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

:root {
  --bg-color: #000000;
  --accent-color: #50C878;
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --grid-color: rgba(80, 200, 120, 0.05); /* very subtle emerald */
  --border-color: rgba(255, 255, 255, 0.1);
  --font-sans: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
}

/* Blueprint Grid Background */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 40px 40px;
  z-index: -1;
  pointer-events: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1rem;
}

h1 { font-size: clamp(3rem, 8vw, 6rem); letter-spacing: -0.05em; }
h2 { font-size: clamp(2rem, 5vw, 4rem); letter-spacing: -0.03em; }

p {
  margin-bottom: 1.5rem;
  color: var(--text-secondary);
}

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

.mono {
  font-family: var(--font-mono);
}

.accent {
  color: var(--accent-color);
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

section {
  padding: 8rem 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Navigation - Glassmorphism & Glitch Underline */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  will-change: transform;
}

.nav-brand {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-brand span {
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-secondary);
  position: relative;
  transition: color 0.3s ease;
  padding: 0.5rem 0;
}

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

/* Slide-Underline / Glitch Effect */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: var(--accent-color);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.4s cubic-bezier(0.86, 0, 0.07, 1);
  will-change: transform;
}

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

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Sub-Navigation for Blog & Lab */
.sub-nav {
  position: sticky;
  top: 80px;
  background: rgba(0, 0, 0, 0.9);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  z-index: 990;
  display: flex;
  justify-content: center;
  gap: 2rem;
  backdrop-filter: blur(8px);
}

.sub-nav a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

.sub-nav a:hover {
  color: var(--accent-color);
}

/* Buttons */
.btn {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  padding: 1rem 2rem;
  border: 1px solid var(--border-color);
  background: transparent;
  color: var(--text-primary);
  transition: all 0.3s ease;
  cursor: pointer;
  text-transform: uppercase;
  will-change: transform, background-color;
}

.btn:hover {
  background: var(--accent-color);
  border-color: var(--accent-color);
  color: var(--bg-color);
  transform: translateY(-2px);
}

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

/* Status Indicator Footer */
.footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-color);
}

.status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--accent-color);
  box-shadow: 0 0 8px var(--accent-color);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
  100% { opacity: 1; transform: scale(1); }
}

/* Component specifics */
.hero {
  align-items: flex-start;
  padding-top: 12rem;
}

.hero-subtitle {
  font-family: var(--font-mono);
  color: var(--accent-color);
  letter-spacing: 0.1em;
  font-size: 0.9rem;
  margin-bottom: 2rem;
  display: block;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin-top: 4rem;
}

.card {
  border: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.02);
  padding: 2rem;
  transition: transform 0.3s ease, border-color 0.3s ease;
  will-change: transform;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent-color);
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-color);
  margin-bottom: 1rem;
  display: inline-block;
}

.card-title {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* simple mobile hide for now, could expand to toggle */
  }
  .menu-toggle {
    display: block;
  }
  .sub-nav {
    flex-wrap: wrap;
    padding: 1rem;
  }
  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  section { padding: 6rem 0; }
  .footer {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* Navigation Dropdowns */
.nav-item-dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  background: rgba(0, 0, 0, 0.95);
  border: 1px solid var(--border-color);
  backdrop-filter: blur(8px);
  min-width: 250px;
  list-style: none;
  padding: 1rem 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s cubic-bezier(0.86, 0, 0.07, 1);
  z-index: 1000;
  will-change: transform, opacity;
}

.nav-item-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-menu li {
  padding: 0;
}

.dropdown-menu a {
  display: block;
  padding: 0.5rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  transition: all 0.2s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dropdown-menu a:hover {
  color: var(--accent-color);
  background: rgba(80, 200, 120, 0.1);
  padding-left: 2rem;
}

/* Card Image Styles */
.card-img-container {
  width: 100%;
  height: 200px;
  overflow: hidden;
  margin-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-top: -2rem;
  margin-left: -2rem;
  margin-right: -2rem;
  width: calc(100% + 4rem);
}

.card-img-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card-img-container img {
  transform: scale(1.05);
}

/* Viewer Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }
.delay-4 { animation-delay: 0.4s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}