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

:root {
  --primary: #4285f4;
  --primary-dark: #3367d6;
  --secondary: #34a853;
  --danger: #ea4335;
  --warning: #fbbc05;
  --dark: #202124;
  --gray-900: #3c4043;
  --gray-700: #5f6368;
  --gray-500: #80868b;
  --gray-300: #dadce0;
  --gray-100: #f1f3f4;
  --white: #ffffff;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.6;
  color: var(--gray-900);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

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

.btn-google {
  background: var(--white);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
  padding: 14px 32px;
  font-size: 16px;
}

.btn-google:hover {
  background: var(--gray-100);
  box-shadow: var(--shadow-md);
}

.btn-github {
  background: var(--dark);
  color: var(--white);
  padding: 14px 32px;
  font-size: 16px;
}

.btn-github:hover {
  background: #000;
  box-shadow: var(--shadow-md);
}

/* Header */
.header {
  padding: 20px 0;
  border-bottom: 1px solid var(--gray-100);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--primary);
}

.nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav a {
  color: var(--gray-700);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.2s;
}

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

/* Hero */
.hero {
  padding: 100px 0;
  text-align: center;
  background: linear-gradient(180deg, var(--white) 0%, var(--gray-100) 100%);
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 20px;
  color: var(--gray-700);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* Features */
.features {
  padding: 100px 0;
}

.features h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: var(--dark);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
}

.feature-card {
  padding: 32px;
  background: var(--white);
  border-radius: var(--radius-lg);
  border: 1px solid var(--gray-300);
  transition: box-shadow 0.2s, transform 0.2s;
}

.feature-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border-radius: var(--radius-md);
  margin-bottom: 20px;
  color: var(--white);
}

.feature-card h3 {
  font-size: 18px;
  margin-bottom: 12px;
  color: var(--dark);
}

.feature-card p {
  color: var(--gray-700);
  font-size: 14px;
}

/* Security Section */
.security {
  padding: 100px 0;
  background: var(--gray-100);
}

.security h2 {
  text-align: center;
  font-size: 36px;
  margin-bottom: 60px;
  color: var(--dark);
}

.security-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.security-text p {
  margin-bottom: 20px;
  color: var(--gray-700);
}

.security-text ul {
  list-style: none;
  padding-left: 0;
}

.security-text li {
  padding: 8px 0;
  padding-left: 28px;
  position: relative;
  color: var(--gray-700);
}

.security-text li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--secondary);
  font-weight: bold;
}

.security-diagram {
  background: var(--dark);
  color: var(--secondary);
  padding: 32px;
  border-radius: var(--radius-lg);
  font-family: 'Monaco', 'Menlo', monospace;
  font-size: 14px;
  overflow-x: auto;
}

.security-diagram pre {
  margin: 0;
}

/* Footer */
.footer {
  padding: 40px 0;
  text-align: center;
  border-top: 1px solid var(--gray-300);
}

.footer p {
  color: var(--gray-700);
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--gray-500);
  text-decoration: none;
}

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

/* Legal Content (Privacy & Terms) */
.legal-content {
  padding: 60px 0 100px;
  min-height: calc(100vh - 200px);
}

.legal-content h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}

.legal-updated {
  color: var(--gray-500);
  font-size: 14px;
  margin-bottom: 40px;
}

.legal-section {
  margin-bottom: 40px;
  max-width: 800px;
}

.legal-section h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--dark);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--gray-100);
}

.legal-section h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--gray-900);
  margin: 20px 0 12px;
}

.legal-section p {
  color: var(--gray-700);
  margin-bottom: 16px;
  line-height: 1.7;
}

.legal-section ul {
  margin: 16px 0;
  padding-left: 24px;
}

.legal-section li {
  color: var(--gray-700);
  margin-bottom: 8px;
  line-height: 1.6;
}

.legal-section strong {
  color: var(--dark);
}

.legal-warning {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: var(--radius-md);
  padding: 16px;
  color: #856404;
  margin-top: 16px;
}

/* Logo as link */
a.logo {
  text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 32px;
  }

  .hero-subtitle {
    font-size: 16px;
  }

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

  .nav {
    gap: 16px;
  }

  .legal-content h1 {
    font-size: 28px;
  }

  .legal-section h2 {
    font-size: 20px;
  }
}