:root {
  /* Rugged High-End Expedition Color Palette */
  --color-bg-base: #0a0b0a;
  --color-bg-surface: #141614;
  --color-bg-elevated: #1e201e;
  
  --color-text-primary: #e6e8e6;
  --color-text-secondary: #9ea49e;
  --color-text-muted: #646a64;
  
  --color-accent-primary: #d4af37; /* Muted Gold/Bronze */
  --color-accent-hover: #b5952f;
  
  --color-terrain-dark: #121412;
  --color-terrain-light: #2a2c2a;
  
  /* Typography */
  --font-sans: 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
  
  /* Spacing System */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;
  
  /* Layout */
  --container-width: 1440px;
  --container-padding: 2rem;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast: 0.01s;
    --transition-smooth: 0.01s;
  }
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--color-bg-base);
  color: var(--color-text-primary);
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  opacity: 0; /* For smooth page transition */
  transition: opacity var(--transition-smooth);
}

body.page-loaded {
  opacity: 1;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

h1 { font-size: clamp(3rem, 6vw, 6rem); }
h2 { font-size: clamp(2rem, 4vw, 4rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2.5rem); }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-primary);
}

img {
  max-width: 100%;
  display: block;
  object-fit: cover;
}

/* Layout Modules */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section {
  padding: var(--space-xl) 0;
}

/* Navigation */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--space-md) 0;
  z-index: 100;
  mix-blend-mode: difference;
}

.site-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.1em;
}

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

.nav-links a {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

/* Grid Strategy 1: Asymmetric Split (Home Hero) */
.grid-asymmetric {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-md);
  min-height: 80vh;
  align-items: end;
  padding-bottom: var(--space-lg);
}

/* Grid Strategy 2: Modular Cards (Services/Courses) */
.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-md);
}

/* Grid Strategy 3: Alternating Row (Stories/Expeditions) */
.grid-alternating {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.grid-alternating .row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}

.grid-alternating .row:nth-child(even) .content {
  order: -1;
}

/* UI Elements */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  background-color: var(--color-accent-primary);
  color: var(--color-bg-base);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: none;
  cursor: pointer;
  transition: transform var(--transition-fast), background-color var(--transition-fast);
}

.btn:hover {
  background-color: var(--color-accent-hover);
  /* transform is handled by JS for magnetic effect */
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-text-primary);
  color: var(--color-text-primary);
}

.btn-outline:hover {
  background-color: var(--color-text-primary);
  color: var(--color-bg-base);
}

/* Typography Utilities */
.text-mono {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-secondary);
}

/* Effects & State Classes */
.hidden {
  opacity: 0;
  visibility: hidden;
}

/* Section Transitions (Focus Lock) */
.section-transition-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: var(--color-bg-base);
  z-index: 999;
  transform: scaleY(0);
  transform-origin: top;
  transition: transform 0.8s cubic-bezier(0.77, 0, 0.175, 1);
  pointer-events: none;
}

.is-transitioning .section-transition-overlay {
  transform: scaleY(1);
  transform-origin: bottom;
}

/* Responsive */
@media (max-width: 1024px) {
  :root {
    --space-xl: 6rem;
  }
  .grid-asymmetric {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 15vh;
  }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 4rem;
  }
  .nav-links {
    display: none; /* Mobile menu needed */
  }
  .grid-alternating .row {
    grid-template-columns: 1fr;
  }
  .grid-alternating .row:nth-child(even) .content {
    order: unset;
  }
  h1 { font-size: 2.5rem; }
}