/* Shared style for the guide, help and trust pages (built by tools/build_pages.py).
   Same palette and type as the home page. Readability per the course: 17px text,
   1.65 line height, short measure, sans-serif [L195]. */
:root {
  --ink: #0b0b0c;
  --ink-2: #55555b;
  --ink-3: #6e6e73;
  --line: #e3e3e8;
  --soft: #f5f5f7;
  --paper: #ffffff;
  --accent: #1a6fd1;
  --accent-soft: #eef5fd;
  --code-bg: #f2f3f5;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --measure: 720px;
  --gutter: 24px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --ink: #f5f5f7;
    --ink-2: #c7c7cc;
    --ink-3: #a1a1a6;
    --line: #2c2c2e;
    --soft: #1c1c1e;
    --paper: #000000;
    --accent: #6fb3ff;
    --accent-soft: #0d1f33;
    --code-bg: #1c1c1e;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 var(--font);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-underline-offset: 2px; }
img { max-width: 100%; height: auto; }

.skip { position: absolute; left: -9999px; }
.skip:focus { left: 16px; top: 12px; z-index: 10; padding: 8px 12px; background: var(--paper); border-radius: 8px; }

/* ---------- top bar ---------- */
.top { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--paper) 88%, transparent); backdrop-filter: saturate(180%) blur(16px); -webkit-backdrop-filter: saturate(180%) blur(16px); border-bottom: 1px solid var(--line); }
.bar { max-width: 1080px; margin: 0 auto; padding: 10px var(--gutter); display: flex; align-items: center; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; font-size: 18px; }
.brand img { border-radius: 7px; }
.bar ul { display: flex; gap: 22px; list-style: none; margin: 0 0 0 auto; padding: 0; }
.bar ul a { color: var(--ink-2); text-decoration: none; font-size: 15px; }
.bar ul a:hover { color: var(--ink); }
.buy { display: inline-block; padding: 9px 16px; border-radius: 999px; background: var(--ink); color: var(--paper); font-weight: 600; font-size: 15px; text-decoration: none; white-space: nowrap; }
.buy:hover { opacity: 0.86; }

/* ---------- article ---------- */
main { max-width: var(--measure); margin: 0 auto; padding: 28px var(--gutter) 72px; }
.crumbs { font-size: 14px; color: var(--ink-3); }
.crumbs a { color: var(--ink-3); text-decoration: none; }
.crumbs a:hover { color: var(--ink); text-decoration: underline; }
h1 { margin: 18px 0 10px; font-size: clamp(32px, 5.4vw, 46px); line-height: 1.1; letter-spacing: -0.03em; }
.byline { margin: 0 0 28px; font-size: 14px; color: var(--ink-3); }
.byline a { color: inherit; }
h2 { margin: 48px 0 12px; font-size: 26px; line-height: 1.25; letter-spacing: -0.02em; }
h3 { margin: 30px 0 8px; font-size: 20px; line-height: 1.3; letter-spacing: -0.01em; }
p, ul, ol { margin: 0 0 16px; }
li { margin: 4px 0; }
strong { font-weight: 650; }

.answer { margin: 0 0 32px; padding: 18px 22px; border-radius: 14px; background: var(--accent-soft); border-left: 4px solid var(--accent); }
.answer p:last-child, .answer ol:last-child, .answer ul:last-child { margin-bottom: 0; }
.note { padding: 14px 18px; border-radius: 12px; background: var(--soft); font-size: 16px; }

code, kbd { font-family: var(--mono); font-size: 0.86em; }
code { padding: 1px 5px; border-radius: 5px; background: var(--code-bg); overflow-wrap: anywhere; }
kbd { padding: 1px 6px; border-radius: 6px; border: 1px solid var(--line); border-bottom-width: 2px; background: var(--soft); white-space: nowrap; }
pre { margin: 0 0 18px; padding: 14px 16px; border-radius: 12px; background: var(--code-bg); overflow-x: auto; font-size: 14px; line-height: 1.5; }
pre code { padding: 0; background: none; overflow-wrap: normal; }

/* Tables fit the column: cells wrap, nothing scrolls sideways. */
table { width: 100%; margin: 0 0 20px; border-collapse: collapse; font-size: 15.5px; line-height: 1.5; }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
th { font-weight: 650; background: var(--soft); }
td code, th code { overflow-wrap: anywhere; }

figure { margin: 8px 0 28px; }
figure img { display: block; border-radius: 12px; box-shadow: 0 0 0 1px var(--line); }
figcaption { margin-top: 10px; font-size: 14.5px; color: var(--ink-3); }

/* ---------- FAQ and references ---------- */
.faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
.faq summary { cursor: pointer; font-weight: 650; list-style: none; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::before { content: "+"; display: inline-block; width: 1.2em; color: var(--accent); font-weight: 700; }
.faq details[open] summary::before { content: "−"; }
.faq details p { margin: 10px 0 0 1.2em; }
.refs ol { font-size: 15px; color: var(--ink-2); }

/* ---------- hub lists ---------- */
.page-list { list-style: none; padding: 0; margin: 0 0 24px; }
.page-list li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.page-list a { font-weight: 650; font-size: 19px; text-decoration: none; }
.page-list a:hover { text-decoration: underline; }
.page-list span { display: block; margin-top: 4px; color: var(--ink-2); font-size: 15.5px; }

/* ---------- closing call to action ---------- */
.cta { margin-top: 56px; padding: 22px; border-radius: 18px; background: var(--soft); display: grid; grid-template-columns: 56px 1fr auto; gap: 18px; align-items: center; }
.cta img { border-radius: 12px; }
.cta p { margin: 0; font-size: 15.5px; color: var(--ink-2); }
.cta .cta-title { color: var(--ink); font-weight: 700; font-size: 17px; margin-bottom: 2px; }

/* ---------- footer ---------- */
.foot { max-width: var(--measure); margin: 0 auto; padding: 28px var(--gutter) 48px; border-top: 1px solid var(--line); font-size: 14px; color: var(--ink-3); }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-bottom: 12px; }
.foot a { color: var(--ink-2); text-decoration: none; }
.foot a:hover { color: var(--ink); text-decoration: underline; }
.foot p { margin: 0; }

@media (max-width: 640px) {
  :root { --gutter: 16px; }
  body { font-size: 16.5px; }
  .bar { gap: 14px; }
  .bar ul { gap: 14px; }
  .bar ul li:nth-child(3) { display: none; }
  .brand span { display: none; }
  h2 { font-size: 23px; }
  .cta { grid-template-columns: 44px 1fr; }
  .cta img { width: 44px; height: 44px; }
  .cta .buy { grid-column: 1 / -1; text-align: center; }
  table { font-size: 14.5px; }
  pre code { white-space: pre-wrap; overflow-wrap: anywhere; }
  th, td { padding: 8px 6px; }
}