/* PenMark site — dependency-free, system fonts, light/dark aware. */
:root {
  --bg: #faf9f6;
  --card: #ffffff;
  --ink: #1c1c1e;
  --muted: #6e6e73;
  --accent: #0a84ff;
  --marker: rgba(255, 214, 10, 0.55);
  --border: #e5e5e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161618;
    --card: #1f1f22;
    --ink: #f2f2f4;
    --muted: #98989e;
    --accent: #409cff;
    --marker: rgba(255, 214, 10, 0.35);
    --border: #2c2c30;
  }
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 0 24px; }

header.site { padding: 28px 0; }
header.site .wrap { display: flex; align-items: baseline; justify-content: space-between; }
.wordmark { font-weight: 700; font-size: 1.25rem; text-decoration: none; color: var(--ink); }
.wordmark .mark { background: linear-gradient(transparent 55%, var(--marker) 55%); padding: 0 2px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 20px; font-size: 0.95rem; }
nav a:hover { color: var(--ink); }

.hero { text-align: center; padding: 72px 0 56px; }
.hero h1 { font-size: clamp(2.2rem, 6vw, 3.4rem); line-height: 1.15; letter-spacing: -0.02em; }
.hero h1 .mark { background: linear-gradient(transparent 58%, var(--marker) 58%); padding: 0 4px; }
.hero p.lede { margin: 20px auto 0; max-width: 34em; font-size: 1.15rem; color: var(--muted); }
.cta { margin-top: 36px; }
.cta a.button {
  display: inline-block; background: var(--accent); color: #fff; text-decoration: none;
  padding: 12px 28px; border-radius: 12px; font-weight: 600;
}
.cta p { margin-top: 10px; font-size: 0.85rem; color: var(--muted); }

.features { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); padding: 24px 0 64px; }
.feature {
  background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 24px;
}
.feature .emoji { font-size: 1.8rem; }
.feature h3 { margin: 10px 0 6px; font-size: 1.05rem; }
.feature p { font-size: 0.92rem; color: var(--muted); }

main.doc { padding: 48px 0 64px; }
main.doc h1 { font-size: 2rem; letter-spacing: -0.01em; margin-bottom: 4px; }
main.doc p.updated { color: var(--muted); font-size: 0.9rem; margin-bottom: 32px; }
main.doc h2 { font-size: 1.25rem; margin: 32px 0 8px; }
main.doc p, main.doc li { color: var(--ink); font-size: 1rem; margin-bottom: 10px; }
main.doc ul { padding-left: 22px; margin-bottom: 12px; }
main.doc a { color: var(--accent); }

footer.site { border-top: 1px solid var(--border); padding: 28px 0 48px; }
footer.site .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; color: var(--muted); font-size: 0.88rem; }
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--ink); }