/* ============================================
   QUANTUM AI ADDITIVE MANUFACTURING ACADEMY
   Production-Ready Stylesheet
   ============================================ */

/* 1. Design Tokens & Variables
   ------------------------------------------ */
:root {
  --color-bg: #060610;
  --color-surface: #0c0c1a;
  --color-surface-raised: #131326;
  --color-glass: rgba(255, 255, 255, 0.035);
  --color-glass-border: rgba(255, 255, 255, 0.08);
  --color-cyan: #00f0ff;
  --color-cyan-dim: rgba(0, 240, 255, 0.12);
  --color-violet: #8b5cf6;
  --color-violet-deep: #7c3aed;
  --color-magenta: #d946ef;
  --color-text: #f8fafc;
  --color-text-muted: #94a3b8;
  --font-body: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Orbitron', 'Inter', sans-serif;
  --radius: 1.25rem;
  --header-height: 5rem;
  --transition-base: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-slow: 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

/* 2. Base & Reset
   ------------------------------------------ */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

ul {
  list-style: none;
}

address {
  font-style: normal;
}

button {
  font-family: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

/* 3. Typography
   ------------------------------------------ */
h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.75rem);
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.5rem);
}

h3 {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.gradient-text {
  background: linear-gradient(135deg, var(--color-cyan), var(--color-violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 4. Utilities & Shared Components
   ------------------------------------------ */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.section {
  padding-block: 7rem;
  position: relative;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin-inline: auto;
  margin-bottom: 4rem;
}

.section-header h2 {
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--color-text-muted);
  font-size: 1.15rem;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--color-cyan);
  margin-bottom: 1rem;
  border: 1px solid var(--color-cyan-dim);
  padding: 0.4rem 1rem;
  border-radius: 999px;
}

.glass-card {
  background: var(--color-glass);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius);
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s var(--transition-slow), transform 0.9s var(--transition-slow);
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* 5. Header & Navigation
   ------------------------------------------ */
.main-header {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--header-height);
  z-index: 1000;
  display: flex;
  align-items: center;
  transition: background var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  border-bottom: 1px solid transparent;
}

.main-header.scrolled {
  background: rgba(6, 6, 16, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-glass-border);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

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

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  width: 2.5rem;
  height: 2.5rem;
  display: grid;
  place-items: center;
  border: 2px solid var(--color-cyan);
  color: var(--color-cyan);
  border-radius: 0.5rem;
  font-size: 1.1rem;
}

.logo-highlight {
  color: var(--color-cyan);
}

.main-nav {
  display: flex;
}

.nav-list {
  display: flex;
  gap: 2.5rem;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  padding-block: 0.5rem;
  transition: color var(--transition-base);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-violet));
  transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--color-text);
}

.nav-link:hover::after,
.nav-link:focus::after {
  width: 100%;
}

.mobile-nav-toggle {
  display: none;
  padding: 0.5rem;
  z-index: 1001;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 1.5rem;
  height: 2px;
  background-color: var(--color-text);
  border-radius: 2px;
  transition: transform var(--transition-base), background-color var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before {
  top: -6px;
}

.hamburger::after {
  top: 6px;
}

/* 6. Hero Section
   ------------------------------------------ */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding-block: 7rem 4rem;
}

#hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, transparent 0%, var(--color-bg) 120%);
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 900px;
  padding-inline: 1.5rem;
}

.hero-card {
  padding: 3.5rem 2.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.75rem;
  text-align: center;
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.07);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  color: var(--color-cyan);
  background: var(--color-cyan-dim);
  border: 1px solid rgba(0, 240, 255, 0.25);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
}

.badge-dot {
  width: 0.4rem;
  height: 0.4rem;
  background: var(--color-cyan);
  border-radius: 50%;
  animation: pulseDot 2s ease-in-out infinite;
}

.hero-title {
  max-width: 700px;
}

.hero-subtitle {
  color: var(--color-text-muted);
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  max-width: 580px;
  line-height: 1.7;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 2.25rem;
  border-radius: 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-violet-deep) 0%, var(--color-violet) 100%);
  color: var(--color-text);
  box-shadow: 0 0 30px rgba(139, 92, 246, 0.35), 0 8px 16px rgba(0, 0, 0, 0.3);
}

.btn-primary:hover,
.btn-primary:focus {
  transform: translateY(-2px);
  box-shadow: 0 0 45px rgba(0, 240, 255, 0.35), 0 12px 24px rgba(0, 0, 0, 0.35);
}

.glow-effect::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: linear-gradient(135deg, var(--color-cyan) 0%, transparent 50%, var(--color-violet) 100%);
  z-index: -1;
  opacity: 0;
  transition: opacity var(--transition-base);
}

