@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  --bg-primary: #0a0d14;
  --bg-secondary: #0f172a;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-glass: rgba(30, 41, 59, 0.5);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-active: rgba(99, 102, 241, 0.5);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-indigo: #6366f1;
  --accent-cyan: #06b6d4;
  --accent-emerald: #10b981;
  --accent-amber: #f59e0b;
  --accent-rose: #f43f5e;
  --accent-violet: #8b5cf6;
  
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --shadow-glow: 0 0 25px rgba(99, 102, 241, 0.25);
  --shadow-cyan-glow: 0 0 25px rgba(6, 182, 212, 0.25);
  --shadow-emerald-glow: 0 0 25px rgba(16, 185, 129, 0.25);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 9999px;
}

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

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  background-image: 
    radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.15) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(6, 182, 212, 0.12) 0px, transparent 50%),
    radial-gradient(at 50% 50%, rgba(139, 92, 246, 0.08) 0px, transparent 60%);
  background-attachment: fixed;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(10, 13, 20, 0.8);
  border-bottom: 1px solid var(--border-glass);
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.03em;
}

.brand-badge {
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-cyan));
  color: #fff;
  padding: 0.2rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  box-shadow: var(--shadow-glow);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.92rem;
  transition: all 0.2s ease;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-sm);
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text-main);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
}

.btn-cta {
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-violet));
  color: #fff !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2) !important;
}

.btn-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.6);
}

/* Hero Section */
.hero {
  padding: 5rem 2rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: rgba(99, 102, 241, 0.12);
  border: 1px solid rgba(99, 102, 241, 0.3);
  padding: 0.4rem 1.1rem;
  border-radius: var(--radius-full);
  color: #a5b4fc;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  animation: pulseGlow 3s infinite alternate;
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 10px rgba(99, 102, 241, 0.2); }
  100% { box-shadow: 0 0 22px rgba(99, 102, 241, 0.5); }
}

.hero-title {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  background: linear-gradient(135deg, #ffffff 30%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--text-muted);
  max-width: 780px;
  margin: 0 auto 2.5rem;
  font-weight: 400;
}

.hero-actions {
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 0.85rem 1.8rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  border: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-indigo), var(--accent-cyan));
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-glass);
}

.btn-secondary:hover {
  background: rgba(30, 41, 59, 0.9);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

/* Feature Cards Grid */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-tag {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-indigo), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-active);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.5), var(--shadow-glow);
}

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

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(99, 102, 241, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.25rem;
  border: 1px solid rgba(99, 102, 241, 0.25);
}

.card-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 0.6rem;
  color: var(--text-main);
}

.card-desc {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-glass);
  padding-top: 1rem;
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  background: rgba(6, 182, 212, 0.1);
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
}

.card-link {
  color: var(--accent-indigo);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: gap 0.2s ease;
}

.card:hover .card-link {
  gap: 0.5rem;
  color: #818cf8;
}

/* Metric Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  text-align: center;
}

.stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-emerald));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 0.3rem;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Interactive Playground Layout */
.playground-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 2rem;
}

@media (max-width: 992px) {
  .playground-layout {
    grid-template-columns: 1fr;
  }
}

.canvas-viewport {
  background: #000;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  overflow: hidden;
  position: relative;
  min-height: 480px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
}

.canvas-viewport canvas {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.viewport-overlay {
  position: absolute;
  top: 1rem;
  left: 1rem;
  display: flex;
  gap: 0.6rem;
  z-index: 10;
}

.overlay-badge {
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-glass);
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--text-main);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  animation: blink 2s infinite;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.control-panel {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.control-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
}

.control-value {
  color: var(--accent-cyan);
  font-family: var(--font-mono);
}

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

select, input[type="text"] {
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-main);
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s ease;
}

select:focus, input[type="text"]:focus {
  border-color: var(--accent-indigo);
}

.toggle-switch {
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.toggle-input {
  display: none;
}

.toggle-slider {
  width: 44px;
  height: 24px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  position: relative;
  transition: 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: white;
  top: 3px;
  left: 3px;
  transition: 0.3s;
}

.toggle-input:checked + .toggle-slider {
  background: var(--accent-indigo);
}

.toggle-input:checked + .toggle-slider::before {
  transform: translateX(20px);
}

/* Visualizer Canvas Containers */
.visualizer-canvas-container {
  width: 100%;
  height: 600px;
  background: radial-gradient(circle at center, #1e293b 0%, #0a0d14 100%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-glass);
  position: relative;
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.7);
}

.code-snippet {
  background: #060910;
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: #e2e8f0;
  overflow-x: auto;
  margin: 1.5rem 0;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-glass);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 4rem;
}

footer a {
  color: var(--accent-indigo);
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}