/* TerraBrain library pages: same instrument-panel look as the chat, tuned for long reading. */
@font-face { font-family: "Saira"; src: url(/fonts/saira.woff2) format("woff2-variations"); font-weight: 100 900; font-stretch: 50% 125%; font-display: swap; }
@font-face { font-family: "Barlow"; src: url(/fonts/barlow-400.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Barlow"; src: url(/fonts/barlow-600.woff2) format("woff2"); font-weight: 600; font-display: swap; }
:root {
  --bg: #0f1a22; --plate: #172631; --plate-2: #1c2e3a; --line: #2b3f4c; --line-2: #3d5564;
  --steel: #9fb2be; --text: #e8eef2; --body: #d4dee4; --dim: #8297a4; --amber: #a78bfa; --amber-ink: #170c33; --cyan: #5fc8e8;
  color-scheme: dark;
}
* { box-sizing: border-box; }
body {
  margin: 0; color: var(--text); font: 400 1.06rem/1.65 "Barlow", system-ui, sans-serif; -webkit-font-smoothing: antialiased;
  background:
    linear-gradient(rgba(95,200,232,.03) 1px, transparent 1px) 0 0/32px 32px,
    linear-gradient(90deg, rgba(95,200,232,.03) 1px, transparent 1px) 0 0/32px 32px, var(--bg);
}
a { color: var(--cyan); text-underline-offset: 3px; }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }
.top { display: flex; align-items: center; gap: 20px; padding: 14px clamp(16px, 4vw, 40px); border-bottom: 1px solid var(--line); background: rgba(15,26,34,.85); position: sticky; top: 0; backdrop-filter: blur(6px); z-index: 5; }
.brand { font: 700 1.25rem "Saira", sans-serif; font-stretch: 112%; color: var(--text); text-decoration: none; display: inline-flex; align-items: center; gap: 10px; }
.brand::before { content: ""; width: 30px; height: 30px; background: url(/brand/terrabrain-emblem.svg) center/contain no-repeat; }
.top nav { margin-left: auto; display: flex; gap: 18px; font: 600 .95rem "Saira", sans-serif; }
.top nav a { color: var(--steel); text-decoration: none; }
.top nav a:last-child { color: var(--amber-ink); background: var(--amber); padding: 6px 14px; }
main { max-width: 760px; margin: 0 auto; padding: 28px clamp(16px, 4vw, 40px) 60px; }
.crumbs { font-size: .9rem; color: var(--dim); }
.crumbs a { color: var(--steel); }
h1 { font: 700 clamp(1.9rem, 4.6vw, 2.8rem)/1.08 "Saira", sans-serif; font-stretch: 112%; margin: 14px 0 10px; letter-spacing: -.01em; }
h2 { font: 700 1.45rem/1.2 "Saira", sans-serif; font-stretch: 106%; margin: 2.2em 0 .5em; padding-top: .6em; border-top: 1px solid var(--line); }
h3 { font: 600 1.15rem/1.3 "Saira", sans-serif; margin: 1.6em 0 .4em; }
p, li { color: var(--body); }
.meta { color: var(--dim); font-size: .9rem; margin: 0 0 22px; }
.lead { font-size: 1.15rem; color: var(--text); background: var(--plate); border-left: 3px solid var(--amber); padding: 14px 18px; }
.lead strong { color: var(--amber); font-family: "Saira", sans-serif; }
article ul, article ol { padding-left: 1.3em; }
table { width: 100%; border-collapse: collapse; margin: 1.2em 0; font-size: .95rem; display: block; overflow-x: auto; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-family: "Saira", sans-serif; color: var(--cyan); font-weight: 600; }
sup.cite { font-size: .7em; line-height: 0; }
sup.cite a { text-decoration: none; padding: 0 2px; color: var(--amber); }
.ask { margin: 36px 0; background: var(--plate); box-shadow: inset 0 0 0 1px var(--line-2); padding: 18px; }