.glow-effect:hover::before,
.glow-effect:focus::before {
  opacity: 0.6;
}

.icon-arrow {
  transition: transform var(--transition-base);
}

.btn-primary:hover .icon-arrow,
.btn-primary:focus .icon-arrow {
  transform: translateX(4px);
}

.scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

.scroll-indicator:hover {
  color: var(--color-cyan);
}

.mouse {
  display: block;
  width: 26px;
  height: 42px;
  border: 2px solid currentColor;
  border-radius: 13px;
  opacity: 0.5;
  position: relative;
}

.mouse::after {
  content: '';
  position: absolute;
  top: 7px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: currentColor;
  border-radius: 2px;
  animation: scrollWheel 2s ease-in-out infinite;
}

/* 7. Über die Akademie
   ------------------------------------------ */
.ueber {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
}

.ueber-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
  align-items: center;
}

.ueber-text p {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-top: 2rem;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-weight: 500;
}

.feature-icon {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  background: rgba(0, 240, 255, 0.08);
  color: var(--color-cyan);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 1px solid rgba(0, 240, 255, 0.15);
}

/* Animated Printer Graphic */
.ueber-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.printer-graphic {
  position: relative;
  width: 260px;
  height: 340px;
}

.printer-rail {
  position: absolute;
  top: 50px;
  left: 10%;
  width: 80%;
  height: 3px;
  background: rgba(255, 255, 255, 0.12);
  border-radius: 2px;
}

.printer-head {
  position: absolute;
  top: 42px;
  left: 50%;
  width: 48px;
  height: 22px;
  margin-left: -24px;
  background: linear-gradient(135deg, var(--color-violet), var(--color-cyan));
  border-radius: 4px;
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
  animation: printHead 4s ease-in-out infinite;
}

.printer-nozzle {
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 6px;
  height: 12px;
  background: var(--color-cyan);
  border-radius: 0 0 3px 3px;
  box-shadow: 0 0 12px var(--color-cyan);
}

.build-plate {
  position: absolute;
  bottom: 40px;
  left: 15%;
  width: 70%;
  height: 8px;
  background: rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
}

.print-layer {
  position: absolute;
  left: 18%;
  width: 64%;
  height: 6px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-violet));
  border-radius: 3px;
  opacity: 0;
  transform: scaleX(0);
  transform-origin: left;
  box-shadow: 0 0 10px rgba(0, 240, 255, 0.35);
}

.print-layer:nth-child(4) {
  bottom: 52px;
  animation: printLayer 2.5s 0s forwards;
}

.print-layer:nth-child(5) {
  bottom: 62px;
  animation: printLayer 2.5s 2.5s forwards;
}

.print-layer:nth-child(6) {
  bottom: 72px;
  animation: printLayer 2.5s 5s forwards;
}

.print-layer:nth-child(7) {
  bottom: 82px;
  animation: printLayer 2.5s 7.5s forwards;
}

.print-layer:nth-child(8) {
  bottom: 92px;
  animation: printLayer 2.5s 10s forwards;
}

.printer-glow {
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(0, 240, 255, 0.25) 0%, transparent 70%);
  filter: blur(20px);
  pointer-events: none;
}

/* 8. Programme
   ------------------------------------------ */
.programme {
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.programme-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.programme-card {
  padding: 2.5rem 1.75rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
  position: relative;
  overflow: hidden;
}

.programme-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--color-cyan), var(--color-violet));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.6s var(--transition-base);
}

.programme-card:hover,
.programme-card:focus-within {
  transform: translateY(-8px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.45), 0 0 30px rgba(0, 240, 255, 0.08);
  border-color: rgba(0, 240, 255, 0.25);
}

.programme-card:hover::before,
.programme-card:focus-within::before {
  transform: scaleX(1);
}

.card-icon {
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 1rem;
  display: grid;
  place-items: center;
  margin-bottom: 1.75rem;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
}

.card-icon-violet {
  color: var(--color-violet);
  box-shadow: 0 0 20px rgba(139, 92, 246, 0.15);
}

.card-icon-cyan {
  color: var(--color-cyan);
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.15);
}

.card-icon-magenta {
  color: var(--color-magenta);
  box-shadow: 0 0 20px rgba(217, 70, 239, 0.15);
}

.card-icon-gradient {
  color: var(--color-violet);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(0, 240, 255, 0.1));
  box-shadow: 0 0 20px rgba(0, 240, 255, 0.1);
}

.programme-card h3 {
  margin-bottom: 0.75rem;
}

.programme-card p {
  color: var(--color-text-muted);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-cyan);
  transition: gap var(--transition-base);
}

.card-link svg {
  transition: transform var(--transition-base);
}

.programme-card:hover .card-link svg,
.programme-card:focus-within .card-link svg {
  transform: translateX(4px);
}

