/* ==========================================================================
   NovaLab — Modern Responsive CSS Design System
   Sleek Dark Mode, Glassmorphism, Micro-Animations & Responsive Grid
   ========================================================================== */

:root {
  /* Kleurenpalet (Dark Theme Default) */
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: rgba(17, 24, 39, 0.75);
  --bg-card-hover: rgba(30, 41, 59, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(56, 189, 248, 0.4);

  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  --accent-cyan: #38bdf8;
  --accent-blue: #3b82f6;
  --accent-indigo: #6366f1;
  --accent-purple: #a855f7;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;

  --gradient-brand: linear-gradient(135deg, #38bdf8 0%, #6366f1 50%, #a855f7 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0) 100%);

  /* Typografie & Spacing */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --radius-full: 9999px;

  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.35);
  --shadow-glow: 0 0 30px rgba(56, 189, 248, 0.15);
  --transition-normal: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme Override */
[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: rgba(255, 255, 255, 0.98);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-hover: rgba(14, 165, 233, 0.4);

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;

  --gradient-brand: linear-gradient(135deg, #0284c7 0%, #4f46e5 50%, #7c3aed 100%);
  --gradient-card: linear-gradient(180deg, rgba(255, 255, 255, 0.9) 0%, rgba(241, 245, 249, 0.8) 100%);
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.06);
  --shadow-glow: 0 0 25px rgba(14, 165, 233, 0.12);
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

body {
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Canvas Achtergrond */
#particle-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.45;
}

/* Algemene Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

/* Navigatiebalk */
.navbar {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition-normal);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo-icon {
  font-size: 1.4rem;
  filter: drop-shadow(0 0 10px var(--accent-cyan));
}

.brand-logo strong {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-normal);
  position: relative;
  padding: 4px 0;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-brand);
  transition: var(--transition-normal);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Knoppen */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 22px;
  border-radius: var(--radius-full);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-normal);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--gradient-brand);
  color: #ffffff;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(56, 189, 248, 0.45);
}

.btn-outline {
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: var(--accent-cyan);
  transform: translateY(-2px);
}

.btn-sm {
  padding: 6px 16px;
  font-size: 0.85rem;
}

.btn-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.1rem;
  transition: var(--transition-normal);
}

.btn-icon:hover {
  border-color: var(--accent-cyan);
  background: var(--bg-card-hover);
  transform: scale(1.05);
}

/* Hero Sectie */
.hero-section {
  padding: 90px 0 60px;
  text-align: center;
  position: relative;
}

.hero-container {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: var(--radius-full);
  color: var(--accent-cyan);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
  animation: pulseGlow 3s infinite;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-cyan);
  box-shadow: 0 0 10px var(--accent-cyan);
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  margin-bottom: 20px;
  max-width: 850px;
}

.gradient-text {
  background: var(--gradient-brand);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 680px;
  margin-bottom: 40px;
  line-height: 1.7;
}

.hero-stats {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 40px;
}

.stat-card {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  padding: 16px 24px;
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-width: 180px;
  box-shadow: var(--shadow-subtle);
  transition: var(--transition-normal);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.stat-number {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--accent-cyan);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.hero-cta {
  display: flex;
  gap: 16px;
}

/* Secties Algemeen */
.section {
  padding: 70px 0;
  position: relative;
  z-index: 1;
}

.section-header {
  text-align: center;
  margin-bottom: 45px;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 8px;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}

.section-description {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 550px;
  margin: 0 auto;
}

/* Project Filters */
.filter-group {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 35px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 8px 18px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-normal);
}

.filter-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-hover);
}

.filter-btn.active {
  background: var(--accent-cyan);
  color: #0a0e17;
  font-weight: 600;
  border-color: var(--accent-cyan);
  box-shadow: 0 0 15px rgba(56, 189, 248, 0.4);
}

/* Projects Grid */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}

.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  position: relative;
  display: flex;
  flex-direction: column;
  transition: var(--transition-normal);
  box-shadow: var(--shadow-subtle);
  overflow: hidden;
}

.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--gradient-brand);
  opacity: 0;
  transition: var(--transition-normal);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-glow);
}

.project-card:hover::before {
  opacity: 1;
}

.card-badge {
  position: absolute;
  top: 20px;
  right: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-color);
  color: var(--accent-cyan);
}

.card-icon {
  font-size: 2.2rem;
  margin-bottom: 18px;
}

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.card-text {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: 22px;
  flex-grow: 1;
}

.card-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.8rem;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
}

/* Simulator / Interactive Section */
.simulator-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 28px;
  align-items: center;
}

@media (max-width: 860px) {
  .simulator-card {
    grid-template-columns: 1fr;
  }
}

.simulator-controls {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.control-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-item label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.control-item label span {
  color: var(--accent-cyan);
}

.control-item input[type="range"] {
  width: 100%;
  accent-color: var(--accent-cyan);
  cursor: pointer;
}

.form-select {
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--accent-cyan);
}

.control-actions {
  display: flex;
  gap: 10px;
  margin-top: 8px;
}

.simulator-display {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#interactive-canvas {
  width: 100%;
  height: 320px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  display: block;
}

.canvas-overlay-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.badge-active {
  color: var(--accent-emerald);
}

/* Specs Matrix */
.specs-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
}

.spec-card {
  background: var(--bg-card);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-color);
  padding: 24px;
  border-radius: var(--radius-md);
  transition: var(--transition-normal);
}

.spec-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
}

.spec-icon {
  font-size: 2rem;
  margin-bottom: 14px;
}

.spec-card h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.spec-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* About Sectie */
.about-container {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
}

.text-body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  max-width: 800px;
}

.check-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-emerald);
  font-weight: bold;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border-color);
  background: var(--bg-card);
  padding: 30px 0;
  margin-top: 60px;
  position: relative;
  z-index: 10;
}

.footer-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-brand {
  font-weight: 700;
  font-size: 1.1rem;
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 4px;
}

.status-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--accent-emerald);
  font-weight: 500;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-full);
}

.status-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-emerald);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-emerald);
}

/* Animaties */
@keyframes pulseGlow {
  0%, 100% {
    box-shadow: 0 0 10px rgba(56, 189, 248, 0.2);
  }
  50% {
    box-shadow: 0 0 20px rgba(56, 189, 248, 0.45);
  }
}

/* Responsive Aanpassingen */
@media (max-width: 768px) {
  .nav-menu {
    display: none;
  }
  .hero-section {
    padding: 60px 0 40px;
  }
  .hero-stats {
    flex-direction: column;
    width: 100%;
  }
  .stat-card {
    width: 100%;
  }
}