:root {
  --bg: #fafafa;
  --text: #111;
  --muted: #555;
  --rule: #e5e5e5;
  --accent: #0066cc;
  --code-bg: #f0f0f0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e0e0e;
    --text: #f0f0f0;
    --muted: #a0a0a0;
    --rule: #2a2a2a;
    --accent: #6aaaff;
    --code-bg: #1c1c1c;
  }
}

* { box-sizing: border-box; }

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

body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 640px;
  margin: 0 auto;
  padding: 3rem 1.25rem 5rem;
}

header.hero {
  text-align: center;
  padding: 2rem 0 1rem;
}

header.hero .emoji {
  font-size: 3.5rem;
  line-height: 1;
  margin-bottom: 0.5rem;
}

header.hero .app-icon {
  width: 88px;
  height: 88px;
  border-radius: 20px;
  margin-bottom: 0.75rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
}

h1 {
  font-size: 2rem;
  margin: 0.5rem 0;
  font-weight: 700;
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.25rem;
  margin: 2.5rem 0 0.5rem;
  font-weight: 600;
  letter-spacing: -0.005em;
}

.tagline {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 1.5rem;
}

p { margin: 0.75rem 0; }

ul {
  padding-left: 1.25rem;
  margin: 0.75rem 0;
}

li { margin: 0.35rem 0; }

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

a:hover { border-bottom-color: var(--accent); }

code {
  background: var(--code-bg);
  padding: 0.1em 0.4em;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

blockquote {
  border-left: 3px solid var(--rule);
  margin: 1rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  color: var(--muted);
  font-style: italic;
}

.badge {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  border: 1.5px solid var(--text);
  border-radius: 999px;
  font-weight: 500;
  font-size: 0.95rem;
  margin: 0.5rem 0;
}

.cta { text-align: center; margin: 2rem 0; }

footer {
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}

footer a { color: var(--muted); }
footer a:hover { color: var(--text); border-bottom-color: var(--text); }

.back {
  display: inline-block;
  margin: 2rem 0 0;
  font-size: 0.95rem;
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  main { padding: 2rem 1rem 3rem; }
  header.hero .emoji { font-size: 3rem; }
  header.hero .app-icon { width: 72px; height: 72px; }
  h1 { font-size: 1.6rem; }
}