:root {
  --bg-color: #FFFFFF;
  --section-bg: #F6F7F8;
  --text-color: #1C1C1E;
  --accent-color: #4A6CF7;
  --border-color: #E5E5EA; /* Subtle gray for dividers */
  
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  --spacing-base: 24px;
  --spacing-large: 48px;
  
  --max-width: 720px;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-stack);
  background-color: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-base);
}

/* Typography */
h1, h2, h3 {
  font-weight: 600;
  margin-top: 0;
  color: var(--text-color);
}

h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-base);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  margin-top: var(--spacing-large);
}

p {
  font-size: 1.125rem; /* Larger body text for 40+ */
  margin-bottom: 1.5rem;
  color: #3A3A3C; /* Slightly softer than pure black */
}

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

a:hover {
  text-decoration: underline;
}

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

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap; /* Be nice on small screens */
  gap: 1rem;
}

.brand {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-color);
}

nav a {
  margin-left: 1.5rem;
  font-size: 1rem;
  color: #8E8E93; /* Muted links */
}

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

/* Main Content */
main {
  min-height: 60vh;
  margin-bottom: var(--spacing-large);
}

.page-title {
  margin-bottom: var(--spacing-base);
  padding-bottom: var(--spacing-base);
  border-bottom: 1px solid var(--border-color);
}

.content-section {
  background-color: var(--bg-color); /* Kept white for clean look */
}

/* Subtle highlights if needed, but per request keeping it very clean */
.note {
  background-color: var(--section-bg);
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1.5rem 0;
}

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

.footer-content {
  color: #8E8E93;
  font-size: 0.875rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Mobile adjustments */
@media (max-width: 600px) {
  h1 { font-size: 1.75rem; }
  p { font-size: 1rem; }
  
  .header-content {
    flex-direction: column;
    align-items: flex-start;
  }
  
  nav a {
    margin-left: 0;
    margin-right: 1.5rem;
    display: inline-block;
    margin-top: 0.5rem;
  }
}