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

/* CSS Variables for Dark SaaS Aesthetic */
:root {
  /* Colors */
  --bg-base: #050505;
  --bg-surface: #111111;
  --bg-surface-elevated: #1a1a1a;
  
  --text-primary: #ffffff;
  --text-secondary: #a3a3a3;
  --text-tertiary: #737373;
  
  --accent-primary: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.4);
  
  --border-subtle: #262626;

  /* Typography */
  --font-main: 'Inter', sans-serif;
  
  /* Space */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  --spacing-xxl: 10rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

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

ul {
  list-style: none;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

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 {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.text-gradient {
  background: linear-gradient(135deg, #ffffff 0%, #a3a3a3 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

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

/* Layout Utilities */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

.section-full {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

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

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.text-center {
  text-align: center;
}

/* UI Components */

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-sm) 0;
  background: rgba(5, 5, 5, 0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 1000;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.header.scrolled {
  border-bottom: 1px solid var(--border-subtle);
}

.nav {
  display: flex;
  gap: var(--spacing-md);
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
}

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

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 1.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: none;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: #fff;
  box-shadow: 0 4px 14px 0 var(--accent-glow);
}

.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px 0 var(--accent-glow);
}

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

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

/* Cards & Glassmorphism */
.glass-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  transition: all var(--transition-fast);
}

.glass-card:hover {
  background: var(--bg-surface-elevated);
  border-color: var(--text-tertiary);
  transform: translateY(-4px);
}

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

/* Footer */
.footer {
  padding: var(--spacing-lg) 0 var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
}

.footer-top {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
}

.footer-col h4 {
  font-size: 1.125rem;
  margin-bottom: var(--spacing-sm);
}

.footer-col ul li {
  margin-bottom: var(--spacing-xs);
}

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

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  text-align: center;
  color: var(--text-tertiary);
  font-size: 0.875rem;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--border-subtle);
}

/* Responsive */
@media (max-width: 768px) {
  .nav {
    display: none; /* Hide for mobile initially, to be toggled by JS */
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-base);
    flex-direction: column;
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-subtle);
  }
  
  .nav.active {
    display: flex;
  }
  
  .mobile-menu-btn {
    display: block;
  }
  
  .header .flex-between > .btn {
    display: none; /* Hide CTA button on mobile header to save space */
  }
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.animate-fade-up {
  opacity: 0;
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.delay-100 { animation-delay: 100ms; }
.delay-200 { animation-delay: 200ms; }
.delay-300 { animation-delay: 300ms; }

/* Scroll Reveal Classes */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

.glass-card {
  /* Enhance glass card hover effect */
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}
.glass-card:hover {
  box-shadow: 0 10px 40px rgba(37, 99, 235, 0.15);
  border-color: var(--accent-primary);
}