/* eCalc Guides — shared stylesheet */
:root {
  --text: #1a1a1a;
  --muted: #555;
  --bg: #fafafa;
  --card: #fff;
  --border: #ddd;
  --accent: #0b5fff;
  --accent-hover: #0847c7;
  --cta-bg: #f0f5ff;
  --max: 48rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
*, *::before, *::after { box-sizing: border-box; }
html { font-size: 100%; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}
a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover, a:focus-visible { color: var(--accent-hover); }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav {
  max-width: calc(var(--max) + 2rem);
  margin: 0 auto;
  padding: 0.75rem 1rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
}
.nav .brand {
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  margin-right: auto;
}
.nav .brand:hover { color: var(--accent); }
.nav .lang { margin-left: auto; font-size: 0.9rem; }
.nav .lang a { text-decoration: none; padding: 0.15rem 0.35rem; border-radius: 3px; }
.nav .lang a.active {
  background: var(--cta-bg);
  font-weight: 600;
  color: var(--text);
}

main {
  max-width: calc(var(--max) + 2rem);
  margin: 0 auto;
  padding: 1rem 1rem 3rem;
}
.breadcrumb {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0.5rem 0 1.25rem;
}
.breadcrumb .sep { margin: 0 0.25rem; color: #999; }

article, .hub {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem 1.25rem 2rem;
}
@media (min-width: 640px) {
  article, .hub { padding: 2rem 2rem 2.5rem; }
}

h1 {
  font-size: 1.65rem;
  line-height: 1.25;
  margin: 0 0 1rem;
  font-weight: 700;
}
h2 {
  font-size: 1.25rem;
  margin: 2rem 0 0.75rem;
  line-height: 1.3;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.35rem;
}
h3 {
  font-size: 1.05rem;
  margin: 1.5rem 0 0.5rem;
}
p, li { max-width: 70ch; }
p { margin: 0.75rem 0; }
.lead { font-size: 1.05rem; color: var(--muted); }

ul, ol { padding-left: 1.35rem; margin: 0.75rem 0; }
li { margin: 0.35rem 0; }
li > ul, li > ol { margin: 0.25rem 0; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
  overflow-x: auto;
  display: block;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}
th { background: #f3f3f3; font-weight: 600; }
tr:nth-child(even) td { background: #fcfcfc; }

blockquote {
  margin: 1rem 0;
  padding: 0.65rem 1rem;
  border-left: 3px solid var(--accent);
  background: var(--cta-bg);
  color: var(--text);
}
blockquote p { margin: 0.35rem 0; }

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: #f3f3f3;
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: #f3f3f3;
  padding: 0.85rem 1rem;
  overflow-x: auto;
  border-radius: 4px;
  border: 1px solid var(--border);
}
pre code { background: none; padding: 0; }

/* CTA paragraphs often last sections with tool links */
article > p:last-of-type a[href*="ecalc.ch"],
article p a[href*="xcoptercalc"],
article p a[href*="motorcalc"],
article p a[href*="perfcalc"],
article p a[href*="cgcalc"] {
  font-weight: 600;
}

.cta {
  margin: 2rem 0 0;
  padding: 1rem 1.15rem;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  background: var(--cta-bg);
  border-radius: 4px;
}
.cta h2 {
  margin-top: 0;
  border: none;
  font-size: 1.15rem;
  padding-bottom: 0;
}
.cta p:last-child { margin-bottom: 0; }

.related {
  margin-top: 2.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.related h2 {
  font-size: 1.1rem;
  border: none;
  margin-top: 0;
}
.related ul { padding-left: 1.2rem; }

.guide-list { padding-left: 1.4rem; }
.guide-list li { margin: 0.85rem 0; }
.guide-list .meta { color: var(--muted); font-size: 0.9rem; }

.site-footer {
  max-width: calc(var(--max) + 2rem);
  margin: 0 auto;
  padding: 1rem 1rem 2.5rem;
  font-size: 0.875rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
}
.site-footer a { color: var(--muted); }
.site-footer a:hover { color: var(--accent); }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

em { font-style: italic; }
strong { font-weight: 650; }

@media (max-width: 480px) {
  h1 { font-size: 1.4rem; }
  .nav { gap: 0.5rem 0.85rem; }
}