/* Factum — site styles. Dark-first, matching the extension's logo palette. */
:root {
  --bg: #14111c;
  --bg-alt: #1b1726;
  --surface: #221d33;
  --surface-2: #2a2440;
  --border: #332c4a;
  --ink: #ece9f5;
  --muted: #a49dbd;
  --accent: #c58af9;
  --accent-strong: #a855f7;
  --amber: #f5b32e;
  --radius: 12px;
  --wrap: 1080px;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { width: min(100% - 48px, var(--wrap)); margin-inline: auto; }

/* ---------------------------------------------------------------- header -- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(20, 17, 28, 0.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  min-height: 62px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }

.nav-links { display: flex; gap: 18px; margin-left: auto; flex-wrap: wrap; }
.nav-links a { color: var(--muted); font-size: 14.5px; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--ink); text-decoration: none; }

/* ---------------------------------------------------------------- buttons -- */

.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 9px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 550;
}
.button:hover { text-decoration: none; }

.button.primary { background: var(--accent-strong); color: #fff; }
.button.primary:hover { background: #9333ea; }

.button.ghost { border-color: var(--border); color: var(--ink); background: var(--surface); }
.button.ghost:hover { border-color: var(--accent); }

/* ------------------------------------------------------------------- hero -- */

.hero { padding: 76px 0 40px; text-align: center; }

.hero h1 {
  margin: 0 0 14px;
  font-size: clamp(38px, 6vw, 60px);
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero .lede {
  margin: 0 auto 10px;
  max-width: 660px;
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--muted);
}

.eyebrow {
  display: inline-block;
  margin-bottom: 20px;
  padding: 5px 13px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--accent);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 28px; }

.shot {
  margin: 48px auto 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.5);
  background: var(--surface);
}
.shot img { display: block; width: 100%; height: auto; }
.shot figcaption {
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 13.5px;
}

/* --------------------------------------------------------------- sections -- */

section { padding: 60px 0; }
section.alt { background: var(--bg-alt); border-block: 1px solid var(--border); }

h2 {
  margin: 0 0 10px;
  font-size: clamp(26px, 3.4vw, 34px);
  letter-spacing: -0.02em;
}

h3 { margin: 32px 0 8px; font-size: 20px; letter-spacing: -0.01em; }

.section-lede { max-width: 680px; color: var(--muted); margin: 0 0 28px; }

.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(268px, 1fr)); }

.card {
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.card h3 { margin: 0 0 8px; font-size: 17.5px; }
.card p { margin: 0; color: var(--muted); font-size: 14.8px; }

.card .mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 14px;
  border-radius: 9px;
  background: var(--surface-2);
  color: var(--accent);
  font-size: 17px;
}

/* ------------------------------------------------------------------- code -- */

pre {
  margin: 16px 0;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #100e17;
  overflow-x: auto;
  font: 13.5px/1.65 var(--mono);
}
code { font-family: var(--mono); font-size: 0.92em; }
p code, li code, td code {
  padding: 1.5px 5px;
  border-radius: 5px;
  background: var(--surface-2);
  color: #e3d5fb;
}
pre .c { color: #7d769b; }
pre .k { color: var(--accent); }
pre .s { color: #9fd39a; }

/* ------------------------------------------------------------------ prose -- */

.prose { max-width: 760px; }
.prose p, .prose li { color: #d5d1e4; }
.prose ul, .prose ol { padding-left: 22px; }
.prose li { margin: 6px 0; }
.prose h2 { margin-top: 46px; padding-top: 8px; }
.prose h2:first-of-type { margin-top: 0; }

.page-head { padding: 56px 0 8px; }
.page-head h1 { margin: 0 0 8px; font-size: clamp(30px, 4.6vw, 42px); letter-spacing: -0.025em; }
.page-head p { margin: 0; color: var(--muted); font-size: 18px; }

.toc {
  margin: 0 0 34px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}
.toc strong { display: block; margin-bottom: 6px; font-size: 13px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.toc ul { margin: 0; padding-left: 18px; }

/* ----------------------------------------------------------------- tables -- */

.table-scroll { overflow-x: auto; margin: 18px 0; }

table { width: 100%; border-collapse: collapse; font-size: 14.6px; }
th, td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--muted); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 0.05em; }
tbody tr:hover td { background: var(--surface); }

kbd {
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--surface-2);
  font: 12.5px var(--mono);
  white-space: nowrap;
}

/* ------------------------------------------------------------------- misc -- */

.note {
  margin: 22px 0;
  padding: 14px 18px;
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  background: var(--surface);
  color: #d5d1e4;
  font-size: 15px;
}

.steps { counter-reset: step; list-style: none; padding: 0; }
.steps > li {
  position: relative;
  margin: 0 0 22px;
  padding-left: 46px;
}
.steps > li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: -2px;
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--surface-2);
  color: var(--accent);
  font-size: 14px;
  font-weight: 650;
}

details {
  margin: 10px 0;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}
summary { cursor: pointer; font-weight: 550; }
details[open] summary { margin-bottom: 8px; }

.pill {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--accent);
  font-size: 12.5px;
  font-family: var(--mono);
}

