/* ==========================================================================
   AppKiste — Modern Tech-Startup Design System
   Brand Colors: Midnight Navy (#0B192C) + Electric Cyan (#00B8C4)
   ========================================================================== */

:root {
  /* Brand Core Colors */
  --navy-950: #070F1B;
  --navy-900: #0B192C;
  --navy-850: #10223B;
  --navy-800: #162C4B;
  --navy-700: #1E3A5F;
  --navy-600: #2C4F7C;

  --cyan-500: #00B8C4;
  --cyan-400: #00D1DE;
  --cyan-600: #009EA8;
  --cyan-50: #E6F8FA;
  --cyan-glow: rgba(0, 184, 196, 0.25);

  /* Accents from Logo Floating App Tiles */
  --accent-green: #10B981;
  --accent-green-bg: rgba(16, 185, 129, 0.1);
  --accent-orange: #FF9800;
  --accent-orange-bg: rgba(255, 152, 0, 0.1);
  --accent-purple: #8B5CF6;
  --accent-purple-bg: rgba(139, 92, 246, 0.1);
  --accent-blue: #0284C7;
  --accent-blue-bg: rgba(2, 132, 199, 0.1);

  /* Neutrals & Surfaces */
  --bg-page: #F8FAFD;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #FFFFFF;
  --bg-surface-muted: #F1F5F9;
  
  --text-main: #0F172A;
  --text-muted: #475569;
  --text-subtle: #64748B;
  --text-inverse: #FFFFFF;
  --text-inverse-muted: #94A3B8;

  --border-light: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.14);
  --border-dark: rgba(255, 255, 255, 0.1);

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Plus Jakarta Sans", "Inter", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(11, 25, 44, 0.07), 0 2px 4px -2px rgba(11, 25, 44, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(11, 25, 44, 0.08), 0 4px 6px -4px rgba(11, 25, 44, 0.04);
  --shadow-xl: 0 20px 25px -5px rgba(11, 25, 44, 0.08), 0 8px 10px -6px rgba(11, 25, 44, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(11, 25, 44, 0.18);
  --shadow-cyan: 0 8px 24px -4px rgba(0, 184, 196, 0.35);

  /* Radii */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 1200px;
  --header-height: 80px;
}

/* ==========================================================================
   CSS Reset & Base Elements
   ========================================================================== */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.65;
  font-size: 1.0625rem; /* 17px */
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--cyan-600);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--cyan-500);
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
}

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol {
  list-style: none;
}

/* Focus outlines */
:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

@media (min-width: 768px) {
  .container {
    padding-inline: 2.5rem;
  }
}

.section {
  padding-block: 6rem;
  position: relative;
}

@media (min-width: 1024px) {
  .section {
    padding-block: 7.5rem;
  }
}

/* Section Header Component */
.section-header {
  text-align: center;
  max-width: 760px;
  margin-inline: auto;
  margin-bottom: 4rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--cyan-600);
  background-color: var(--cyan-50);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.25rem;
  border: 1px solid rgba(0, 184, 196, 0.2);
}

.section-tag.dark {
  background-color: rgba(0, 184, 196, 0.12);
  color: var(--cyan-400);
  border-color: rgba(0, 184, 196, 0.3);
}

.section-title {
  font-size: 2.25rem;
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--navy-900);
  margin-bottom: 1.25rem;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.85rem;
  }
}

.section-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
  line-height: 1.6;
}

@media (min-width: 768px) {
  .section-subtitle {
    font-size: 1.25rem;
  }
}

/* ==========================================================================
   Header & Navigation
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  display: flex;
  align-items: center;
  transition: all var(--transition-normal);
  background: rgba(248, 250, 253, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
}

.site-header.scrolled {
  background: rgba(255, 255, 255, 0.95);
  border-bottom: 1px solid var(--border-light);
  box-shadow: 0 4px 20px -2px rgba(11, 25, 44, 0.05);
  height: 72px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--navy-900);
  transition: transform var(--transition-fast);
}

.brand-link:hover {
  transform: translateY(-1px);
}

.brand-logo-img {
  height: 42px;
  width: auto;
  object-fit: contain;
}

.brand-text {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
}

.brand-text .app {
  color: var(--navy-900);
}

.brand-text .kiste {
  color: var(--cyan-500);
}

/* Desktop Navigation */
.desktop-nav {
  display: none;
  align-items: center;
  gap: 2rem;
}