/* 9. Manufacturing Lab
   ------------------------------------------ */
.lab {
  background: var(--color-bg);
}

.lab-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.lab-item {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  cursor: pointer;
  border: 1px solid var(--color-glass-border);
  background: var(--color-surface);
  transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
}

.lab-item:hover,
.lab-item:focus {
  transform: translateY(-4px);
  border-color: rgba(0, 240, 255, 0.35);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 30px rgba(0, 240, 255, 0.12);
}

.lab-visual {
  width: 100%;
  height: 100%;
  position: relative;
  transition: transform 6s ease;
}

.lab-item:hover .lab-visual,
.lab-item:focus .lab-visual {
  transform: scale(1.08);
}

.lab-visual-1 {
  background: radial-gradient(circle at 30% 30%, rgba(0, 240, 255, 0.2), transparent), linear-gradient(135deg, #0f0f20, #060610);
}

.lab-visual-2 {
  background: radial-gradient(circle at 70% 70%, rgba(217, 70, 239, 0.2), transparent), linear-gradient(45deg, #0f0f20, #1a1030);
}

.lab-visual-3 {
  background: radial-gradient(circle at 50% 50%, rgba(139, 92, 246, 0.25), transparent), linear-gradient(to bottom right, #060610, #151530);
}

.lab-visual-4 {
  background: conic-gradient(from 0deg at 50% 50%, rgba(0, 240, 255, 0.15), rgba(139, 92, 246, 0.15), rgba(0, 240, 255, 0.15)), linear-gradient(135deg, #0f0f20, #060610);
}

.lab-visual-5 {
  background: radial-gradient(circle at 20% 80%, rgba(0, 240, 255, 0.2), transparent), linear-gradient(120deg, #0f0f20, #101025);
}

.lab-visual-6 {
  background: repeating-linear-gradient(45deg, rgba(0, 240, 255, 0.05) 0px, rgba(0, 240, 255, 0.05) 1px, transparent 1px, transparent 10px), linear-gradient(135deg, #060610, #151530);
}

.lab-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 1.75rem;
  background: linear-gradient(to top, rgba(6, 6, 16, 0.95) 0%, rgba(6, 6, 16, 0.6) 50%, transparent 100%);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.lab-item:hover .lab-overlay,
.lab-item:focus .lab-overlay {
  opacity: 1;
  transform: translateY(0);
}

.lab-overlay h3 {
  font-size: 1.15rem;
  color: var(--color-cyan);
  margin-bottom: 0.35rem;
}

.lab-overlay p {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* 10. Kontakt
   ------------------------------------------ */
.kontakt {
  background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-surface) 100%);
}

.kontakt-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.kontakt-card {
  padding: 3rem 2rem;
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}

.kontakt-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 240, 255, 0.25);
}

.kontakt-card h3 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: 1.25rem;
}

.kontakt-card a,
.kontakt-card address {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.6;
  transition: color var(--transition-base);
}

.kontakt-card a:hover,
.kontakt-card a:focus {
  color: var(--color-cyan);
}

/* 11. Footer
   ------------------------------------------ */
.main-footer {
  border-top: 1px solid var(--color-glass-border);
  padding-block: 3rem;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  background: var(--color-bg);
}

.footer-address {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  opacity: 0.7;
}

/* 12. Animations
   ------------------------------------------ */
@keyframes scrollWheel {
  0% {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateX(-50%) translateY(10px);
  }
}

@keyframes pulseDot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.8);
  }
}

@keyframes printHead {
  0% {
    left: 20%;
  }
  50% {
    left: 80%;
  }
  100% {
    left: 20%;
  }
}

@keyframes printLayer {
  0% {
    opacity: 0;
    transform: scaleX(0);
  }
  100% {
    opacity: 1;
    transform: scaleX(1);
  }
}

/* 13. Responsive Design
   ------------------------------------------ */
@media (max-width: 1024px) {
  .programme-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .lab-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .ueber-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .ueber-visual {
    order: -1;
  }
}

@media (max-width: 768px) {
  :root {
    --header-height: 4.5rem;
  }

  .section {
    padding-block: 5rem;
  }

  .mobile-nav-toggle {
    display: block;
  }

  .main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: rgba(6, 6, 16, 0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-glass-border);
    padding: 1.5rem;
    opacity: 0;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
  }

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

  .nav-list {
    flex-direction: column;
    gap: 1rem;
  }

  .hero-card {
    padding: 2.5rem 1.5rem;
  }

  .programme-grid,
  .lab-grid,
  .kontakt-grid {
    grid-template-columns: 1fr;
  }
}

/* 14. Accessibility – Reduced Motion
   ------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}