/* Zennthic Brand System - CSS */

/* ============================================================================
   Color Variables
   ============================================================================ */

:root {
  /* Primary Colors */
  --color-deep-slate: #0F172A;
  --color-graphite: #1E293B;

  /* Accent Colors */
  --color-electric-indigo: #6366F1;
  --color-cyan-signal: #06B6D4;

  /* Support Colors */
  --color-soft-white: #F8FAFC;
  --color-muted-gray: #94A3B8;

  /* Semantic Aliases */
  --bg-primary: var(--color-deep-slate);
  --bg-secondary: var(--color-graphite);
  --text-primary: var(--color-soft-white);
  --text-secondary: var(--color-muted-gray);
  --accent-primary: var(--color-electric-indigo);
  --accent-secondary: var(--color-cyan-signal);

  /* Typography */
  --font-family-primary: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-family-secondary: 'Space Grotesk', sans-serif;

  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;

  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;

  /* Shadows */
  --shadow-none: none;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.08);
  --shadow-md: 0 4px 6px rgba(15, 23, 42, 0.12);
}

/* ============================================================================
   Typography
   ============================================================================ */

html {
  font-size: 16px;
}

body {
  font-family: var(--font-family-primary);
  font-weight: var(--font-weight-regular);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  line-height: 1.5;
  margin: 0;
  padding: 0;
}

h1 {
  font-size: 48px;
  line-height: 56px;
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--spacing-md) 0;
}

h2 {
  font-size: 32px;
  line-height: 40px;
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--spacing-md) 0;
}

h3 {
  font-size: 24px;
  line-height: 32px;
  font-weight: var(--font-weight-semibold);
  margin: 0 0 var(--spacing-sm) 0;
}

p {
  font-size: 16px;
  line-height: 24px;
  margin: 0 0 var(--spacing-md) 0;
}

small {
  font-size: 14px;
  line-height: 20px;
}

.text-tiny {
  font-size: 12px;
  line-height: 16px;
}

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

/* ============================================================================
   Layout & Structure
   ============================================================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-3xl) 0;
}

.section-dark {
  background-color: var(--bg-primary);
}

.section-secondary {
  background-color: var(--bg-secondary);
}

/* ============================================================================
   Hero Section
   ============================================================================ */

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--spacing-3xl) 0;
  min-height: 60vh;
  background: linear-gradient(
    135deg,
    var(--bg-primary) 0%,
    rgba(30, 41, 59, 0.5) 100%
  );
}

.hero h1 {
  font-size: 56px;
  line-height: 64px;
  max-width: 800px;
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(
    to right,
    var(--text-primary),
    var(--accent-secondary)
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: 20px;
  line-height: 28px;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: var(--spacing-2xl);
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

/* ============================================================================
   Buttons & CTAs
   ============================================================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 16px;
}

.btn-primary {
  background-color: var(--accent-primary);
  color: var(--bg-primary);
}

.btn-primary:hover {
  background-color: #5558e3;
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: rgba(99, 102, 241, 0.1);
}

/* ============================================================================
   Cards & Content Blocks
   ============================================================================ */

.card {
  background-color: var(--bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  border: 1px solid rgba(148, 163, 184, 0.1);
  transition: all 0.3s ease;
}

.card:hover {
  border-color: rgba(99, 102, 241, 0.3);
  box-shadow: var(--shadow-md);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

/* ============================================================================
   Product Grid
   ============================================================================ */

.product-card {
  display: flex;
  flex-direction: column;
}

.product-card-icon {
  width: 48px;
  height: 48px;
  background-color: rgba(99, 102, 241, 0.15);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-md);
  font-size: 24px;
}

.product-card-name {
  font-size: 18px;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.product-card-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 20px;
}

/* ============================================================================
   Principles Grid
   ============================================================================ */

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.principle-item {
  padding: var(--spacing-lg);
  border-left: 2px solid var(--accent-primary);
}

.principle-label {
  font-weight: var(--font-weight-semibold);
  color: var(--accent-primary);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: var(--spacing-xs);
}

.principle-description {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 20px;
}

/* ============================================================================
   Navigation
   ============================================================================ */

nav {
  background-color: var(--bg-secondary);
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid rgba(148, 163, 184, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.nav-brand {
  font-weight: var(--font-weight-semibold);
  font-size: 18px;
  color: var(--text-primary);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}

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

/* ============================================================================
   Footer
   ============================================================================ */

footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  padding: var(--spacing-2xl) 0;
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  font-weight: var(--font-weight-semibold);
}

.footer-link {
  display: block;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
  margin-bottom: var(--spacing-sm);
  transition: color 0.2s ease;
}

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

.footer-bottom {
  border-top: 1px solid rgba(148, 163, 184, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: var(--text-secondary);
  font-size: 12px;
}

/* ============================================================================
   Responsive
   ============================================================================ */

@media (max-width: 768px) {
  h1 {
    font-size: 32px;
    line-height: 40px;
  }

  h2 {
    font-size: 24px;
    line-height: 32px;
  }

  .hero h1 {
    font-size: 36px;
    line-height: 44px;
  }

  .hero-subtitle {
    font-size: 16px;
    line-height: 24px;
  }

  .hero-cta {
    flex-direction: column;
  }

  .btn {
    width: 100%;
    text-align: center;
  }

  .nav-links {
    gap: var(--spacing-md);
    font-size: 14px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .section {
    padding: var(--spacing-2xl) 0;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 24px;
    line-height: 32px;
  }

  .hero h1 {
    font-size: 28px;
    line-height: 36px;
  }

  .container {
    padding: 0 var(--spacing-md);
  }

  .nav-links {
    display: none;
  }
}