/* ========================================
   Fundis.AI - Intelligence Engine Landing
   ======================================== */

:root {
  --color-bg-primary: #0b0d10;
  --color-bg-secondary: #10131a;
  --color-bg-tertiary: #161a24;
  --color-bg-card: #1a1f2a;
  --color-bg-hover: #222836;

  --color-border: #252a38;
  --color-border-light: #353d50;

  --color-text-primary: #e4e6eb;
  --color-text-secondary: #8b92a5;
  --color-text-tertiary: #5c6478;

  --color-accent: #6b8acd;
  --color-accent-hover: #8aa3e0;
  --color-success: #5a9a7a;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

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

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

ul {
  list-style: none;
}

code {
  font-family: var(--font-mono);
}

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

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(11, 13, 16, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: baseline;
  gap: var(--spacing-sm);
}

.logo-text {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text-primary);
}

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

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--spacing-sm);
}

.nav-toggle span {
  width: 20px;
  height: 2px;
  background: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  background: var(--color-bg-secondary);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-md) var(--spacing-lg);
  flex-direction: column;
  gap: var(--spacing-md);
  z-index: 999;
}

.mobile-nav a {
  font-size: 14px;
  color: var(--color-text-secondary);
  padding: var(--spacing-sm) 0;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .mobile-nav.active {
    display: flex;
  }
}

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

.hero {
  padding: 140px var(--spacing-lg) var(--spacing-3xl);
  text-align: center;
}

.hero-container {
  max-width: 800px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: 100px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.hero h1 {
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: var(--spacing-lg);
}

.hero-description {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  line-height: 1.7;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  font-size: 15px;
  font-weight: 500;
  transition: all var(--transition-fast);
}

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

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

.btn-secondary {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

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

/* ========================================
   Stats Bar
   ======================================== */

.stats-bar {
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg-secondary);
}

.stats-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-lg);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-2xl);
  flex-wrap: wrap;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
}

.stat-value {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
}

.stat-label {
  font-size: 12px;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-divider {
  width: 1px;
  height: 32px;
  background: var(--color-border);
}

@media (max-width: 600px) {
  .stats-container {
    gap: var(--spacing-lg);
  }

  .stat-divider {
    display: none;
  }

  .stat-item {
    flex: 1 1 40%;
  }
}

/* ========================================
   Shared Section Styles
   ======================================== */

.section-container {
  max-width: 1200px;
  margin: 0 auto;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
  font-size: 32px;
  font-weight: 700;
  margin-bottom: var(--spacing-sm);
}

.section-header p {
  font-size: 16px;
  color: var(--color-text-secondary);
}

/* ========================================
   Capabilities
   ======================================== */

.capabilities {
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.capabilities-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
}

.capability-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
}

.capability-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(107, 138, 205, 0.1);
  border: 1px solid rgba(107, 138, 205, 0.3);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  color: var(--color-accent);
}

.capability-card h4 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.capability-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

@media (max-width: 600px) {
  .capabilities-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================
   Architecture Diagram
   ======================================== */

.architecture {
  padding: var(--spacing-3xl) var(--spacing-lg);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.arch-diagram {
  max-width: 960px;
  margin: 0 auto;
}

.arch-flow {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-lg);
}

.arch-sources,
.arch-outputs {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.arch-node {
  background: var(--color-bg-tertiary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: center;
  min-width: 180px;
}

.arch-node-label {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xs);
}

.arch-node-detail {
  font-size: 12px;
  color: var(--color-text-tertiary);
}

.arch-engine {
  background: var(--color-bg-primary);
  border-color: var(--color-accent);
  padding: var(--spacing-xl);
}

.arch-engine .arch-node-label {
  font-size: 18px;
  color: var(--color-accent);
}

.arch-steps {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.arch-step {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: rgba(107, 138, 205, 0.1);
  border: 1px solid rgba(107, 138, 205, 0.2);
  border-radius: var(--radius-sm);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
}

.arch-arrow {
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

@media (max-width: 900px) {
  .arch-flow {
    flex-direction: column;
  }

  .arch-sources,
  .arch-outputs {
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
  }

  .arch-arrow {
    transform: rotate(90deg);
  }

  .arch-node {
    min-width: 140px;
  }
}

/* ========================================
   Ecosystem
   ======================================== */

.ecosystem {
  padding: var(--spacing-3xl) var(--spacing-lg);
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

.ecosystem-card {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
}

.ecosystem-card:hover {
  border-color: var(--color-border-light);
  background: var(--color-bg-tertiary);
}

.ecosystem-card h4 {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.ecosystem-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
}

.ecosystem-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
}

.ecosystem-current {
  border-color: rgba(107, 138, 205, 0.3);
  background: rgba(107, 138, 205, 0.05);
}

.ecosystem-current:hover {
  background: rgba(107, 138, 205, 0.08);
  border-color: rgba(107, 138, 205, 0.4);
}

.ecosystem-current-label {
  color: var(--color-text-tertiary);
  font-style: italic;
}

@media (max-width: 768px) {
  .ecosystem-grid {
    grid-template-columns: 1fr;
  }
}

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

.footer {
  padding: var(--spacing-xl) var(--spacing-lg) var(--spacing-md);
  background: var(--color-bg-secondary);
  border-top: 1px solid var(--color-border);
}

.footer-container {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-main {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 600;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.footer-brand p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  gap: var(--spacing-2xl);
}

.footer-column h5 {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-column a {
  display: block;
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
  transition: color var(--transition-fast);
}

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

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

.footer-bottom p {
  font-size: 12px;
  color: var(--color-text-tertiary);
  margin-bottom: 0;
}

@media (max-width: 768px) {
  .footer-main {
    flex-direction: column;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: var(--spacing-xl);
  }

  .footer-column {
    min-width: 140px;
  }
}

/* ========================================
   Utility
   ======================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}