:root {
  --ink: #16211f;
  --muted: #55615e;
  --line: #dfe6e3;
  --bg: #fbfaf6;
  --card: #ffffff;
  --teal: #0f4a43;
  --teal-deep: #0d2b2a;
  --saffron: #e39a2d;
  --green: #0f7a3d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

a { color: var(--teal); }
img { max-width: 100%; height: auto; }

.wrap { max-width: 880px; margin: 0 auto; padding-inline: 20px; }

header.site {
  background: linear-gradient(135deg, var(--teal-deep), var(--teal));
  color: #fff;
}
header.site .bar {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding-block: 14px; flex-wrap: wrap;
}
header.site .brand { display: flex; align-items: center; gap: 10px; color: #fff; text-decoration: none; font-weight: 700; }
header.site .brand img { width: 32px; height: 32px; border-radius: 8px; }
header.site nav { display: flex; gap: 18px; }
header.site nav a { color: #cfe3df; text-decoration: none; font-size: 15px; }
header.site nav a:hover, header.site nav a[aria-current] { color: #fff; }

.hero { padding-block: 40px 56px; display: flex; align-items: center; gap: 32px; flex-wrap: wrap; }
.hero img { width: 120px; height: 120px; border-radius: 26px; flex: none; }
.hero h1 { margin: 0; font-size: clamp(32px, 6vw, 46px); line-height: 1.1; }
.hero .tag { margin: 8px 0 0; color: #f3c27a; font-size: 20px; font-weight: 600; }
.hero .sub { margin: 10px 0 0; color: #cfe3df; max-width: 520px; }

main { padding-block: 40px 64px; }
main h1 { font-size: 34px; margin: 0 0 4px; line-height: 1.2; }
main h2 { font-size: 23px; margin: 44px 0 10px; }
main h3 { font-size: 18px; margin: 26px 0 6px; }
.updated { color: var(--muted); margin: 0 0 24px; }

.lead {
  background: var(--card); border: 1px solid var(--line); border-left: 4px solid var(--saffron);
  border-radius: 8px; padding: 14px 18px; margin: 20px 0;
}

.formula {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 15px;
  background: var(--teal-deep); color: #fff; border-radius: 8px; padding: 14px 18px; overflow-x: auto;
}

.table-scroll { overflow-x: auto; margin: 12px 0; }
table { border-collapse: collapse; width: 100%; background: var(--card); font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 10px 12px; border-bottom: 1px solid var(--line); }
th { background: #f1f4f2; font-weight: 600; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 14px; margin: 16px 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

figure { margin: 22px 0; }
figure img { border-radius: 10px; border: 1px solid var(--line); display: block; }
figcaption { color: var(--muted); font-size: 14px; margin-top: 6px; }

.band { display: inline-block; width: 12px; height: 12px; border-radius: 50%; margin-right: 8px; vertical-align: -1px; }

footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
footer.site .wrap { padding-block: 22px; display: flex; gap: 18px; flex-wrap: wrap; justify-content: space-between; }
footer.site nav { display: flex; gap: 16px; flex-wrap: wrap; }