/* Teaching3D — readable article layouts. Shared colors, brand, and navigation: chrome.css. */

:root { --measure: 40rem; }

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--f-body);
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}
a { color: var(--azure); }
a:hover { color: #087568; }

/* footer; navigation/brand/tokens are shared with the homepage in chrome.css */
.foot .in { width: min(var(--measure), 100% - 2 * var(--gut)); margin-inline: auto; }
.foot { color: var(--muted); font-size: .88rem; padding: 8px 0 40px; }
.foot a { color: inherit; }

/* the article */
.article { width: min(var(--measure), 100% - 2 * var(--gut)); margin: clamp(28px, 6vw, 64px) auto 40px; }
.article h1, .article h2, .article h3 { font-family: var(--f-head); line-height: 1.2; letter-spacing: -.015em; color: var(--ink); }
.article h1 { font-size: clamp(2.2rem, 7vw, 3.4rem); margin: 0 0 .3em; letter-spacing: -.03em; }
.article h1 span { background: var(--aurora); -webkit-background-clip: text; background-clip: text; color: transparent; }
.article h2 { font-size: clamp(1.45rem, 3.6vw, 1.85rem); margin: 2.4em 0 .6em; padding-top: 1.2em; border-top: 1px solid var(--line); }
.article h3 { font-size: 1.18rem; margin: 1.9em 0 .45em; }
.article p, .article li { color: var(--ink-2); }
.article li { margin: .35em 0; }
.article li > ul { margin-top: .35em; }

.byline { color: var(--muted); margin: 0 0 1.4em; }
.dedication { font-style: italic; color: var(--muted); border-left: 3px solid var(--teal); padding-left: 1em; margin: 0 0 2em; }

.contents { background: var(--tint); border-radius: 12px; padding: 16px 22px; margin: 0 0 2em; font-size: .95rem; }
.contents strong { font-family: var(--f-head); }
.contents ol { margin: .4em 0 0; padding-left: 1.3em; }
.contents li { margin: .15em 0; }

.article blockquote { margin: 1.4em 0; padding: .2em 0 .2em 1.1em; border-left: 3px solid var(--azure); font-size: 1.05em; }
.article blockquote p { color: var(--ink); }
.tip { background: var(--tint); border-radius: 10px; padding: 12px 16px; }

/* lists of resources */
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.cards li { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; margin: 0; }
.cards a { font-family: var(--f-head); font-size: 1.15rem; text-decoration: none; }
.cards p { margin: .3em 0 0; }

/* testimonials: a wider page, quotes in columns */
.article.wide { width: min(72rem, 100% - 2 * var(--gut)); }
body:has(.article.wide) .foot .in { width: min(72rem, 100% - 2 * var(--gut)); }
.article.wide > h1, .article.wide > .byline, .article.wide > p { max-width: var(--measure); }
.quotes { columns: 3 20rem; column-gap: 18px; margin: 2em 0; }
.quotes figure { break-inside: avoid; margin: 0 0 18px; background: var(--paper); border: 1px solid var(--line);
  border-radius: 14px; padding: 18px 20px; }
.quotes blockquote { margin: 0; padding: 0; border: 0; font-size: .95rem; }
.quotes blockquote p { color: var(--ink-2); margin: 0 0 .6em; }
.quotes figcaption { font-size: .9rem; line-height: 1.4; }
.quotes figcaption strong { display: block; font-family: var(--f-head); color: var(--ink); }
.quotes figcaption span { color: var(--muted); }
.quotes .note { font-size: .82rem; color: var(--muted); font-style: italic; margin: .5em 0 0; }
.older { font-size: .9rem; color: var(--muted); }

/* the shared contact details (includes/contact-address.php) and small asides */
.contact-card { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 18px 22px; margin: 1em 0 1.6em; }
.contact-card p { margin: .4em 0; }
.contact-card .address { font-size: 1.25rem; color: var(--ink); }
.contact-card .address i { color: var(--muted); }
.aside { font-size: .95rem; color: var(--muted); }

