:root {
  --primary-color: #2563eb;
  --text-color: #1f2937;
  --text-secondary: #6b7280;
  --bg-color: #ffffff;
  --bg-secondary: #f9fafb;
  --border-color: #e5e7eb;
  --max-width: 800px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.7;
  color: var(--text-color);
  background-color: var(--bg-color);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Header */
header {
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  margin-bottom: 2rem;
}

header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0;
  padding-bottom: 0;
}

.logo {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
}

.logo:hover {
  opacity: 0.8;
}

/* Navigation */
nav a {
  color: var(--text-secondary);
  text-decoration: none;
  margin-left: 1.5rem;
  font-size: 0.95rem;
}

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

/* Main content */
main {
  min-height: calc(100vh - 200px);
}

h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
  color: var(--text-color);
}

h3 {
  font-size: 1.25rem;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

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

.subtitle {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.last-updated {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

ul, ol {
  margin-bottom: 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

a {
  color: var(--primary-color);
}

/* App Cards */
.apps-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 2rem;
}

.app-card {
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 1.5rem;
  background: var(--bg-secondary);
  transition: box-shadow 0.2s ease;
}

.app-card:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.app-card h2 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
}

.app-card p {
  margin-bottom: 1rem;
  font-size: 0.95rem;
}

.app-links {
  display: flex;
  gap: 1rem;
}

.app-links a {
  font-size: 0.9rem;
  text-decoration: none;
  color: var(--primary-color);
}

.app-links a:hover {
  text-decoration: underline;
}

/* Footer */
footer {
  border-top: 1px solid var(--border-color);
  padding: 2rem 0;
  margin-top: 3rem;
  text-align: center;
}

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

/* Responsive */
@media (max-width: 600px) {
  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  header .container {
    flex-direction: column;
    gap: 1rem;
  }

  nav a {
    margin-left: 0;
    margin-right: 1.5rem;
  }
}