/* CSS Custom Properties */
:root {
  --color-primary: #4F46E5;
  --color-primary-dark: #4338CA;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;
  --font-sans: 'Inter', sans-serif;
}

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

/* Body & Typography */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  color: #111;
  background-color: white;
  line-height: 1.5;
}

html {
  scroll-behavior: smooth;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
}

p {
  margin: 0;
}

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

button {
  font-family: inherit;
}

/* Navigation */
.nav {
  position: sticky;
  top: 0;
  background: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
  z-index: 100;
}

.nav-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

.nav .logo {
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--color-primary);
}

/* Buttons */
.btn-primary {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  font-size: 1rem;
  transition: background-color 0.2s ease;
}

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

.btn-primary.btn-lg {
  padding: 1rem 2rem;
  font-size: 1.1rem;
}

.btn-white {
  background-color: white;
  color: var(--color-primary);
  padding: 1rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  font-size: 1.1rem;
  transition: background-color 0.2s ease;
}

.btn-white:hover {
  background-color: #EEF2FF;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 6rem 2rem 4rem;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: #111;
}

.hero p {
  font-size: 1.25rem;
  color: #555;
  margin-bottom: 2rem;
  line-height: 1.6;
}

.hero .hint {
  font-size: 0.875rem;
  color: #888;
  margin-top: 0.75rem;
  display: block;
}

/* Proof Section */
.proof {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 2rem;
  padding: 4rem 2rem;
  max-width: 1100px;
  margin: 0 auto;
}

.proof-item {
  background: #F9FAFB;
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid #E5E7EB;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.proof-item:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  transform: translateY(-2px);
}

.proof-item h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: #111;
}

.proof-item p {
  font-size: 0.95rem;
  color: #555;
  line-height: 1.6;
}

.proof-item .label {
  display: inline-block;
  background: #EEF2FF;
  color: var(--color-primary);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.6rem;
  border-radius: 4px;
  margin-bottom: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Features Section */
.features {
  padding: 4rem 2rem;
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.features h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: #111;
}

.features p {
  font-size: 1.1rem;
  color: #555;
  margin-bottom: 3rem;
  line-height: 1.6;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  text-align: left;
}

.feature-card {
  padding: 1.5rem;
}

.feature-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: #111;
}

.feature-card p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.6;
}

/* CTA Section */
.cta-section {
  background: #4F46E5;
  color: white;
  text-align: center;
  padding: 5rem 2rem;
}

.cta-section h2 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.cta-section p {
  font-size: 1.1rem;
  opacity: 0.85;
  margin-bottom: 2rem;
  line-height: 1.6;
}

/* Footer */
.footer {
  background: #111;
  color: #999;
  text-align: center;
  padding: 2rem;
  font-size: 0.875rem;
}

.footer a {
  color: #ccc;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer a:hover {
  color: white;
}

.footer a + a::before {
  content: " · ";
  margin: 0 0.5rem;
}

/* Policy Pages */
.policy {
  max-width: 800px;
  margin: 0 auto;
  padding: 4rem 2rem;
}

.policy h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: #111;
}

.policy .subtitle {
  color: #888;
  font-size: 0.9rem;
  margin-bottom: 3rem;
}

.policy h2 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 2rem 0 0.75rem;
  color: #111;
}

.policy h3 {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.5rem 0 0.5rem;
  color: #222;
}

.policy p, .policy ul {
  color: #444;
  line-height: 1.75;
  font-size: 0.95rem;
}

.policy p {
  margin-bottom: 1rem;
}

.policy ul {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}

.policy li {
  margin-bottom: 0.5rem;
}

/* Responsive */
@media (max-width: 640px) {
  .nav-inner {
    padding: 0.75rem 1rem;
  }

  .nav .logo {
    font-size: 1.25rem;
  }

  .hero {
    padding: 4rem 1.5rem;
  }

  .hero h1 {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
  }

  .hero p {
    font-size: 1rem;
  }

  .hero .btn-primary.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
  }

  .proof {
    padding: 3rem 1.5rem;
    gap: 1.5rem;
  }

  .features {
    padding: 3rem 1.5rem;
  }

  .features h2 {
    font-size: 1.5rem;
  }

  .features p {
    font-size: 1rem;
  }

  .cta-section {
    padding: 3rem 1.5rem;
  }

  .cta-section h2 {
    font-size: 1.5rem;
  }

  .cta-section p {
    font-size: 1rem;
  }

  .policy {
    padding: 3rem 1.5rem;
  }

  .policy h1 {
    font-size: 1.5rem;
  }

  .policy h2 {
    font-size: 1.1rem;
  }
}