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

:root {
  --primary: #111827;
  --primary-light: #1f2937;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --text: #0f1216;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f9fafb;
  --bg-dark: #f3f4f6;
  --border: #e5e7eb;
  --success: #10b981;
  --radius: 12px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, 
    Cantarell, 'Helvetica Neue', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Navigation */
.nav {
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  background: rgba(255, 255, 255, 0.9);
}

.nav-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  text-decoration: none;
}

.logo img {
  border-radius: 8px;
}

.nav-links {
  display: flex;
  gap: 32px;
}

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

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

/* Hero */
.hero {
  padding: 80px 0 120px;
  background: linear-gradient(to bottom, var(--bg-alt), var(--bg));
}

.hero-content {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 20px;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 1.5rem;
  color: var(--text-light);
  margin-bottom: 16px;
  font-weight: 500;
}

.description {
  font-size: 1.125rem;
  color: var(--text-light);
  margin-bottom: 40px;
  line-height: 1.8;
}

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

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  transition: all 0.2s;
  cursor: pointer;
  border: none;
}

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

.btn-primary:hover {
  background: var(--primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
  background: var(--border);
}

/* Features */
.features {
  padding: 80px 0;
  background: var(--bg);
}

.features h2 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 60px;
  color: var(--primary);
  font-weight: 700;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 32px;
}

.feature-card {
  background: var(--bg-alt);
  padding: 32px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.3s;
}

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

.feature-icon {
  font-size: 3rem;
  margin-bottom: 16px;
}

.feature-card h3 {
  font-size: 1.375rem;
  margin-bottom: 12px;
  color: var(--primary);
  font-weight: 600;
}

.feature-card p {
  color: var(--text-light);
  line-height: 1.7;
}

/* Install */
.install {
  padding: 80px 0;
  background: var(--bg-alt);
}

.install h2 {
  font-size: 2.5rem;
  text-align: center;
  margin-bottom: 60px;
  color: var(--primary);
  font-weight: 700;
}

.install-steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-bottom: 60px;
}

.step {
  display: flex;
  gap: 20px;
}

.step-number {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.25rem;
}

.step-content h3 {
  font-size: 1.25rem;
  margin-bottom: 8px;
  color: var(--primary);
}

.step-content p {
  color: var(--text-light);
  line-height: 1.6;
}

.cta-center {
  text-align: center;
}

/* Privacy Notice */
.privacy-notice {
  padding: 80px 0;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  text-align: center;
}

.privacy-notice h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  font-weight: 700;
}

.privacy-notice p {
  font-size: 1.125rem;
  margin-bottom: 24px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0.95;
}

.privacy-link {
  color: white;
  font-weight: 600;
  text-decoration: none;
  border-bottom: 2px solid white;
  padding-bottom: 4px;
  transition: opacity 0.2s;
}

.privacy-link:hover {
  opacity: 0.8;
}

/* Privacy Page */
.privacy-page {
  padding: 60px 0 80px;
  max-width: 860px;
  margin: 0 auto;
}

.privacy-page h1 {
  font-size: 3rem;
  margin-bottom: 12px;
  color: var(--primary);
  font-weight: 700;
}

.last-updated {
  color: var(--text-light);
  font-size: 0.95rem;
  margin-bottom: 40px;
}

.privacy-section {
  margin-bottom: 48px;
}

.privacy-section h2 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: var(--primary);
  font-weight: 600;
}

.privacy-section h3 {
  font-size: 1.375rem;
  margin: 28px 0 16px;
  color: var(--primary);
  font-weight: 600;
}

.privacy-section p {
  margin-bottom: 16px;
  line-height: 1.8;
  color: var(--text);
}

.privacy-section ul {
  margin: 16px 0 16px 24px;
  line-height: 1.8;
}

.privacy-section li {
  margin-bottom: 10px;
  color: var(--text);
}

.privacy-section a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent);
  transition: opacity 0.2s;
}

.privacy-section a:hover {
  opacity: 0.8;
}

.summary {
  background: var(--bg-alt);
  padding: 32px;
  border-radius: var(--radius);
  border-left: 4px solid var(--success);
}

.summary-box p {
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--primary);
}

.summary-box ul {
  list-style: none;
  margin: 0;
}

.summary-box li {
  padding-left: 8px;
  margin-bottom: 8px;
  color: var(--text);
}

/* Footer */
.footer {
  background: var(--primary);
  color: white;
  padding: 60px 0 32px;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-section h4 {
  font-size: 1.125rem;
  margin-bottom: 16px;
  font-weight: 600;
}

.footer-section p {
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.6;
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: 10px;
}

.footer-section a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-section a:hover {
  color: white;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.5rem;
  }
  
  .tagline {
    font-size: 1.25rem;
  }
  
  .features h2,
  .install h2,
  .privacy-notice h2 {
    font-size: 2rem;
  }
  
  .privacy-page h1 {
    font-size: 2.25rem;
  }
  
  .nav-links {
    gap: 20px;
  }
  
  .features-grid,
  .install-steps {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .cta-buttons {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
}