:root {
  --bg: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
}

* {
  box-sizing: border-box;
}

html, body {
  padding: 0;
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Fira Sans", "Droid Sans", "Helvetica Neue",
    "Noto Sans", Arial, sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.container {
  max-width: 880px;
  padding: 0 24px;
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--border);
  padding: 32px 0 24px;
  background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

h1 {
  font-size: 28px;
  margin: 0 0 8px;
  letter-spacing: -0.02em;
}

.last-updated {
  color: var(--muted);
  margin: 0;
}

main section {
  padding: 24px 0;
  border-bottom: 1px solid var(--border);
}

h2 {
  font-size: 22px;
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 18px;
  margin: 20px 0 8px;
}

h4 {
  font-size: 16px;
  margin: 16px 0 8px;
  color: var(--text);
}

p { margin: 12px 0; }

ul {
  padding-left: 20px;
  margin: 8px 0 12px;
}

li { margin: 6px 0; }

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

a:hover { text-decoration: underline; }

.generator-note {
  color: var(--muted);
  font-size: 14px;
}

.site-footer {
  display: flex;
  justify-content: flex-end;
  padding: 24px 0;
}

.back-to-top {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 8px 14px;
  color: var(--accent);
  background: #f9fafb;
}

.back-to-top:hover {
  background: #eef2ff;
}

@media (max-width: 640px) {
  h1 { font-size: 24px; }
  h2 { font-size: 20px; }
  h3 { font-size: 16px; }
}