@media (min-width: 992px) {
  .desktop-nav {
    display: flex;
  }
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--navy-850);
  padding: 0.5rem 0.25rem;
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--cyan-500);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--transition-fast);
  border-radius: 2px;
}

.nav-link:hover,
.nav-link.active {
  color: var(--cyan-600);
}

.nav-link:hover::after,
.nav-link.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

/* Navigation CTA Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  text-decoration: none;
  cursor: pointer;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan-500) 0%, var(--cyan-600) 100%);
  color: #FFFFFF;
  box-shadow: 0 4px 14px 0 rgba(0, 184, 196, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--cyan-400) 0%, var(--cyan-500) 100%);
  color: #FFFFFF;
  box-shadow: 0 6px 20px 0 rgba(0, 184, 196, 0.45);
  transform: translateY(-2px);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--navy-900);
  border: 1px solid var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--navy-50, #F8FAFC);
  color: var(--navy-950);
  border-color: var(--navy-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-dark {
  background: var(--navy-900);
  color: #FFFFFF;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.btn-dark:hover {
  background: var(--navy-800);
  color: var(--cyan-400);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 0.95rem 2rem;
  font-size: 1.0625rem;
  border-radius: var(--radius-lg);
}

/* Mobile Hamburger Button */
.hamburger-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0.5rem;
  border-radius: var(--radius-sm);
  background: transparent;
  gap: 5px;
  z-index: 1001;
}

@media (min-width: 992px) {
  .hamburger-btn {
    display: none;
  }
}

.hamburger-line {
  width: 24px;
  height: 2px;
  background-color: var(--navy-900);
  border-radius: 2px;
  transition: transform var(--transition-normal), opacity var(--transition-fast);
}

.hamburger-btn[aria-expanded="true"] .line-1 {
  transform: translateY(7px) rotate(45deg);
}

.hamburger-btn[aria-expanded="true"] .line-2 {
  opacity: 0;
}

.hamburger-btn[aria-expanded="true"] .line-3 {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Navigation Drawer */
.mobile-nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(11, 25, 44, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.mobile-nav-overlay.open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 85%;
  max-width: 380px;
  background: #FFFFFF;
  z-index: 999;
  padding: 6rem 2rem 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: -10px 0 30px rgba(0, 0, 0, 0.15);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
}

.mobile-drawer.open {
  transform: translateX(0);
}

.mobile-nav-links {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-nav-link {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-900);
  padding-block: 0.5rem;
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--cyan-600);
}

.mobile-drawer-footer {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.mobile-contact-pill {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
  font-weight: 600;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero-section {
  padding-top: calc(var(--header-height) + 3.5rem);
  padding-bottom: 6rem;
  position: relative;
  overflow: hidden;
  background: radial-gradient(1200px 800px at 50% -10%, rgba(0, 184, 196, 0.09) 0%, rgba(248, 250, 253, 0) 70%),
              linear-gradient(180deg, #FFFFFF 0%, var(--bg-page) 100%);
}

@media (min-width: 1024px) {
  .hero-section {
    padding-top: calc(var(--header-height) + 5rem);
    padding-bottom: 8rem;
  }
}

/* Subtle digital grid lines in hero */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(11, 25, 44, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 25, 44, 0.03) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 60% 50% at 50% 30%, #000 50%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 60% 50% at 50% 30%, #000 50%, transparent 100%);
  pointer-events: none;
}

.hero-content {
  text-align: center;
  max-width: 900px;
  margin-inline: auto;
  position: relative;
  z-index: 2;
}

/* Hero prominent logo container */
.hero-logo-wrapper {
  margin-bottom: 2rem;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.hero-logo-img {
  width: 160px;
  height: auto;
  filter: drop-shadow(0 14px 28px rgba(11, 25, 44, 0.12));
  animation: floatSubtle 6s ease-in-out infinite;
}

@media (min-width: 768px) {
  .hero-logo-img {
    width: 200px;
  }
}

@keyframes floatSubtle {
  0%, 100% {
    transform: translateY(0px) rotate(0deg);
  }
  50% {
    transform: translateY(-8px) rotate(0.8deg);
  }
}

/* Floating App Tiles around Logo */
.floating-tile {
  position: absolute;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 20px -3px rgba(11, 25, 44, 0.12);
  pointer-events: none;
  transition: transform var(--transition-normal);
}

.tile-orange {
  top: -15px;
  right: -30px;
  background: linear-gradient(135deg, #FFB300 0%, #FF7043 100%);
  animation: floatTile1 7s ease-in-out infinite;
}

