/* ========================================
   CSS Variables & Base Styles
   ======================================== */
:root {
  --color-primary: #219ebc;
  --color-primary-dark: #023047;
  --color-primary-light: #8ecae6;
  --color-secondary: #023047;
  --color-accent: #ffb703;
  --color-accent-dark: #fb8500;
  --color-text: #023047;
  --color-text-light: #219ebc;
  --color-text-dark: #023047;
  --color-background: #ffffff;
  --color-background-alt: #f0f9fc;
  --color-border: #8ecae6;
  --color-success: #10b981;
  --color-error: #ef4444;
  
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;
  
  --border-radius-sm: 0.375rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 0.75rem;
  --border-radius-xl: 1rem;
  
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  --container-max: 1200px;
  --header-height: 80px;
}

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

html {
  scroll-behavior: smooth;
}

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

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

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

ul, ol {
  list-style: none;
}

/* ========================================
   Utility Classes
   ======================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--spacing-3xl);
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-light);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 500;
  border-radius: var(--border-radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
  gap: var(--spacing-xs);
}

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

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

.btn-outline {
  background-color: transparent;
  color: var(--color-text-dark);
  border-color: var(--color-border);
}

.btn-outline:hover {
  background-color: var(--color-background-alt);
  border-color: var(--color-text-light);
  color: var(--color-text-dark);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  width: 100%;
}

/* ========================================
   Header & Navigation
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.logo-img {
  height: 40px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-dark);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
}

.nav-link {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-text);
  transition: color var(--transition-fast);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

.hamburger {
  width: 24px;
  height: 2px;
  background-color: var(--color-text-dark);
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--color-text-dark);
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -8px;
}

.hamburger::after {
  top: 8px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: translateY(-8px) rotate(-45deg);
}

/* ========================================
   Hero Section
   ======================================== */
.hero {
  padding: calc(var(--header-height) + var(--spacing-4xl)) 0 var(--spacing-4xl);
  background: linear-gradient(180deg, var(--color-background-alt) 0%, var(--color-background) 100%);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: 700;
  color: var(--color-text-dark);
  line-height: 1.1;
  margin-bottom: var(--spacing-lg);
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-xl);
  max-width: 500px;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.hero-image-placeholder {
  width: 100%;
  max-width: 500px;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.hero-image-placeholder svg {
  width: 100%;
  height: auto;
}

.hero-image {
  width: 100%;
  max-width: 550px;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

/* ========================================
   Features Section
   ======================================== */
.features {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
}

.feature-card {
  padding: var(--spacing-xl);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-base);
}

.feature-card:hover {
  border-color: var(--color-primary-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-icon {
  width: 224px;
  height: 157px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
}

.feature-icon-img {
  width: 224px;
  height: 224px;
  object-fit: contain;
}

.feature-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-sm);
}

.feature-description {
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ========================================
   Feature Detail Sections
   ======================================== */
.feature-detail {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background);
}

.feature-detail:nth-child(even) {
  background-color: var(--color-background-alt);
}

.feature-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.feature-detail-reverse .feature-detail-grid {
  direction: rtl;
}

.feature-detail-reverse .feature-detail-grid > * {
  direction: ltr;
}

.feature-detail-content .section-title {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.feature-detail-text {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-xl);
  line-height: 1.8;
}

.feature-detail-list {
  margin-bottom: var(--spacing-xl);
}

.feature-detail-list li {
  position: relative;
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.feature-detail-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 600;
}

.feature-detail-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.feature-detail-img {
  width: 100%;
  max-width: 600px;
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-border);
}

@media (max-width: 768px) {
  .feature-detail-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-detail-reverse .feature-detail-grid {
    direction: ltr;
  }
  
  .feature-detail-visual {
    order: 1;
  }
  
  .feature-detail-content .section-title {
    text-align: center;
  }
}

/* ========================================
   About Section
   ======================================== */
.about {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background-alt);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: center;
}

.about-content .section-title {
  text-align: left;
  margin-bottom: var(--spacing-lg);
}

.about-text {
  font-size: var(--font-size-lg);
  color: var(--color-text);
  margin-bottom: var(--spacing-xl);
}

