/* AI Frontier (/ai/): a dark "tech" look, only on pages with body.ai-section (set in ai/_metadata.yml).
   Palette: night blue background, cyan for links and lines, amber (the site's own accent, lighter) for dates. */
body.ai-section {
  --ai-bg: #0a0f1c; --ai-bg2: #060a14; --ai-panel: #111a2e; --ai-panel2: #16213a; --ai-line: #1f2d4d;
  --ai-text: #dbe4f3; --ai-muted: #9aa8c4; --ai-dim: #6f7d99; --ai-cyan: #4fd1e8; --ai-amber: #f3b55c; --ai-white: #ffffff;
  --ai-mono: "JetBrains Mono", ui-monospace, Consolas, monospace;
  --ai-head: "Space Grotesk", "Segoe UI", Arial, sans-serif;
  --bs-body-bg: var(--ai-bg); --bs-body-color: var(--ai-text); --bs-emphasis-color: var(--ai-white);
  --bs-secondary-color: var(--ai-muted); --bs-border-color: var(--ai-line); --bs-link-color: var(--ai-cyan);
  --bs-link-hover-color: #9be8f5; --bs-heading-color: var(--ai-white);
  background-color: var(--ai-bg);
  background-image:
    linear-gradient(rgba(79, 209, 232, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 209, 232, .04) 1px, transparent 1px);
  background-size: 32px 32px;
  color: var(--ai-text);
}
.ai-section a { color: var(--ai-cyan); }
.ai-section a:hover { color: #9be8f5; }
.ai-section strong, .ai-section b { color: var(--ai-white); }
.ai-section h1, .ai-section h2, .ai-section h3, .ai-section h4 { color: var(--ai-white); font-family: var(--ai-head); }
.ai-section h1.title { font-weight: 700; letter-spacing: -.01em; }
.ai-section h2 { border-bottom: 1px solid var(--ai-line); padding-bottom: .3rem; }
.ai-section h2::before { content: "// "; color: var(--ai-cyan); font-family: var(--ai-mono); font-weight: 400; }
.ai-section .quarto-title .subtitle, .ai-section .description { color: var(--ai-muted); }
.ai-section .quarto-title-meta-heading, .ai-section .quarto-title-meta-contents { color: var(--ai-muted); }
.ai-section code { background: var(--ai-panel2); color: var(--ai-cyan); }
.ai-section hr { border-color: var(--ai-line); opacity: 1; }
.ai-section .mono { font-family: var(--ai-mono); }

/* navbar and footer go dark on these pages; a thin cyan line instead of the amber bar */
.ai-section .navbar { background-color: var(--ai-bg2) !important; border-bottom: 1px solid var(--ai-cyan); }
.ai-section .nav-footer { background: var(--ai-bg2); color: var(--ai-dim); border-top: 1px solid var(--ai-line); }
.ai-section .nav-footer a { color: var(--ai-muted); }
.ai-section #quarto-header { background: var(--ai-bg2); }

/* table of contents on the right */
.ai-section #TOC .toc-title, .ai-section nav[role="doc-toc"] h2 { color: var(--ai-dim); font-family: var(--ai-mono); font-size: .8rem; }
.ai-section nav[role="doc-toc"] h2::before { content: none; }
.ai-section #TOC a, .ai-section nav[role="doc-toc"] a { color: var(--ai-muted) !important; border-left-color: var(--ai-line) !important; }
.ai-section #TOC a.active, .ai-section nav[role="doc-toc"] a.active { color: var(--ai-cyan) !important; border-left-color: var(--ai-cyan) !important; }
/* the landing page says it in its own lead line: no repeated description under the title */
.ai-home .quarto-title-block .description { display: none; }

