/* ==============================================================================
   Infranite Global - Landing Page Stylesheet
   Dark-first design tokens, fluid typography, responsive grid & accessibility
   ============================================================================== */

:root {
  /* Color Palette - Dark First */
  --bg-main: #0a0d14;
  --bg-surface: #121824;
  --bg-surface-elevated: #1a2335;
  --bg-surface-glass: rgba(18, 24, 36, 0.85);

  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent-primary: #38bdf8;
  --accent-hover: #0ea5e9;
  --accent-glow: rgba(56, 189, 248, 0.18);
  --accent-gradient: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);

  --border-subtle: #1e293b;
  --border-focus: #38bdf8;

  /* Typography Scale */
  --font-system: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: clamp(1.5rem, 3vw, 2rem);
  --text-3xl: clamp(2rem, 4vw, 2.75rem);
  --text-4xl: clamp(2.5rem, 6vw, 3.75rem);

  /* Spacing Scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;

  /* Layout & Radii */
  --max-width: 1200px;
  --header-height: 4.5rem;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;

  /* Transitions & Shadows */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 25px var(--accent-glow);
}

/* Light Scheme Preference Override */
@media (prefers-color-scheme: light) {
  :root {
    --bg-main: #f8fafc;
    --bg-surface: #ffffff;
    --bg-surface-elevated: #f1f5f9;
    --bg-surface-glass: rgba(255, 255, 255, 0.9);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;

    --accent-primary: #0284c7;
    --accent-hover: #0369a1;
    --accent-glow: rgba(2, 132, 199, 0.15);
    --accent-gradient: linear-gradient(135deg, #0284c7 0%, #6366f1 100%);

    --border-subtle: #e2e8f0;
    --border-focus: #0284c7;
    --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
  }
}

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

html {
  font-family: var(--font-system);
  background-color: var(--bg-main);
  color: var(--text-primary);
  scroll-behavior: smooth;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

button, input {
  font-family: inherit;
}

/* Accessible Focus Ring */
:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 3px;
}

/* Containers */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-6);
  padding-right: var(--space-6);
}

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: var(--bg-surface-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
}

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

.brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 700;
  font-size: var(--text-lg);
  letter-spacing: -0.02em;
}

.brand-icon {
  width: 32px;
  height: 32px;
  background: var(--accent-gradient);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ffffff;
  font-weight: 800;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

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

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

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

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

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: var(--text-base);
}

/* Mobile Nav Toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: var(--space-2);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.35rem 0.85rem;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--space-6);
}

.hero-title {
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-6);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-description {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}

.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Stats / Proof Strip
   -------------------------------------------------------------------------- */
.stats-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-12) 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  text-align: center;
}

.stat-value {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

/* --------------------------------------------------------------------------
   Features / "What We Do" Grid
   -------------------------------------------------------------------------- */
.section-padding {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto var(--space-16) auto;
}

.section-tag {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--accent-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-3);
  display: block;
}

.section-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: var(--text-base);
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-8);
}

.feature-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  transition: all var(--transition-normal);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent-primary);
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: var(--space-6);
}

.feature-title {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.feature-description {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Process / "How We Work" Band
   -------------------------------------------------------------------------- */
.process-section {
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
}

.process-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-8);
  position: relative;
}

.process-step {
  padding: var(--space-6);
  background: var(--bg-main);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
}

.step-number {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: var(--space-3);
}

.step-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.step-description {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   CTA Banner Band
   -------------------------------------------------------------------------- */
.cta-banner {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-16) var(--space-8);
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.cta-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.cta-description {
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-8) auto;
  font-size: var(--text-base);
}

/* --------------------------------------------------------------------------
   Footer & Legal Pages
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: auto;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-12) 0 var(--space-8) 0;
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer-link {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

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

.copyright {
  color: var(--text-muted);
  font-size: var(--text-sm);
}

/* Legal Page Layout */
.legal-container {
  max-width: 800px;
  margin: var(--space-16) auto;
  padding: 0 var(--space-6);
}

.legal-header {
  margin-bottom: var(--space-12);
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: var(--space-6);
}

.legal-title {
  font-size: var(--text-3xl);
  font-weight: 800;
  margin-bottom: var(--space-2);
}

.legal-meta {
  color: var(--text-muted);
  font-size: var(--text-sm);
}

.legal-content h2 {
  font-size: var(--text-xl);
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
  color: var(--text-primary);
}

.legal-content p {
  color: var(--text-secondary);
  margin-bottom: var(--space-4);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Scroll Animations & Reduced Motion
   -------------------------------------------------------------------------- */
.reveal-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-on-scroll.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .reveal-on-scroll {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn, .feature-card {
    transition: none;
  }
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  .nav-menu {
    display: none;
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border-subtle);
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
  }
  .nav-menu.is-open {
    display: flex;
  }
  .nav-actions {
    display: none;
  }
}