/* Shared styles for Luna investigation learner pages (/learn/<slug>/).
   Hand-written, no framework, no webfonts (COEP forbids cross-origin loads).
   Dark and light via prefers-color-scheme. No emojis. */

:root {
  --bg: #ffffff;
  --fg: #1a1c22;
  --muted: #55606e;
  --accent: #1a5fb4;
  --accent-fg: #ffffff;
  --border: #d5dae2;
  --tip-bg: #eef4fb;
  --tip-border: #1a5fb4;
  --safety-bg: #fff4e5;
  --safety-border: #b34700;
  --safety-fg: #5c2600;
  --draft-bg: #fde8c8;
  --draft-fg: #5c3b00;
  --code-bg: #f2f4f7;
  --max: 70ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161b;
    --fg: #e6e8ec;
    --muted: #9aa4b2;
    --accent: #6ea8fe;
    --accent-fg: #0b1220;
    --border: #2b313b;
    --tip-bg: #182231;
    --tip-border: #6ea8fe;
    --safety-bg: #2e1c0d;
    --safety-border: #ffa94d;
    --safety-fg: #ffd8a8;
    --draft-bg: #3a2a0a;
    --draft-fg: #ffe8bf;
    --code-bg: #1c2029;
  }
}

/* Explicit theme toggle wins over the media query in both directions. */
:root[data-theme='light'] { color-scheme: light; }
:root[data-theme='dark'] { color-scheme: dark; }

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  font-size: 1.05rem;
  line-height: 1.6;
}

main {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 4rem;
}

h1 { font-size: 1.9rem; line-height: 1.25; margin: 0.2rem 0 0.6rem; }
h2 { font-size: 1.35rem; line-height: 1.3; margin: 2rem 0 0.6rem; }
h3 { font-size: 1.1rem; margin: 1.4rem 0 0.4rem; }

p { margin: 0.7rem 0; }

a { color: var(--accent); }
a:focus-visible,
summary:focus-visible,
.cta:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.5rem 0.9rem;
  z-index: 10;
  border-radius: 0 0 6px 0;
}
.skip-link:focus {
  left: 0;
}

.draft-banner {
  max-width: var(--max);
  margin: 0 auto;
  background: var(--draft-bg);
  color: var(--draft-fg);
  padding: 0.6rem 1.25rem;
  font-weight: 600;
  border-bottom: 2px solid var(--safety-border);
}

.question { font-size: 1.25rem; font-weight: 600; color: var(--fg); }
.short-answer { font-size: 1.08rem; }
.audience { color: var(--muted); font-size: 0.95rem; }

.cta-row { display: flex; flex-wrap: wrap; gap: 0.6rem; margin: 1.1rem 0; }
.cta {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-fg);
  padding: 0.7rem 1.2rem;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}
.cta:hover { filter: brightness(1.08); }
.cta-secondary {
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
}
.cta-bottom { margin-top: 1.5rem; }

.src-ref { font-size: 0.7em; }
.src-ref a { text-decoration: none; }

ul, ol { padding-left: 1.4rem; }
li { margin: 0.35rem 0; }

.callout {
  border-left: 4px solid var(--tip-border);
  background: var(--tip-bg);
  padding: 0.7rem 1rem;
  border-radius: 0 8px 8px 0;
  margin: 1.2rem 0;
}
.callout-label {
  margin: 0 0 0.2rem;
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}
.callout-safety {
  border-left-color: var(--safety-border);
  background: var(--safety-bg);
  color: var(--safety-fg);
}

.safety-block {
  border: 2px solid var(--safety-border);
  background: var(--safety-bg);
  color: var(--safety-fg);
  padding: 1rem 1.2rem;
  border-radius: 10px;
  margin: 2rem 0;
}
.safety-block h2 { margin-top: 0; }
.safety-block a { color: inherit; }

.table-scroll {
  overflow-x: auto;
  margin: 1.2rem 0;
  border: 1px solid var(--border);
  border-radius: 8px;
}
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.95rem;
}
caption {
  caption-side: top;
  text-align: left;
  color: var(--muted);
  font-size: 0.9rem;
  padding: 0.5rem 0.6rem;
}
th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.7rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--code-bg); }

.faq-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.9rem;
  margin: 0.6rem 0;
}
.faq-item summary { font-weight: 600; cursor: pointer; }
.faq-item[open] summary { margin-bottom: 0.4rem; }

.page-foot {
  margin-top: 2.5rem;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
}
.teach-links { list-style: none; padding-left: 0; }
.bibliography { font-size: 0.95rem; }
.attribution, .translation-note, .provenance, .modified {
  color: var(--muted);
  font-size: 0.9rem;
}

.site-nav {
  max-width: var(--max);
  margin: 0 auto;
  padding: 1.25rem 1.25rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.95rem;
}

.pack-hero { margin: 1.5rem 0; }
.pack-hero img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--border);
}
.pack-hero figcaption {
  margin-top: 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 480px) {
  h1 { font-size: 1.6rem; }
  body { font-size: 1rem; }
}

@media print {
  .cta, .cta-row, .skip-link, .site-nav { display: none; }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: underline; }
  .safety-block, .callout { border-color: #000; background: #fff; color: #000; }
}