/* ---------- landing page ---------- */
.ai-hero { padding: .5rem 0 1rem; }
.ai-prompt { font-family: var(--ai-mono); color: var(--ai-cyan); font-size: .9rem; margin-bottom: .4rem; }
.ai-prompt::after { content: "_"; margin-left: .15rem; animation: ai-blink 1.1s steps(1) infinite; }
@keyframes ai-blink { 50% { opacity: 0; } }
.ai-lead { font-size: 1.15rem; color: var(--ai-muted); max-width: 40rem; }

.ai-doors { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: .9rem; margin: 1.4rem 0 .5rem; }
.ai-door { display: block; background: var(--ai-panel); border: 1px solid var(--ai-line); border-radius: 10px;
  padding: 1rem 1.1rem; text-decoration: none; color: var(--ai-text) !important; transition: border-color .2s, transform .2s; }
.ai-door:hover { border-color: var(--ai-cyan); transform: translateY(-2px); }
.ai-door .num { font-family: var(--ai-mono); font-size: .78rem; color: var(--ai-cyan); }
.ai-door .name { font-family: var(--ai-head); font-weight: 600; font-size: 1.2rem; color: var(--ai-white); margin: .15rem 0 .25rem; }
.ai-door .what { font-size: .92rem; color: var(--ai-muted); }

/* the strip of eight milestones on the landing page */
.ai-strip { position: relative; display: grid; grid-template-columns: repeat(8, minmax(0, 1fr)); margin: 1.2rem 0 .5rem; }
.ai-strip::before { content: ""; position: absolute; left: 6%; right: 6%; top: 8px; height: 2px; background: #24406a; }
.ai-node { position: relative; text-align: center; text-decoration: none; padding: 0 .15rem; }
.ai-node .dot { display: block; width: 18px; height: 18px; margin: 0 auto; border-radius: 50%;
  border: 2px solid var(--ai-cyan); background: var(--ai-bg); transition: background .2s, box-shadow .2s; }
.ai-node:hover .dot, .ai-node:focus .dot { background: var(--ai-cyan); box-shadow: 0 0 0 5px rgba(79, 209, 232, .18); }
.ai-node .yr { display: block; font-family: var(--ai-mono); font-size: .8rem; color: var(--ai-amber); margin-top: .35rem; }
.ai-node .lbl { display: block; font-size: .8rem; color: var(--ai-muted); line-height: 1.25; }
@media (max-width: 640px) {
  .ai-strip { grid-template-columns: repeat(4, minmax(0, 1fr)); row-gap: 1rem; }
  .ai-strip::before { display: none; }
}

.ai-howto { display: grid; grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr)); gap: .6rem; margin: .8rem 0; }
.ai-howto div { border: 1px dashed var(--ai-line); border-radius: 8px; padding: .6rem .8rem; font-size: .92rem; color: var(--ai-muted); }
.ai-howto b { display: block; font-family: var(--ai-mono); font-size: .8rem; color: var(--ai-cyan); font-weight: 500; }

/* ---------- news cards (listing template ai/_ai-news.ejs) ---------- */
.ai-news { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: .9rem; margin: 1rem 0; }
.ai-news > li { margin: 0; }
.ai-card { display: flex; flex-direction: column; height: 100%; background: var(--ai-panel); border: 1px solid var(--ai-line);
  border-radius: 10px; padding: .9rem 1rem; text-decoration: none; color: var(--ai-text) !important; transition: border-color .2s, transform .2s; }
.ai-card:hover { border-color: var(--ai-cyan); transform: translateY(-2px); }
.ai-card .top { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.ai-tag { font-family: var(--ai-mono); font-size: .72rem; padding: .05rem .5rem; border-radius: 4px; border: 1px solid #2b4a6e; color: #8fd8ea; }
.ai-card .date { font-family: var(--ai-mono); font-size: .75rem; color: var(--ai-amber); }
.ai-card .t { font-family: var(--ai-head); font-weight: 600; font-size: 1.08rem; color: var(--ai-white); margin: .55rem 0 .3rem; line-height: 1.3; }
.ai-card .d { font-size: .9rem; color: var(--ai-muted); flex: 1; }
.ai-card .more { font-family: var(--ai-mono); font-size: .78rem; color: var(--ai-cyan); margin-top: .6rem; }
.ai-section .quarto-listing-category-title { color: var(--ai-dim); font-family: var(--ai-mono); font-size: .8rem; }
.ai-section .quarto-listing-category .category { color: var(--ai-muted); }
.ai-section .quarto-listing-category .category.active { color: var(--ai-cyan); }
.ai-section .quarto-listing-filter input, .ai-section .input-group-text { background: var(--ai-panel); color: var(--ai-text); border-color: var(--ai-line); }

