/* Sumerian website. Mobile first; light and dark follow the device. No external fonts, scripts or trackers. */
:root {
  --bg: #ffffff;
  --text: #16151d;
  --muted: #5d5b6b;
  --card: #f4f3f8;
  --line: #e3e1ec;
  --accent: #5b4bdb;
  --accent-text: #ffffff;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d0c13;
    --text: #f2f1f7;
    --muted: #a7a4b8;
    --card: #1a1924;
    --line: #2a2836;
    --accent: #8f82ff;
    --accent-text: #0d0c13;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 720px; margin: 0 auto; padding: 0 20px; }

header.site { border-bottom: 1px solid var(--line); }
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; font-weight: 700; font-size: 19px; }
.brand svg { width: 28px; height: 28px; }
nav a { color: var(--muted); text-decoration: none; margin-left: 16px; font-size: 15px; }
nav a:hover { color: var(--text); }

.hero { padding: 48px 0 24px; }
.hero h1 { font-size: 36px; line-height: 1.15; margin: 0 0 14px; letter-spacing: -0.02em; }
.hero p { font-size: 19px; color: var(--muted); margin: 0 0 24px; }
.badge {
  display: inline-block; padding: 12px 20px; border-radius: 999px;
  background: var(--accent); color: var(--accent-text); font-weight: 600; text-decoration: none;
}
.note { font-size: 14px; color: var(--muted); margin-top: 12px; }

.features { display: grid; gap: 14px; padding: 24px 0 8px; }
.feature { background: var(--card); border-radius: 18px; padding: 18px 20px; }
.feature h3 { margin: 0 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--muted); }

section.plain { padding: 24px 0; }
section.plain h2 { font-size: 24px; margin: 0 0 10px; }
section.plain p { color: var(--muted); }

article.doc { padding: 32px 0 48px; }
article.doc h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; }
article.doc .meta { color: var(--muted); margin: 0 0 28px; font-size: 15px; }
article.doc h2 { font-size: 21px; margin: 32px 0 8px; }
article.doc ul { padding-left: 22px; }
article.doc li { margin: 6px 0; }
.summary { background: var(--card); border-radius: 18px; padding: 16px 20px; }
.summary p { margin: 8px 0; }

footer.site { border-top: 1px solid var(--line); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer.site a { color: var(--muted); margin-right: 16px; }

@media (min-width: 640px) {
  .hero { padding: 72px 0 32px; }
  .hero h1 { font-size: 48px; }
  .features { grid-template-columns: 1fr 1fr; }
}