/* software page: badges, app cards, free / non-free columns */
.badge { display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .03em; line-height: 1.5;
  padding: .05em .6em; border-radius: 99px; margin-right: .35em; vertical-align: .15em; white-space: nowrap; }
.badge.free { background: #dff5ea; color: #0f5b37; }
.badge.paid { background: #fde8d8; color: #7a3410; }
.badge.foss { background: #087568; color: #fff; }
.soon { display: inline-block; font-size: .72em; font-weight: 600; padding: .1em .6em; border-radius: 99px;
  background: #f0a33a; color: #1a1205; white-space: nowrap; vertical-align: .1em; }
.legend { font-size: .92rem; color: var(--muted); max-width: var(--measure); }
.apps-grid { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: 14px; }
.apps-grid li { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; margin: 0; }
.apps-grid h3 { margin: 0 0 .3em; font-size: 1.15rem; }
.apps-grid h3 a { text-decoration: none; }
.apps-grid p { margin: .3em 0 0; font-size: .95rem; }
.apps-grid .badges { margin: 0; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.two-col > section { background: var(--paper); border: 1px solid var(--line); border-radius: 14px; padding: 6px 20px 14px; }
.app-list { list-style: none; padding: 0; margin: 0; }
.app-list li { padding: .55em 0; border-top: 1px solid var(--line); margin: 0; }
.app-list li:first-child { border-top: 0; }
.app-list a { font-weight: 600; text-decoration: none; margin-right: .4em; }
.app-list .what { display: block; font-size: .9rem; color: var(--muted); }
.sub { color: var(--muted); margin-top: -.4em; }
.aside-quote { border-left: 3px solid var(--teal); padding-left: 1em; font-style: normal; }
.get-note { background: var(--tint); border-radius: 12px; padding: 12px 16px; max-width: var(--measure); }
.apps-grid li { display: flex; flex-direction: column; }
.apps-grid .get { margin-top: auto; padding-top: .8em; display: flex; flex-wrap: wrap; gap: 8px; }
.get-btn { display: inline-block; background: var(--ink); color: var(--paper); text-decoration: none; font-weight: 600;
  font-size: .9rem; padding: .5em 1em; border-radius: 99px; }
.get-btn:hover { background: var(--azure); color: #fff; }
.app-list li::after { content: ""; display: block; clear: both; }
.app-list .dl { float: right; font-size: .88rem; font-weight: 600; margin: .15em 0 0 .8em; }
@media (max-width: 680px) { .two-col { grid-template-columns: 1fr; } }

/* bigger lead paragraph; two-column cards; the About page's head and facts */
.lede-big { font-size: 1.18rem; line-height: 1.6; color: var(--ink); }
.cards.two { grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr)); }
.cards strong + p { margin-top: .3em; }
.about-head { display: grid; grid-template-columns: 180px minmax(0, 1fr); gap: 26px; align-items: center; margin: .8em 0 1.6em; }
.about-head .portrait { display: block; width: 180px; max-width: 100%; height: auto; aspect-ratio: 1; border-radius: 50%; object-fit: cover; border: 1px solid var(--line); box-shadow: var(--shadow); }
.about-head .lede-big { margin: 0; }
.facts-row { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 0 0 1.5em; }
.facts-row li { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; margin: 0;
  font-size: .85rem; color: var(--muted); }
.facts-row b { display: block; font-family: var(--f-head); font-size: 1.3rem; color: var(--ink); }
@media (max-width: 560px) { .about-head { grid-template-columns: 1fr; justify-items: start; gap: 18px; } .facts-row { grid-template-columns: 1fr 1fr; } }

.steps-list { padding-left: 1.3em; }
.steps-list li { margin: .5em 0; }
.steps-list b { color: var(--ink); }

/* AI pages */
.uses li { margin: .55em 0; }
.grunt { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.grunt li { margin: 0; background: var(--paper); border: 1px solid var(--line); border-radius: 99px; padding: .35em .9em; font-weight: 600; color: var(--ink); font-size: .95rem; }
.pull-line { font-family: var(--f-head); font-size: 1.25rem; line-height: 1.4; color: var(--ink); border-left: 3px solid var(--teal); padding-left: 1em; }
.cards strong { font-family: var(--f-head); font-size: 1.1rem; }

/* a story told in the first person, set apart from the guide */
.story { background: var(--paper); border: 1px solid var(--line); border-radius: 16px;
  padding: clamp(18px, 4vw, 34px); margin: 2.6em 0; }
.story h2 { border-top: 0; padding-top: 0; margin-top: 0; }
.story .sub { color: var(--muted); margin-top: -.3em; }

@media print {
  body { background: #fff; font-size: 12pt; }
  .top, .foot, .contents { display: none; }
  .article { width: auto; margin: 0; }
}

.credits-link { text-align: center; font-size: .85rem; margin: 1.5em 0 0; }
.app-preview { margin: 1.5em 0; }
.app-preview img { width: 100%; height: auto; border-radius: 16px; }

.article h1 span { background-image: linear-gradient(105deg, #155cb8, #087e95 38%, #087568 64%, #168044); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--azure); outline-offset: 4px; }

.skip-link { position: fixed; left: 16px; top: -120px; z-index: 2000; padding: 12px 18px; background: #fff; color: #0a0e13; border: 2px solid #155cb8; border-radius: 8px; }
.skip-link:focus { top: 12px; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation: none !important; transition: none !important; } }

.thinking-aside { padding: 22px 26px; margin: 2em 0; background: var(--tint); border: 1px solid var(--line); border-radius: 16px; }
.thinking-aside h2 { border: 0; padding: 0; margin: 0 0 .6em; }

/* Keep the inquiry fields close to the opening, including on phones. */
.contact-page > h2:first-of-type { margin-top: 1em; padding-top: .7em; }