:root {
  --primary-color: #2E8B57; /* A premium, calming green */
  --primary-light: #3CB371;
  --bg-color: #ffffff;
  --text-color: #1f2937;
  --text-muted: #6b7280;
  --card-bg: #f9fafb;
  --border-color: #e5e7eb;
  --nav-bg: rgba(255, 255, 255, 0.8);
  --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #111827;
    --text-color: #f9fafb;
    --text-muted: #9ca3af;
    --card-bg: #1f2937;
    --border-color: #374151;
    --nav-bg: rgba(17, 24, 39, 0.8);
    --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
  }
}

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

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Navigation */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 5%;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  letter-spacing: -0.05em;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

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

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 8rem 5% 4rem;
  background: radial-gradient(circle at top right, rgba(46, 139, 87, 0.1), transparent 40%),
              radial-gradient(circle at bottom left, rgba(60, 179, 113, 0.05), transparent 40%);
}

.hero h1 {
  font-size: clamp(3rem, 5vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-color) 0%, var(--text-muted) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: fadeInUp 0.8s ease forwards;
  opacity: 0;
  transform: translateY(20px);
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-muted);
  max-width: 600px;
  margin-bottom: 2.5rem;
  animation: fadeInUp 0.8s ease 0.2s forwards;
  opacity: 0;
  transform: translateY(20px);
}

.btn {
  display: inline-block;
  padding: 1rem 2rem;
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 9999px;
  font-weight: 600;
  font-size: 1.125rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
  animation: fadeInUp 0.8s ease 0.4s forwards;
  opacity: 0;
  transform: translateY(20px);
  border: none;
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(46, 139, 87, 0.2);
  background-color: var(--primary-light);
}

/* Sections */
section {
  padding: 6rem 5%;
  max-width: 1200px;
  margin: 0 auto;
}

.section-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 3rem;
  text-align: center;
}

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

.feature-card {
  background: var(--card-bg);
  padding: 2.5rem;
  border-radius: 1.5rem;
  border: 1px solid var(--border-color);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--glass-shadow);
}

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 1.5rem;
}

.feature-card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

.feature-card p {
  color: var(--text-muted);
}

/* Document content (for privacy policy) */
.document-content {
  max-width: 800px;
  margin: 0 auto;
  padding-top: 8rem;
}

.document-content h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.document-content h2 {
  font-size: 1.75rem;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
}

.document-content p, .document-content ul {
  margin-bottom: 1.25rem;
  color: var(--text-muted);
}

.document-content ul {
  padding-left: 1.5rem;
}

.document-content a {
  color: var(--primary-color);
  text-decoration: none;
}

.document-content a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  text-align: center;
  padding: 3rem 5%;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
}

footer p {
  margin-bottom: 1rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
  margin: 0 0.5rem;
  font-size: 0.875rem;
}

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

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

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none; /* simple mobile behavior for now */
  }
}