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

:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #666666;
  --color-primary: #1a1a1a;
  --color-primary-hover: #333333;
  --color-accent: #10a37f;
  --color-border: #e5e5e5;
  --color-bg-alt: #f9f9f9;
  --max-width: 1100px;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a:hover {
  text-decoration: underline;
}

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

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 600;
  font-size: 1.125rem;
}

.logo a {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: inherit;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
}

.nav-links a {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
  text-decoration: none;
}

/* Main content */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

section {
  padding: var(--spacing-xl) 0;
}

h1, h2, h3 {
  line-height: 1.3;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
}

h2 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  text-align: center;
}

h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

/* Hero section */
.hero {
  text-align: center;
  padding: var(--spacing-xl) 0;
}

.hero h1 {
  margin-bottom: var(--spacing-md);
}

.subtitle {
  font-size: 1.25rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.cta-button {
  display: inline-block;
  background: var(--color-primary);
  color: white;
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: 8px;
  font-weight: 600;
  font-size: 1.125rem;
  text-decoration: none;
  transition: background-color 0.2s;
}

.cta-button:hover {
  background: var(--color-primary-hover);
  text-decoration: none;
}

.cta-note {
  margin-top: var(--spacing-md);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Problem section */
.problem {
  background: var(--color-bg-alt);
  margin: 0 calc(-1 * var(--spacing-lg));
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

.comparison {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  max-width: 700px;
  margin: 0 auto;
}

.comparison-item {
  text-align: center;
}

.comparison-item h3 {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-muted);
  font-weight: 500;
}

.example {
  background: white;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-lg);
  text-align: left;
  font-family: 'Georgia', serif;
}

.example p {
  margin: 0;
}

.example.bad .spacer {
  height: 1rem;
}

.example.bad {
  border-color: #ffcdd2;
}

.example.good {
  border-color: #c8e6c9;
}

.caption {
  margin-top: var(--spacing-sm);
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Features section */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.feature {
  text-align: center;
  padding: var(--spacing-lg);
}

.feature-icon {
  width: 64px;
  height: 64px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-alt);
  border-radius: 12px;
  color: var(--color-primary);
}

.feature p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* How it works section */
.how-it-works {
  background: var(--color-bg-alt);
  margin: 0 calc(-1 * var(--spacing-lg));
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

.steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.step {
  text-align: center;
}

.step-number {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  font-size: 1.25rem;
  font-weight: 600;
}

.step p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* Feedback section */
.feedback {
  text-align: center;
}

.feedback p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

.secondary-button {
  display: inline-block;
  background: transparent;
  color: var(--color-primary);
  padding: var(--spacing-md) var(--spacing-lg);
  border: 2px solid var(--color-primary);
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s;
}

.secondary-button:hover {
  background: var(--color-primary);
  color: white;
  text-decoration: none;
}

/* Footer */
footer {
  border-top: 1px solid var(--color-border);
  margin-top: var(--spacing-xl);
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
}

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

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

/* Content pages (Privacy, etc.) */
.content-page {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.privacy-policy {
  max-width: 700px;
  margin: 0 auto;
}

.privacy-policy h1 {
  margin-bottom: var(--spacing-sm);
}

.privacy-policy .last-updated {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-bottom: var(--spacing-xl);
}

.privacy-policy section {
  padding: var(--spacing-lg) 0;
  border-bottom: 1px solid var(--color-border);
}

.privacy-policy section:last-child {
  border-bottom: none;
}

.privacy-policy h2 {
  text-align: left;
  font-size: 1.25rem;
  margin-bottom: var(--spacing-md);
}

.privacy-policy ul {
  margin-left: var(--spacing-lg);
  color: var(--color-text-muted);
}

.privacy-policy li {
  margin-bottom: var(--spacing-sm);
}

.privacy-policy p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.privacy-policy p:last-child {
  margin-bottom: 0;
}

.privacy-policy strong {
  color: var(--color-text);
}

.privacy-policy code {
  background: var(--color-bg-alt);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  font-size: 0.875rem;
}

/* Responsive */
@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  .subtitle {
    font-size: 1.1rem;
  }

  nav {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .nav-links {
    gap: var(--spacing-md);
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .footer-links {
    flex-direction: column;
    gap: var(--spacing-sm);
  }
}