.about-list {
  margin-bottom: var(--spacing-xl);
}

.about-list li {
  position: relative;
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.about-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 8px;
  height: 8px;
  background-color: var(--color-primary);
  border-radius: 50%;
}

.about-image-placeholder {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image-placeholder svg {
  width: 100%;
  height: auto;
}

.about-logo {
  width: 100%;
  max-width: 210px;
  height: auto;
  display: block;
  margin: 0 auto;
}

/* ========================================
   Pricing Section
   ======================================== */
.pricing {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  align-items: start;
}

.pricing-card {
  padding: var(--spacing-xl);
  background-color: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-lg);
  position: relative;
  transition: all var(--transition-base);
}

.pricing-card:hover {
  box-shadow: var(--shadow-lg);
}

.pricing-featured {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg);
  transform: scale(1.05);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--color-primary);
  color: white;
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
}

.pricing-name {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-md);
}

.pricing-price {
  margin-bottom: var(--spacing-md);
}

.price-amount {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-text-dark);
}

.price-period {
  font-size: var(--font-size-base);
  color: var(--color-text-light);
}

.pricing-description {
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  min-height: 48px;
}

.pricing-features {
  margin-bottom: var(--spacing-xl);
}

.pricing-features li {
  position: relative;
  padding-left: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.pricing-features li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: 600;
}

/* ========================================
   Contact Section
   ======================================== */
.contact {
  padding: var(--spacing-4xl) 0;
  background-color: var(--color-background-alt);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-3xl);
  align-items: start;
}

.contact-form-wrapper {
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-xs);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xl);
  padding-top: var(--spacing-xl);
}

.contact-info-item {
  display: flex;
  gap: var(--spacing-lg);
  align-items: flex-start;
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-primary);
  color: white;
  border-radius: var(--border-radius-md);
  flex-shrink: 0;
}

.contact-info-item h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-text-dark);
  margin-bottom: var(--spacing-xs);
}

.contact-info-item p {
  color: var(--color-text-light);
}

/* ========================================
   Footer
   ======================================== */
.footer {
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  background-color: var(--color-secondary);
  color: white;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-brand .logo-text {
  color: white;
}

.footer-description {
  color: rgba(255, 255, 255, 0.7);
  margin-top: var(--spacing-md);
  max-width: 300px;
}

.footer-links h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
}

.footer-links ul li {
  margin-bottom: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.5);
  font-size: var(--font-size-sm);
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 1024px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.75rem;
  }
  
  .features-grid,
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .pricing-featured {
    transform: scale(1);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
  }
}

@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2rem;
    --font-size-4xl: 1.75rem;
    --font-size-3xl: 1.5rem;
    --header-height: 70px;
  }
  
  .nav-toggle {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    background-color: var(--color-background);
    padding: var(--spacing-xl);
    gap: var(--spacing-lg);
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    overflow-y: auto;
  }
  
  .nav-menu.active {
    transform: translateX(0);
  }
  
  .nav-cta {
    margin-top: var(--spacing-md);
  }
  
  .hero .container {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-subtitle {
    max-width: none;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .hero-visual {
    order: -1;
  }
  
  .features-grid {
    grid-template-columns: 1fr;
  }
  
  .about-grid {
    grid-template-columns: 1fr;
  }
  
  .about-content .section-title {
    text-align: center;
  }
  
  .about-visual {
    order: -1;
  }
  
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
    margin: 0 auto;
  }
  
  .contact-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .footer-description {
    margin-left: auto;
    margin-right: auto;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-4xl: 4rem;
    --spacing-3xl: 3rem;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
}

/* ========================================
   Single Page Layout (Impressum, etc.)
   ======================================== */
.page {
  padding-top: calc(var(--header-height) + var(--spacing-3xl));
  padding-bottom: var(--spacing-4xl);
  min-height: 100vh;
}

.page-header {
  margin-bottom: var(--spacing-2xl);
}

.page-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-text-dark);
}

.page-content {
  max-width: 800px;
}

.page-content h2 {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  color: var(--color-text-dark);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
}

.page-content h2:first-child {
  margin-top: 0;
}

.page-content p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

.page-content strong {
  color: var(--color-text-dark);
}