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

/* Base */
:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
  --color-primary: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-muted: #6b7280;
  --color-border: #e5e7eb;
  --max-width: 48rem;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-title {
  font-size: 1.25rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--color-text);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav a {
  color: var(--color-muted);
  text-decoration: none;
  font-size: 0.95rem;
}

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

/* Main */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0;
}

.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.tagline {
  font-size: 1.2rem;
  color: var(--color-muted);
}

/* Content */
.content {
  font-size: 1.1rem;
  text-align: center;
  max-width: 36rem;
  margin: 0 auto;
}

article {
  padding: 1rem 0;
}

h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.5rem;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
}

p {
  margin-bottom: 1rem;
}

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

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

/* Footer */
footer {
  border-top: 1px solid var(--color-border);
  padding: 2rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: 4rem;
}