/* ---------- timeline page ---------- */
.ai-rail { position: relative; padding-left: 1.6rem; margin: 1rem 0 2rem; }
.ai-rail::before { content: ""; position: absolute; left: 6px; top: .4rem; bottom: .4rem; width: 2px; background: #24406a; }
.ai-ms { position: relative; background: var(--ai-panel); border: 1px solid var(--ai-line); border-radius: 10px;
  padding: .8rem 1rem .6rem; margin: 0 0 .9rem; scroll-margin-top: 5rem; }
.ai-ms::before { content: ""; position: absolute; left: calc(-1.6rem + 0px); top: 1.05rem; width: 14px; height: 14px; border-radius: 50%;
  border: 2px solid var(--ai-cyan); background: var(--ai-bg); }
.ai-ms:target { border-color: var(--ai-cyan); }
.ai-ms:target::before { background: var(--ai-cyan); }
.ai-ms h3 { margin: .1rem 0 .4rem; font-size: 1.2rem; }
.ai-ms p { margin-bottom: .5rem; }
.ai-year { font-family: var(--ai-mono); color: var(--ai-amber); font-size: .85rem; letter-spacing: .04em; }
.ai-why { font-size: .93rem; color: var(--ai-muted); border-top: 1px dashed var(--ai-line); padding-top: .45rem; }
.ai-why::before { content: "why it matters › "; font-family: var(--ai-mono); font-size: .78rem; color: var(--ai-cyan); }
.ai-next { border: 1px dashed var(--ai-cyan); border-radius: 10px; padding: .8rem 1rem; color: var(--ai-muted); }

/* ---------- a news note ---------- */
.ai-take { background: var(--ai-panel); border-left: 3px solid var(--ai-amber); border-radius: 0; padding: .7rem 1rem; margin: 1rem 0; }
.ai-take > :last-child { margin-bottom: 0; }
.ai-note-foot { font-size: .85rem; color: var(--ai-dim); border-top: 1px solid var(--ai-line); padding-top: .6rem; margin-top: 2rem; }

/* ---------- learn page ---------- */
.ai-links > ul { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(16rem, 1fr)); gap: .7rem; }
.ai-links li { background: var(--ai-panel); border: 1px solid var(--ai-line); border-radius: 8px; padding: .65rem .85rem; margin: 0; font-size: .93rem; color: var(--ai-muted); }
.ai-links li a { font-weight: 600; display: block; }

/* cards rise in as they scroll into view (assets/js/ai.js adds .ai-reveal; without the script all stays visible) */
.ai-reveal { opacity: 0; transform: translateY(10px); transition: opacity .5s ease, transform .5s ease; }
.ai-reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .ai-prompt::after { animation: none; }
  .ai-reveal { opacity: 1; transform: none; transition: none; }
  .ai-door, .ai-card { transition: none; }
}

