/* Vantage Design System - Mountain Theme */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700;800&display=swap');

:root {
  /* Colors - Light Theme (Alpine Day) */
  --bg-primary: #ffffff;
  --bg-secondary: #f1f5f9; /* cool gray */
  --bg-tertiary: #e2e8f0;
  --text-primary: #0f172a; /* deep slate */
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --border-color: #cbd5e1;
  --accent-color: #0284c7; /* deep glacier blue */
  --accent-text: #ffffff;
  --danger: #ef4444;
  
  /* Glassmorphism */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(15, 23, 42, 0.05);

  /* Typography */
  --font-sans: "Space Grotesk", -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 8rem;

  /* Layout */
  --container-width: 1200px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
}

@media (prefers-color-scheme: dark) {
  :root {
    /* Colors - Dark Theme (Midnight Summit) */
    --bg-primary: #020617; /* very dark slate */
    --bg-secondary: #0f172a; /* dark slate */
    --bg-tertiary: #1e293b;
    --text-primary: #f8fafc; /* ice white */
    --text-secondary: #94a3b8;
    --text-tertiary: #475569;
    --border-color: #334155;
    --accent-color: #38bdf8; /* bright glacier blue */
    --accent-text: #020617;
    
    /* Glassmorphism Dark */
    --glass-bg: rgba(2, 6, 23, 0.75);
    --glass-border: rgba(255, 255, 255, 0.1);
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

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

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

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

ul {
  list-style: none;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
p { font-size: 1.125rem; color: var(--text-secondary); margin-bottom: 1.5rem; }

.text-muted { color: var(--text-tertiary); }
.text-center { text-align: center; }

/* Layout */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

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

/* Header & Navigation */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: transparent;
  transition: background-color var(--transition-normal), backdrop-filter var(--transition-normal), border-bottom var(--transition-normal);
  border-bottom: 1px solid transparent;
}

header.scrolled {
  background-color: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--accent-color);
}

.nav-links {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.nav-links a {
  font-weight: 500;
  font-size: 1rem;
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: transform var(--transition-fast), opacity var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
  border: none;
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

.btn-primary {
  background-color: var(--accent-color);
  color: var(--accent-text);
  box-shadow: 0 4px 14px 0 rgba(2, 132, 199, 0.39);
}

.btn-primary:hover {
  opacity: 0.9;
  color: var(--accent-text);
  box-shadow: 0 6px 20px rgba(2, 132, 199, 0.23);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
}

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

/* Hero Section */
.hero {
  padding-top: 160px;
  padding-bottom: var(--space-xl);
  text-align: center;
  overflow: hidden;
  position: relative;
}

/* Subtle Mountain background element for hero */
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 150vw;
  height: 150vw;
  background: radial-gradient(circle, var(--accent-color) 0%, transparent 40%);
  opacity: 0.05;
  z-index: -1;
  border-radius: 50%;
}

.hero h1 {
  margin-bottom: var(--space-sm);
}

.hero p {
  max-width: 600px;
  margin: 0 auto var(--space-md);
  font-size: 1.25rem;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  margin-bottom: var(--space-xl);
}

/* Device Mockup (CSS only) */
.device-mockup {
  position: relative;
  width: 300px;
  height: 600px;
  margin: 0 auto;
  background-color: var(--bg-primary);
  border: 12px solid var(--border-color);
  border-radius: 40px;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  overflow: hidden;
}

.device-notch {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 120px;
  height: 25px;
  background-color: var(--border-color);
  border-bottom-left-radius: 16px;
  border-bottom-right-radius: 16px;
  z-index: 10;
}

.device-screen {
  width: 100%;
  height: 100%;
  background-color: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
  background-position: center;
}

.device-screen-placeholder {
  padding: 2rem;
  text-align: center;
  color: var(--text-tertiary);
}

/* Grid & Cards */
.grid {
  display: grid;
  gap: var(--space-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border-color: var(--accent-color);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
  display: inline-block;
}

.card h3 {
  margin-bottom: var(--space-xs);
  font-size: 1.5rem;
}

/* Feature Split */
.feature-split {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.feature-split:nth-child(even) {
  flex-direction: row-reverse;
}

.feature-content {
  flex: 1;
}

.feature-visual {
  flex: 1;
  display: flex;
  justify-content: center;
}

/* Document / Legal Pages */
.document-content {
  max-width: 800px;
  margin: 0 auto;
  background-color: var(--bg-secondary);
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.document-content h2 {
  margin-top: var(--space-md);
  margin-bottom: var(--space-xs);
}

.document-content ul, .document-content ol {
  margin-bottom: var(--space-sm);
  padding-left: var(--space-md);
  color: var(--text-secondary);
}

.document-content li {
  margin-bottom: var(--space-xs);
}

/* Footer */
footer {
  background-color: var(--bg-tertiary);
  padding: var(--space-lg) 0 var(--space-md);
  margin-top: auto;
  border-top: 1px solid var(--border-color);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.footer-brand p {
  max-width: 300px;
  margin-top: var(--space-sm);
}

.footer-links h4 {
  margin-bottom: var(--space-sm);
  font-size: 1.1rem;
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-links a {
  color: var(--text-secondary);
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-color);
  color: var(--text-tertiary);
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 900px) {
  .feature-split, .feature-split:nth-child(even) {
    flex-direction: column;
    text-align: center;
    gap: var(--space-md);
  }
}

@media (max-width: 768px) {
  :root {
    --space-xl: 4rem;
    --space-lg: 3rem;
  }
  
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  
  .footer-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
  
  .nav-links {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background-color: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--border-color);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-normal);
  }
  
  .nav-links.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  
  .menu-toggle {
    display: block;
  }
  
  .footer-bottom {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }
}