:root {
  --bg: #f4f7fe;
  --card: #ffffff;
  --text: #0f1f44;
  --muted: #5b6785;
  --primary: #1e63e9;
  --line: #dce3f0;
  --soft: #edf3ff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1322;
    --card: #161f35;
    --text: #e8eeff;
    --muted: #9aa6c4;
    --primary: #6f9bff;
    --line: #2a3654;
    --soft: #1c2741;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 24px 16px 56px; }
header.site { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
header.site a.brand { display: flex; align-items: center; gap: 12px; color: var(--text); text-decoration: none; }
.logo {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  background: linear-gradient(135deg, #4f8bff, #1449b8);
  display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 20px;
}
.brand-name { font-weight: 800; font-size: 20px; }
nav.links { margin-left: auto; display: flex; gap: 14px; flex-wrap: wrap; font-size: 15px; }
a { color: var(--primary); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px 24px;
}
h1 { font-size: 30px; line-height: 1.2; margin: 0 0 6px; }
h2 { font-size: 20px; margin: 30px 0 8px; }
h3 { font-size: 17px; margin: 20px 0 6px; }
.meta { color: var(--muted); font-size: 14px; margin: 0 0 18px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
ul { padding-left: 22px; }
li { margin: 4px 0; }
.summary {
  background: var(--soft);
  border-radius: 14px;
  padding: 14px 18px;
  margin: 18px 0 8px;
}
.summary ul { margin: 6px 0 0; }
table { width: 100%; border-collapse: collapse; margin: 10px 0; font-size: 15px; }
th, td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { color: var(--muted); font-weight: 600; }
.table-scroll { overflow-x: auto; }
footer { margin-top: 28px; color: var(--muted); font-size: 14px; text-align: center; }
.hero { text-align: center; padding: 36px 24px; }
.hero .logo { width: 72px; height: 72px; border-radius: 20px; font-size: 32px; margin: 0 auto 14px; }
.tagline { color: var(--muted); font-size: 18px; margin: 0 0 20px; }
.buttons { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 12px 20px; border-radius: 14px; text-decoration: none; font-weight: 600;
  border: 1px solid var(--line); background: var(--card); color: var(--text);
}
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
@media (max-width: 520px) {
  h1 { font-size: 25px; }
  .card { padding: 22px 16px; }
  nav.links { margin-left: 0; width: 100%; }
  header.site { flex-wrap: wrap; }
}