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

:root {
  /* Colors: Digital Architect - Deep Space */
  --surface: #0e0e0e;
  --surface-container-lowest: #000000;
  --surface-container-low: #131313;
  --surface-container: #1a1a1a;
  --surface-container-high: #20201f;
  --surface-container-highest: #262626;
  --surface-bright-rgb: 44, 44, 44; 
  /* #2c2c2c in RGB for rgba transparency */
  --surface-bright: rgba(var(--surface-bright-rgb), 0.6);

  --primary: #a0ffc3;
  --primary-container: #00fc9b;
  --primary-dim: #00ec91;
  --on-primary: #00643a;
  --on-primary-container: #005b34;
  
  --secondary: #e5e2e1;
  --secondary-container: #474746;

  --tertiary: #78dfff;
  --tertiary-container: #0fd5ff;
  
  --on-surface: #ffffff;
  --on-surface-variant: #adaaaa;
  
  --outline: #767575;
  --outline-variant: rgba(72, 72, 71, 0.2); /* #484847 at 20% opacity */

  /* Typography */
  --font-heading: 'Space Grotesk', sans-serif;
  --font-body: 'Manrope', sans-serif;
  
  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.75rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Spacing */
  --spacing-4: 1rem;
  --spacing-8: 2rem;
  --spacing-12: 3rem;
  --spacing-16: 4rem;
  --spacing-24: 6rem;
  --spacing-32: 8rem;
}

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

body {
  font-family: var(--font-body);
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.6;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Typography Utility Classes */
.display-lg {
  font-family: var(--font-heading);
  font-size: clamp(3rem, 5vw + 1rem, 5.5rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.headline-md {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 3vw + 1rem, 3.5rem);
  font-weight: 600;
  line-height: 1.2;
}

.title-sm {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 500;
}

.body-lg {
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--on-surface-variant);
  max-width: 65ch;
}

.body-md {
  font-size: 1rem;
  font-weight: 400;
  color: var(--on-surface-variant);
}

.label-md {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--on-surface-variant);
}

.label-sm {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--on-surface-variant);
}

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

/* Tonal Layering Utilities */
.surface { background-color: var(--surface); }
.surface-container-lowest { background-color: var(--surface-container-lowest); }
.surface-container-low { background-color: var(--surface-container-low); padding: var(--spacing-16) 0;}
.surface-container { background-color: var(--surface-container); padding: var(--spacing-16) 0;}
.surface-container-high { background-color: var(--surface-container-high); }
.surface-container-highest { background-color: var(--surface-container-highest); }

/* Glassmorphism */
.glass-nav {
  background-color: var(--surface-bright);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--spacing-4) 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--outline-variant); /* Ghost border allowed for sticky nav */
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.5rem;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 1rem;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
  color: var(--on-primary);
  box-shadow: 0px 4px 20px rgba(0, 252, 155, 0.15); /* Tech LED glow */
}

.btn-primary:hover {
  background: var(--primary-container);
  transform: translateY(-2px);
  box-shadow: 0px 8px 25px rgba(0, 252, 155, 0.25);
}

.btn-secondary {
  background-color: transparent;
  color: var(--secondary);
  border: 2px solid var(--outline-variant); /* Ghost border */
}

.btn-secondary:hover {
  background-color: var(--surface-container-highest);
  border-color: var(--outline-variant);
}

.btn-tertiary {
  background-color: transparent;
  color: var(--tertiary);
  padding: 0.5rem 0;
}

.btn-tertiary:hover {
  color: var(--tertiary-container);
}

/* Layout Utilities */
.container {
  width: 90%;
  max-width: 1400px;
  margin: 0 auto;
}

.grid {
  display: grid;
  gap: var(--spacing-8);
}

.grid-2 {
  grid-template-columns: 1fr;
}

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

@media (min-width: 768px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Navigation Specifics */
.nav-brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--on-surface);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: var(--spacing-8);
  list-style: none;
}

.nav-link {
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  transition: color 0.3s ease;
}

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

/* Code Badge */
.code-badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  background-color: var(--secondary-container);
  color: var(--on-surface);
  border-radius: var(--radius-full);
}

/* Section Margins */
.section {
  padding-top: var(--spacing-24);
  padding-bottom: var(--spacing-24);
}

/* Intentional Asymmetry utility */
@media (min-width: 1024px) {
  .offset-right {
    margin-left: 10%;
  }
}

/* Ambient shadow for floating components */
.ambient-shadow {
  box-shadow: 0px 20px 40px rgba(0, 0, 0, 0.4);
}

/* Custom Selection */
::selection {
  background: var(--primary);
  color: var(--on-primary);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--surface); 
}
::-webkit-scrollbar-thumb {
  background: var(--surface-container-high); 
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--outline); 
}

/* Animations */
.fade-in-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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