/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* CSS Variables for Light / Dark themes */
:root {
  --bg-color: #ffffff;
  --text-primary: #111827;
  --text-secondary: #4b5563;
  --primary-color: #0f172a;
  --accent-color: #3b82f6;
  --accent-hover: #2563eb;
  --border-color: #e5e7eb;
  --card-bg: #f9fafb;
  --card-border: #f3f4f6;
  --font-family: 'Inter', sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #000000;
    --text-primary: #f9fafb;
    --text-secondary: #9ca3af;
    --primary-color: #ffffff;
    --accent-color: #3b82f6;
    --accent-hover: #60a5fa;
    --border-color: #374151;
    --card-bg: #111827;
    --card-border: #1f2937;
  }
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

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

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 3rem;
}

.section-header h2 {
  font-size: 2.5rem;
  letter-spacing: -0.03em;
}

/* Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--border-color);
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
}

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

/* Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 9999px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-size: 1rem;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

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

.btn-secondary:hover {
  background-color: var(--card-bg);
}

@media (prefers-color-scheme: dark) {
  .btn-primary {
    color: #000;
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.1);
  }
}

/* Hero Section */
.hero {
  padding: 8rem 0 6rem;
  text-align: center;
}

.hero h1 {
  font-size: 4.5rem;
  letter-spacing: -0.04em;
  margin-bottom: 1.5rem;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-bottom: 4rem;
}

/* Placeholders */
.hero-image-placeholder {
  max-width: 800px;
  margin: 0 auto;
}

.placeholder-mockup {
  background-color: var(--card-bg);
  border: 1px dashed var(--text-secondary);
  border-radius: 1rem;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  font-weight: 500;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* Features Grid */
.features {
  padding: 5rem 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 2rem;
}

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

.feature-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

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

/* Benefits */
.benefits {
  padding: 5rem 0;
  background-color: var(--card-bg);
  border-radius: 2rem;
  margin: 2rem 0;
  padding: 5rem 3rem;
}

.benefits-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.benefits ul {
  list-style: none;
}

.benefits li {
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
}

.benefits li::before {
  content: '✓';
  color: var(--accent-color);
  font-weight: bold;
  margin-right: 1rem;
}

.benefit-mockup {
  height: 300px;
}

/* FAQ Section */
.faq {
  padding: 5rem 0;
}

.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--border-color);
}

.faq-item h4 {
  font-size: 1.25rem;
}

/* Contact */
.contact {
  text-align: center;
  padding: 5rem 0;
}

/* Content Pages (Privacy, Terms) */
.page-header {
  padding: 5rem 0 2rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 3rem;
}

.page-header h1 {
  font-size: 3rem;
  letter-spacing: -0.03em;
}

.content-section {
  max-width: 800px;
  margin: 0 auto 5rem;
}

.content-section h2 {
  font-size: 1.75rem;
  margin-top: 3rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.content-section h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

.content-section ul {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-secondary);
}

.content-section li {
  margin-bottom: 0.5rem;
}

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

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.copyright {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .nav-links {
    display: none;
  }

  .benefits-content {
    grid-template-columns: 1fr;
  }
}