.tile-green {
  top: 10px;
  left: -35px;
  background: linear-gradient(135deg, #34D399 0%, #059669 100%);
  animation: floatTile2 6.5s ease-in-out infinite 0.5s;
}

.tile-purple {
  bottom: 30px;
  left: -40px;
  background: linear-gradient(135deg, #F43F5E 0%, #8B5CF6 100%);
  animation: floatTile3 8s ease-in-out infinite 1s;
}

.tile-blue {
  bottom: 20px;
  right: -35px;
  background: linear-gradient(135deg, #38BDF8 0%, #2563EB 100%);
  animation: floatTile4 7.5s ease-in-out infinite 1.5s;
}

@keyframes floatTile1 {
  0%, 100% { transform: translate(0, 0) rotate(6deg); }
  50% { transform: translate(4px, -10px) rotate(10deg); }
}

@keyframes floatTile2 {
  0%, 100% { transform: translate(0, 0) rotate(-6deg); }
  50% { transform: translate(-5px, -8px) rotate(-12deg); }
}

@keyframes floatTile3 {
  0%, 100% { transform: translate(0, 0) rotate(4deg); }
  50% { transform: translate(-6px, 6px) rotate(0deg); }
}

@keyframes floatTile4 {
  0%, 100% { transform: translate(0, 0) rotate(-4deg); }
  50% { transform: translate(5px, 8px) rotate(-2deg); }
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--navy-900);
  background: #FFFFFF;
  padding: 0.45rem 1.25rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 12px rgba(11, 25, 44, 0.06);
  border: 1px solid var(--border-light);
}

.hero-tag .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--cyan-500);
  box-shadow: 0 0 0 3px rgba(0, 184, 196, 0.25);
}

.hero-title {
  font-size: 2.75rem;
  line-height: 1.12;
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--navy-950);
  margin-bottom: 1.5rem;
}

@media (min-width: 640px) {
  .hero-title {
    font-size: 3.5rem;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 4.25rem;
  }
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--navy-900) 20%, var(--cyan-600) 80%, var(--cyan-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.6;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: 2.5rem;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.35rem;
  }
}

.hero-cta-group {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3.5rem;
}

@media (min-width: 640px) {
  .hero-cta-group {
    flex-direction: row;
    gap: 1.25rem;
  }
}

/* Hero Trust Pillars / Badges */
.hero-highlights {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1.5rem 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
}

.highlight-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-muted);
}

.highlight-item svg {
  color: var(--cyan-500);
  flex-shrink: 0;
}

/* ==========================================================================
   Section: Über AppKiste
   ========================================================================== */

.about-section {
  background-color: #FFFFFF;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  align-items: center;
}

@media (min-width: 1024px) {
  .about-grid {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 4.5rem;
  }
}

.about-text-content {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about-lead {
  font-size: 1.35rem;
  line-height: 1.55;
  color: var(--navy-900);
  font-weight: 600;
}

.about-quote-box {
  background: linear-gradient(135deg, rgba(0, 184, 196, 0.08) 0%, rgba(11, 25, 44, 0.03) 100%);
  border-left: 4px solid var(--cyan-500);
  padding: 1.5rem 1.75rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-block: 0.5rem;
}

.about-quote-box .quote-statement {
  font-size: 1.45rem;
  font-weight: 800;
  letter-spacing: -0.015em;
  color: var(--navy-900);
  margin-bottom: 0.35rem;
}

.about-quote-box .quote-explanation {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.about-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
}

@media (min-width: 640px) {
  .about-pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

.pillar-card {
  background: var(--bg-surface-muted);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.pillar-card:hover {
  transform: translateY(-3px);
  border-color: rgba(0, 184, 196, 0.3);
}

.pillar-icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 0.85rem;
}

.pillar-card h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--navy-900);
  margin-bottom: 0.35rem;
}

.pillar-card p {
  font-size: 0.875rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* About visual card on right */
.about-visual-card {
  background: linear-gradient(145deg, var(--navy-900) 0%, var(--navy-850) 100%);
  border-radius: var(--radius-xl);
  padding: 2.5rem 2rem;
  color: #FFFFFF;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.about-visual-card::after {
  content: '';
  position: absolute;
  top: -40px;
  right: -40px;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(0, 184, 196, 0.35) 0%, transparent 70%);
  pointer-events: none;
}

.visual-studio-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 700;
  color: var(--cyan-400);
  background: rgba(0, 184, 196, 0.15);
  padding: 0.35rem 0.9rem;
  border-radius: var(--radius-full);
  margin-bottom: 1.5rem;
}

