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

:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --border: #334155;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s;
}

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

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  font-weight: 700;
  margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }

p { margin-bottom: 1rem; }

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* Header */
header {
  background-color: var(--bg-primary);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.05em;
}

.logo span { color: var(--accent); }

nav ul {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.cta-button {
  background-color: var(--accent);
  color: white;
  padding: 0.75rem 1.5rem;
  border-radius: 0.5rem;
  font-weight: 600;
  display: inline-block;
}

.cta-button:hover {
  background-color: var(--accent-hover);
  color: white;
}

/* Hero Section */
.hero {
  padding: 6rem 0;
  text-align: center;
  background: radial-gradient(circle at top center, #1e293b 0%, #0f172a 70%);
}

.hero h1 {
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  max-width: 800px;
  margin: 0 auto 2rem;
}

/* Features Grid */
.features {
  padding: 4rem 0;
}

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

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 2rem;
  transition: transform 0.2s, border-color 0.2s;
}

.card:hover {
  transform: translateY(-5px);
  border-color: var(--accent);
}

.card h3 {
  color: var(--text-primary);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0;
}

.icon {
  font-size: 1.5rem;
}

/* Value Props Section */
.value-prop {
  padding: 4rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background-color: #0f172a;
}

.diagram {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: 1rem;
  font-family: monospace;
  white-space: pre;
  overflow-x: auto;
  margin: 2rem auto;
  max-width: 800px;
  border: 1px solid var(--border);
  color: var(--accent);
  text-align: center;
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  padding: 4rem 0 2rem;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-col h4 {
  margin-bottom: 1.5rem;
  color: var(--text-primary);
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 0.75rem;
}

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

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

.copyright {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

/* Utility */
.text-center { text-align: center; }
.mb-2 { margin-bottom: 2rem; }
.section-title {
  text-align: center;
  margin-bottom: 3rem;
}
.section-title h2 { margin-bottom: 1rem; }
.section-title p { color: var(--text-secondary); }

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2.5rem; }
  .nav-wrapper { flex-direction: column; gap: 1rem; }
  nav ul { gap: 1rem; font-size: 0.9rem; }
}