/* Drilling guides on drillpro.app. Same plain look as the pricing and legal
   pages, shared here because every guide uses it. */
:root {
  --bg: #ffffff;
  --fg: #1c1f24;
  --muted: #5b6270;
  --accent: #0b6bcb;
  --brand: #123d66;
  --orange: #f06422;
  --rule: #dfe3ea;
  --card: #f5f7fa;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121418;
    --fg: #e6e8ec;
    --muted: #a0a7b4;
    --accent: #6cb4ff;
    --brand: #9cc8f2;
    --rule: #2c313a;
    --card: #1b1f25;
  }
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
nav.top { display: flex; flex-wrap: wrap; justify-content: center; gap: 4px 18px; padding: 12px 16px; background: #082744; font-size: .95rem; }
nav.top a { color: #fff; text-decoration: none; opacity: .9; }
nav.top a:hover { text-decoration: underline; opacity: 1; }
main { max-width: 820px; margin: 0 auto; padding: 28px 16px 64px; }
h1 { font-size: 1.85rem; line-height: 1.25; margin: 0 0 8px; color: var(--brand); }
h2 { font-size: 1.25rem; margin: 32px 0 8px; color: var(--brand); }
h3 { font-size: 1.05rem; margin: 20px 0 6px; }
a { color: var(--accent); }
.meta { color: var(--muted); margin-top: 0; }
.crumbs { font-size: .9rem; color: var(--muted); margin: 0 0 12px; }
.formula { background: var(--card); border: 1px solid var(--rule); border-left: 4px solid var(--orange); border-radius: 8px; padding: 12px 16px; margin: 12px 0; font-family: ui-monospace, "Cascadia Mono", Consolas, monospace; font-size: .95rem; overflow-x: auto; white-space: pre; }
.example { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 14px 18px; margin: 16px 0; }
.example h3 { margin-top: 0; }
.note { border-left: 4px solid var(--accent); padding: 8px 14px; margin: 16px 0; background: var(--card); border-radius: 0 8px 8px 0; }
table { width: 100%; border-collapse: collapse; font-size: .95rem; margin: 12px 0; }
th, td { text-align: left; vertical-align: top; padding: 8px; border-bottom: 1px solid var(--rule); }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 20px 0; }
.card { background: var(--card); border: 1px solid var(--rule); border-radius: 12px; padding: 16px 18px; }
.card h2 { font-size: 1.05rem; margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); }
.cta { display: inline-block; background: var(--orange); color: #fff; text-decoration: none; padding: 10px 18px; border-radius: 8px; font-weight: 600; margin-top: 8px; }
.related { margin-top: 36px; }
footer { border-top: 1px solid var(--rule); margin-top: 48px; padding-top: 16px; color: var(--muted); font-size: .9rem; }
@media (max-width: 560px) {
  h1 { font-size: 1.5rem; }
  .formula { font-size: .85rem; white-space: pre-wrap; }
  /* Wide data tables scroll inside themselves instead of the page. */
  table { display: block; overflow-x: auto; font-size: .88rem; }
  th, td { padding: 6px; }
}