.visual-quote-title {
  font-size: 1.75rem;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 1.25rem;
  color: #FFFFFF;
}

.visual-list {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  margin-top: 1.5rem;
}

.visual-list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  font-size: 0.9375rem;
  color: var(--text-inverse-muted);
}

.visual-list-item svg {
  color: var(--cyan-400);
  flex-shrink: 0;
  margin-top: 3px;
}

.visual-list-item strong {
  color: #FFFFFF;
}

/* ==========================================================================
   Section: Projekte (The Core Showcase)
   ========================================================================== */

.projects-section {
  background-color: var(--bg-page);
  position: relative;
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}

@media (min-width: 1024px) {
  .projects-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
  }
}

.project-card {
  background: var(--bg-surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-2xl);
  border-color: rgba(0, 184, 196, 0.3);
}

.project-preview-wrapper {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background-color: var(--navy-900);
}

.project-preview-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.project-card:hover .project-preview-img {
  transform: scale(1.03);
}

.project-badge-pill {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  background: rgba(11, 25, 44, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.15);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.project-body {
  padding: 2.25rem 2rem 2rem;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-header-row {
  margin-bottom: 0.75rem;
}

.project-title {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--navy-900);
  margin-bottom: 0.25rem;
}

.project-subtitle {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--cyan-600);
  margin-bottom: 1rem;
}

.project-description {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* Feature tags / badges list inside card */
.project-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  margin-top: auto;
}

.feature-tag {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--navy-800);
  background: var(--bg-surface-muted);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-light);
}

.project-action-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border-light);
}

.project-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 700;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.project-link-external {
  font-size: 0.875rem;
  color: var(--text-subtle);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.project-link-external:hover {
  color: var(--cyan-600);
}

/* Card 4 - Special Custom Creation Card */
.project-card.card-custom {
  background: linear-gradient(145deg, #FFFFFF 0%, #F0FDF4 100%);
  border: 2px dashed rgba(0, 184, 196, 0.4);
}

.project-card.card-custom:hover {
  border-color: var(--cyan-500);
  border-style: solid;
}

/* ==========================================================================
   Section: Was wir entwickeln (Leistungen)
   ========================================================================== */

.services-section {
  background-color: #FFFFFF;
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.75rem;
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 2.25rem 1.75rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  position: relative;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: rgba(0, 184, 196, 0.35);
}

.service-icon-box {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  transition: transform var(--transition-fast);
}

.service-card:hover .service-icon-box {
  transform: scale(1.08);
}

.icon-app {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(16, 185, 129, 0.05) 100%);
  color: var(--accent-green);
  border: 1px solid rgba(16, 185, 129, 0.25);
}

.icon-web {
  background: linear-gradient(135deg, rgba(2, 132, 199, 0.15) 0%, rgba(2, 132, 199, 0.05) 100%);
  color: var(--accent-blue);
  border: 1px solid rgba(2, 132, 199, 0.25);
}

.icon-tools {
  background: linear-gradient(135deg, rgba(255, 152, 0, 0.15) 0%, rgba(255, 152, 0, 0.05) 100%);
  color: var(--accent-orange);
  border: 1px solid rgba(255, 152, 0, 0.25);
}

.icon-custom {
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15) 0%, rgba(139, 92, 246, 0.05) 100%);
  color: var(--accent-purple);
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.service-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--navy-900);
  margin-bottom: 0.85rem;
}

.service-desc {
  font-size: 0.9375rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ==========================================================================
   Section: Philosophie
   ========================================================================== */

.philosophy-section {
  background: linear-gradient(145deg, var(--navy-950) 0%, var(--navy-900) 100%);
  color: #FFFFFF;
  padding-block: 7rem;
  position: relative;
  overflow: hidden;
}

.philosophy-glow {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 184, 196, 0.15) 0%, transparent 65%);
  pointer-events: none;
}

.philosophy-content {
  text-align: center;
  max-width: 860px;
  margin-inline: auto;
  position: relative;
  z-index: 2;
}

.philosophy-tag {
  color: var(--cyan-400);
  background: rgba(0, 184, 196, 0.12);
  border: 1px solid rgba(0, 184, 196, 0.25);
  display: inline-flex;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  margin-bottom: 2rem;
}

.philosophy-statement {
  font-size: 2.5rem;
  line-height: 1.15;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #FFFFFF;
  margin-bottom: 2rem;
}

@media (min-width: 768px) {
  .philosophy-statement {
    font-size: 3.5rem;
  }
}