/* ---------- landing v2 (10/15): top 5, tables, apps, months ---------- */
.ai-more { font-family: var(--ai-mono); font-size: .85rem; }
.ai-asof { display: block; font-size: .82rem; color: var(--ai-dim); margin: .3rem 0 .6rem; }
.ai-top { list-style: none; padding: 0; margin: .8rem 0; display: grid; gap: .55rem; }
.ai-top > li { margin: 0; }
.ai-top-item { display: grid; grid-template-columns: 2.4rem minmax(0, 1fr) auto; gap: .8rem; align-items: start;
  background: var(--ai-panel); border: 1px solid var(--ai-line); border-radius: 10px; padding: .75rem 1rem;
  text-decoration: none; color: var(--ai-text) !important; transition: border-color .2s; }
.ai-top-item:hover { border-color: var(--ai-cyan); }
.ai-top-item .rank { font-family: var(--ai-mono); font-size: 1.6rem; line-height: 1.1; color: var(--ai-amber); text-align: center; }
.ai-top-item .t { display: block; font-family: var(--ai-head); font-weight: 600; font-size: 1.08rem; color: var(--ai-white); line-height: 1.3; }
.ai-top-item .d { display: block; font-size: .92rem; color: var(--ai-muted); margin-top: .2rem; }
.ai-top-item .meta { display: flex; flex-direction: column; align-items: flex-end; gap: .35rem; }
.ai-top-item .date { font-family: var(--ai-mono); font-size: .75rem; color: var(--ai-amber); }
@media (max-width: 640px) {
  .ai-top-item { grid-template-columns: 2rem minmax(0, 1fr); }
  .ai-top-item .meta { grid-column: 2; flex-direction: row; align-items: center; }
}
.ai-table table { width: 100%; font-size: .92rem; margin: .5rem 0; color: var(--ai-text); --bs-table-bg: transparent; --bs-table-color: var(--ai-text); }
.ai-table th { color: var(--ai-dim) !important; font-family: var(--ai-mono); font-size: .75rem; font-weight: 500; border-bottom: 1px solid var(--ai-cyan) !important; }
.ai-table td { border-bottom: 1px solid var(--ai-line) !important; background: transparent !important; color: var(--ai-text) !important; }
.ai-table td:first-child { color: var(--ai-white) !important; font-weight: 600; }
.ai-table tr:hover td { background: var(--ai-panel) !important; }
.ai-table > div, .ai-table .table-responsive { overflow-x: auto; }
.ai-apps { display: grid; grid-template-columns: repeat(auto-fill, minmax(15rem, 1fr)); gap: .8rem; margin: .8rem 0; }
.ai-app { display: block; background: var(--ai-panel); border: 1px solid var(--ai-line); border-radius: 10px; padding: .8rem 1rem;
  text-decoration: none; color: var(--ai-text) !important; transition: border-color .2s, transform .2s; }
.ai-app:hover { border-color: var(--ai-cyan); transform: translateY(-2px); }
.ai-app .top { display: flex; justify-content: space-between; align-items: center; gap: .5rem; }
.ai-app .name { font-family: var(--ai-head); font-weight: 600; font-size: 1.05rem; color: var(--ai-white); }
.ai-app .what { display: block; font-size: .9rem; color: var(--ai-muted); margin-top: .35rem; }
.ai-boards { grid-template-columns: repeat(auto-fit, minmax(10rem, 1fr)); }
.ai-months { margin: .8rem 0; border-left: 2px solid #24406a; padding-left: 1rem; }
.ai-month { font-family: var(--ai-mono); color: var(--ai-amber); font-size: .85rem; margin: 1rem 0 .35rem; position: relative; }
.ai-month::before { content: ""; position: absolute; left: calc(-1rem - 7px); top: .3rem; width: 12px; height: 12px; border-radius: 50%;
  border: 2px solid var(--ai-cyan); background: var(--ai-bg); }
.ai-month-item { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: .7rem; row-gap: .1rem; align-items: baseline;
  padding: .45rem .7rem; border-radius: 8px; text-decoration: none; color: var(--ai-text) !important; }
.ai-month-item:hover { background: var(--ai-panel); }
.ai-month-item .t { color: var(--ai-white); font-weight: 600; }
.ai-month-item .d { grid-column: 2; font-size: .88rem; color: var(--ai-muted); }