/* ----------------------------------------------------------------- footer -- */

footer {
  padding: 46px 0 60px;
  margin-top: 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14.5px;
}
.foot-grid { display: grid; gap: 26px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.foot-grid h4 { margin: 0 0 8px; color: var(--ink); font-size: 14px; }
.foot-grid ul { margin: 0; padding: 0; list-style: none; }
.foot-grid li { margin: 5px 0; }
.foot-grid a { color: var(--muted); }
.foot-grid a:hover { color: var(--accent); }
.colophon { margin-top: 34px; padding-top: 20px; border-top: 1px solid var(--border); font-size: 13.5px; }

@media (max-width: 640px) {
  .nav-links { gap: 14px; }
  .nav-links a { font-size: 14px; }
  section { padding: 44px 0; }
}

/* Prose stays at a readable measure, but tables and code — which are scanned,
   not read line by line — break out wider once there is room for it. */
@media (min-width: 1128px) {
  .prose .table-scroll,
  .prose pre {
    margin-inline: -90px;
  }
}

/* ------------------------------------------------------------------- book -- */

.chapter-number {
  margin: 0 0 6px !important;
  color: var(--accent) !important;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.figure {
  margin: 30px 0;
  padding: 20px 20px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-alt);
  text-align: center;
}
.figure img { max-width: 100%; height: auto; }
.figure { line-height: 0; }
.figure figcaption { line-height: 1.6; }
.figure figcaption {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
  text-align: left;
}
.figure figcaption a { white-space: nowrap; }

@media (min-width: 1128px) {
  .prose .figure { margin-inline: -90px; }
}

.chapter-nav {
  display: flex;
  gap: 14px;
  justify-content: space-between;
  margin-top: 52px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}
.chapter-nav a {
  display: block;
  flex: 1;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 550;
}
.chapter-nav a:hover { border-color: var(--accent); text-decoration: none; }
.chapter-nav a span { display: block; color: var(--muted); font-size: 12.5px; font-weight: 400; }
.chapter-nav .next { text-align: right; }

.contents { counter-reset: chapter; list-style: none; padding: 0; margin: 0; }
.contents li { margin: 0 0 10px; }
.contents a {
  display: flex;
  gap: 16px;
  align-items: baseline;
  padding: 15px 20px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--ink);
}
.contents a:hover { border-color: var(--accent); text-decoration: none; }
.contents .num { color: var(--accent); font-family: var(--mono); font-size: 13.5px; }
.contents .what { color: var(--muted); font-size: 14px; display: block; font-weight: 400; }

/* ------------------------------------------------------- surfaces & badges -- */

/* A row of small labels — the interchange formats, the generation targets. */
.badges { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 22px; }
.badges.left { justify-content: flex-start; }
.badges span {
  padding: 5px 11px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  color: var(--muted);
  font: 13px var(--mono);
}
.badges span b { color: var(--accent); font-weight: 500; }

/* Two columns that stay readable when they collapse to one. */
.split { display: grid; gap: 26px; align-items: start; }
@media (min-width: 860px) { .split { grid-template-columns: 1fr 1fr; gap: 34px; } }
.split > div > :first-child { margin-top: 0; }
.split h3 { margin: 0 0 10px; font-size: 17.5px; }
.split p { color: var(--muted); margin: 0 0 14px; }

/* --------------------------------------------------------------- compare -- */

.compare { font-size: 14.4px; }
.compare th, .compare td { white-space: nowrap; }
.compare tbody th {
  white-space: normal;
  text-transform: none;
  letter-spacing: 0;
  font-size: 14.4px;
  color: var(--ink);
  font-weight: 500;
  min-width: 220px;
}
.compare thead th.ours { color: var(--accent); }
/* The column that is ours, tinted the whole way down. */
.compare td.ours, .compare thead th.ours { background: rgba(168, 85, 247, 0.09); }
.compare tbody tr:hover td.ours { background: rgba(168, 85, 247, 0.14); }

.mk { font-family: var(--mono); margin-right: 7px; }
.mk.y { color: #6dd39a; }
.mk.p { color: var(--amber); }
.mk.n { color: #e2707f; }

.legend { display: flex; flex-wrap: wrap; gap: 6px 20px; color: var(--muted); font-size: 13.5px; margin: 0; }

/* -------------------------------------------------------------- highlight -- */

/* One claim, given room. Used sparingly — it loses force if repeated. */
.claim {
  margin: 30px 0;
  padding: 26px 30px;
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(168,85,247,.10), rgba(168,85,247,.03));
}
.claim p { margin: 0; font-size: 19px; line-height: 1.5; color: var(--ink); max-width: 62ch; }
.claim p em { color: var(--accent); font-style: normal; font-weight: 600; }

/* A diff block, coloured the way a reviewer expects. */
pre .add { color: #6dd39a; }
pre .del { color: #e2707f; }

/* Stat strip. */
.stats { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); margin: 26px 0 0; }
.stat {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
}
.stat b { display: block; font-size: 24px; color: var(--accent); letter-spacing: -0.02em; font-family: var(--mono); }
.stat span { color: var(--muted); font-size: 13.5px; }