.philosophy-text {
  font-size: 1.25rem;
  color: #CBD5E1;
  line-height: 1.65;
  margin-bottom: 3.5rem;
  max-width: 720px;
  margin-inline: auto;
}

/* Philosophy 3 Contrast Pillars */
.philosophy-pillars {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .philosophy-pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

.philosophy-card {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
  padding: 2rem 1.5rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  text-align: left;
  transition: all var(--transition-normal);
}

.philosophy-card:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(0, 184, 196, 0.35);
  transform: translateY(-4px);
}

.philosophy-card-icon {
  margin-bottom: 1.25rem;
  color: var(--cyan-400);
}

.philosophy-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 0.5rem;
}

.philosophy-card p {
  font-size: 0.9375rem;
  color: #94A3B8;
  line-height: 1.5;
}

/* ==========================================================================
   Section: Kontakt
   ========================================================================== */

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

.contact-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
}

@media (min-width: 1024px) {
  .contact-container {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 4rem;
  }
}

.contact-info-col {
  display: flex;
  flex-direction: column;
}

.contact-title {
  font-size: 2.5rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--navy-900);
  line-height: 1.2;
  margin-bottom: 1.25rem;
}

.contact-lead {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 2.5rem;
}

.contact-details-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 2rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon-box {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--cyan-50);
  color: var(--cyan-600);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-item-title {
  font-size: 0.8125rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--text-subtle);
  margin-bottom: 0.25rem;
}

.contact-item-value {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--navy-900);
}

.contact-email-link {
  color: var(--cyan-600);
  font-size: 1.15rem;
  font-weight: 700;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.contact-email-link:hover {
  color: var(--cyan-500);
  text-decoration: underline;
}

.contact-badge-reply {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--accent-green);
  background: var(--accent-green-bg);
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-full);
  margin-top: 0.5rem;
}

/* Contact Form Component */
.contact-form-card {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border-light);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow-lg);
}

@media (min-width: 640px) {
  .contact-form-card {
    padding: 3rem 2.5rem;
  }
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--navy-900);
  margin-bottom: 0.5rem;
}

.form-label .req {
  color: #EF4444;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  border: 1.5px solid var(--border-medium);
  background: #FFFFFF;
  color: var(--navy-900);
  font-size: 1rem;
  transition: all var(--transition-fast);
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--cyan-500);
  box-shadow: 0 0 0 4px var(--cyan-glow);
  outline: none;
}

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

/* Anti-spam honeypot */
.form-hp {
  display: none !important;
  visibility: hidden;
}

.form-submit-btn {
  width: 100%;
  padding: 1rem 2rem;
  font-size: 1.0625rem;
  font-weight: 700;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  background: linear-gradient(135deg, var(--cyan-500) 0%, var(--cyan-600) 100%);
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  box-shadow: var(--shadow-cyan);
  transition: all var(--transition-normal);
}

.form-submit-btn:hover:not(:disabled) {
  background: linear-gradient(135deg, var(--cyan-400) 0%, var(--cyan-500) 100%);
  transform: translateY(-2px);
  box-shadow: 0 10px 25px -4px rgba(0, 184, 196, 0.45);
}

.form-submit-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.form-privacy-note {
  font-size: 0.8125rem;
  color: var(--text-subtle);
  margin-top: 1.25rem;
  line-height: 1.5;
  text-align: center;
}

.form-privacy-note a {
  color: var(--cyan-600);
  text-decoration: underline;
}

/* Status Notifications */
.form-alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  display: none;
  font-size: 0.9375rem;
  line-height: 1.5;
}

.form-alert.success {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background-color: #ECFDF5;
  border: 1px solid #A7F3D0;
  color: #065F46;
}

.form-alert.error {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background-color: #FEF2F2;
  border: 1px solid #FECACA;
  color: #991B1B;
}

/* Spinner */
.spinner {
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #FFFFFF;
  animation: spin 0.8s linear infinite;
  display: none;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.form-submit-btn.loading .spinner {
  display: block;
}

.form-submit-btn.loading .btn-text {
  opacity: 0.8;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background-color: var(--navy-950);
  color: var(--text-inverse-muted);
  padding-top: 5rem;
  padding-bottom: 3rem;
  border-top: 1px solid var(--border-dark);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3.5rem;
  padding-bottom: 4rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.footer-logo-img {
  height: 48px;
  width: auto;
  object-fit: contain;
}