.ask label { display: block; font: 700 1.15rem "Saira", sans-serif; margin-bottom: 10px; }
.ask__row { display: flex; gap: 8px; }
.ask input[name=q] { flex: 1; min-width: 0; background: var(--bg); color: var(--text); border: 0; box-shadow: inset 0 0 0 1px var(--line-2); padding: 11px 14px; font: inherit; }
.ask input[name=q]:focus { outline: none; box-shadow: inset 0 0 0 1px var(--cyan); }
.ask button { background: var(--amber); color: var(--amber-ink); border: 0; padding: 0 22px; font: 700 1rem "Saira", sans-serif; cursor: pointer; }
.ask p { margin: 10px 0 0; font-size: .9rem; color: var(--dim); }
.faq details { border-bottom: 1px solid var(--line); padding: 10px 0; }
.faq summary { cursor: pointer; font-weight: 600; color: var(--text); }
.faq details p { margin: 8px 0 0; }
.sources ol { padding-left: 1.4em; font-size: .92rem; }
.sources li { margin: 6px 0; scroll-margin-top: 80px; }
.sources li:target { background: rgba(167,139,250,.12); }
.sources span { color: var(--dim); }
.list { list-style: none; padding: 0; margin: 16px 0; }
.list li { padding: 12px 0; border-bottom: 1px solid var(--line); }
.list a { font: 600 1.05rem "Saira", sans-serif; text-decoration: none; display: block; }
.list span { display: block; font-size: .92rem; color: var(--dim); margin-top: 2px; }
.sec h2 a { color: var(--text); text-decoration: none; }
.foot { border-top: 1px solid var(--line); padding: 26px clamp(16px, 4vw, 40px) 40px; max-width: 760px; margin: 0 auto; font-size: .88rem; color: var(--dim); }
.foot p { color: var(--dim); }
.foot nav { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.foot nav a { color: var(--steel); }
@media (max-width: 560px) { .top nav a:not(:last-child) { display: none; } }
.qa { margin: 10px 0 0; }
.qa dt { margin-top: 14px; font: 600 1.02rem/1.35 "Saira", sans-serif; }
.qa dt a { text-decoration: none; }
.qa dd { margin: 4px 0 0; color: var(--body); font-size: .96rem; }
.count { font: 500 .85rem "Barlow", sans-serif; color: var(--dim); margin-left: 8px; }
h2[id], h3[id], details[id] { scroll-margin-top: 80px; }
h2[id]:target, h3[id]:target, details[id]:target { color: var(--amber); }
code { background: var(--plate-2); padding: 1px 6px; font-size: .9em; }
@media (max-width: 760px) { .top nav a:not(:last-child):not(:first-child) { display: none; } }
.fbk { margin: 34px 0 0; padding-top: 16px; border-top: 1px solid var(--line); font-size: .95rem; }
.fbk button { background: var(--plate); color: var(--text); border: 0; box-shadow: inset 0 0 0 1px var(--line-2); padding: 4px 14px; font: 600 .9rem "Saira", sans-serif; cursor: pointer; margin-left: 6px; }
.fbk button.is-on { box-shadow: inset 0 0 0 1px var(--amber); }
.fbk form { display: grid; gap: 8px; margin-top: 10px; }
.fbk label { color: var(--body); }
.fbk textarea { background: var(--bg); color: var(--text); border: 0; box-shadow: inset 0 0 0 1px var(--line-2); padding: 10px; font: inherit; }
.fbk form button { justify-self: start; background: var(--amber); color: var(--amber-ink); box-shadow: none; margin: 0; padding: 8px 18px; }
.fbk__done { color: var(--cyan); }
.legal { margin-top: 12px; }
.case { display: flex; flex-wrap: wrap; gap: 6px; margin: -8px 0 20px; }
.case span { background: var(--plate-2); color: var(--steel); font-size: .85rem; padding: 3px 10px; box-shadow: inset 0 0 0 1px var(--line); }