 auto;
}

.step {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  width: 280px;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.step:hover {
  transform: translateY(-5px);
}

.step-number {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-color);
  color: white;
  font-weight: 700;
  font-size: 1.1rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  margin-bottom: 1rem;
}

.step h4 {
  margin-bottom: 0.5rem;
  color: var(--accent-color);
  font-weight: 700;
}

.step p {
  margin: 0;
  line-height: 1.5;
}

/* =========================
   Referenzen
========================= */
.ref-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
}

.ref-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  width: 300px;
  transition: var(--transition);
}

.ref-card img {
  width: 100%;
  display: block;
}

.ref-card h4 {
  color: var(--accent-color);
  margin: 1rem;
}

.ref-card p {
  margin: 0 1rem 1.5rem;
}

/* =========================
   Über uns
========================= */
.about p {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  line-height: 1.6;
}

/* =========================
   Kontakt
========================= */
.contact-info {
  font-size: 1.1rem;
  line-height: 1.8;
}

.contact-info a {
  color: var(--accent-color);
  text-decoration: none;
}

.contact-info a:hover {
  text-decoration: underline;
}

/* =========================
   Footer
========================= */
.footer {
  background: var(--card-bg);
  text-align: center;
  padding: 2rem 1rem;
  box-shadow: var(--shadow);
}

/* =========================
   Animationen
========================= */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-visible {
  opacity: 1;
  transform: translateY(0);
}