.footer-slogan {
  font-size: 1.125rem;
  color: #FFFFFF;
  font-weight: 600;
}

.footer-desc {
  font-size: 0.9375rem;
  color: var(--text-inverse-muted);
  line-height: 1.55;
  max-width: 340px;
}

.footer-nav-col h5 {
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #FFFFFF;
  margin-bottom: 1.25rem;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link {
  font-size: 0.9375rem;
  color: var(--text-inverse-muted);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--cyan-400);
}

.footer-contact-address {
  font-size: 0.9375rem;
  color: var(--text-inverse-muted);
  line-height: 1.6;
}

.footer-contact-address strong {
  color: #FFFFFF;
}

.footer-email-link {
  color: var(--cyan-400);
  font-weight: 600;
}

.footer-bottom {
  padding-top: 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
  }
}

.footer-copyright {
  font-size: 0.875rem;
  color: #64748B;
}

.footer-bottom-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.footer-bottom-links a {
  font-size: 0.875rem;
  color: #94A3B8;
}

.footer-bottom-links a:hover {
  color: var(--cyan-400);
}

/* ==========================================================================
   Project Details Modal
   ========================================================================== */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(11, 25, 44, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-backdrop.open {
  opacity: 1;
  visibility: visible;
}

.modal-window {
  background: #FFFFFF;
  border-radius: var(--radius-xl);
  max-width: 760px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-2xl);
  position: relative;
  transform: translateY(20px) scale(0.97);
  transition: all var(--transition-normal);
}

.modal-backdrop.open .modal-window {
  transform: translateY(0) scale(1);
}

.modal-close-btn {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(11, 25, 44, 0.08);
  color: var(--navy-900);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  transition: all var(--transition-fast);
}

.modal-close-btn:hover {
  background: var(--navy-900);
  color: #FFFFFF;
}

.modal-preview-img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  background-color: var(--navy-900);
}

.modal-content-inner {
  padding: 2.25rem 2rem 2.5rem;
}

.modal-tag {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--cyan-600);
  margin-bottom: 0.5rem;
}

.modal-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--navy-900);
  margin-bottom: 0.35rem;
}

.modal-subtitle {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--cyan-600);
  margin-bottom: 1.5rem;
}

.modal-desc {
  font-size: 1rem;
  color: var(--text-muted);
  line-height: 1.65;
  margin-bottom: 1.75rem;
}

.modal-feature-heading {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--navy-900);
  margin-bottom: 0.85rem;
}

.modal-features-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
  margin-bottom: 2rem;
}

@media (min-width: 640px) {
  .modal-features-list {
    grid-template-columns: 1fr 1fr;
  }
}

.modal-feature-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.9375rem;
  color: var(--text-main);
}

.modal-feature-item svg {
  color: var(--cyan-500);
  flex-shrink: 0;
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-light);
}

/* ==========================================================================
   Legal Pages (Impressum & Datenschutz)
   ========================================================================== */

.legal-page {
  background-color: var(--bg-page);
  min-height: 100vh;
}

.legal-header {
  padding-top: calc(var(--header-height) + 3rem);
  padding-bottom: 3rem;
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-light);
}

.legal-back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.legal-back-link:hover {
  color: var(--cyan-600);
}

.legal-title {
  font-size: 2.75rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  color: var(--navy-900);
  margin-bottom: 0.75rem;
}

.legal-subtitle {
  font-size: 1.125rem;
  color: var(--text-muted);
}

.legal-content-card {
  background: #FFFFFF;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  padding: 3rem 2.5rem;
  margin-block: 3.5rem;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 640px) {
  .legal-content-card {
    padding: 2rem 1.5rem;
  }
}

.legal-content-card h2 {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--navy-900);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-light);
}

.legal-content-card h2:first-of-type {
  margin-top: 0;
}

.legal-content-card h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--navy-850);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.legal-content-card p {
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.legal-content-card ul {
  list-style: disc;
  padding-left: 1.5rem;
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.legal-content-card li {
  margin-bottom: 0.4rem;
}

.legal-box-highlight {
  background: var(--bg-surface-muted);
  border-left: 4px solid var(--cyan-500);
  padding: 1.25rem 1.5rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-block: 1.5rem;
  color: var(--navy-900);
  font-size: 0.95rem;
}

/* ==========================================================================
   Scroll Reveal Animations
   ========================================================================== */

.fade-in-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: opacity, transform;
}

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

/* Delay modifiers */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* Accessible reduced motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .fade-in-up {
    opacity: 1 !important;
    transform: none !important;
  }
  .floating-tile, .hero-logo-img {
    animation: none !important;
  }
}