/* BIM Open Toolkit family page. Tokens from docs/BRANDING.md; the toolkit is the hub and uses the
   text colour where a product would use its accent. */
:root {
  --font-brand: "Instrument Sans", "Public Sans", "Segoe UI", system-ui, sans-serif;
  --font-ui: "Public Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "Fira Code", "Cascadia Mono", Consolas, ui-monospace, monospace;
  --text: #171a1f;
  --dim: #5a606c;
  --surface: #ffffff;
  --bg: #f4f5f7;
  --border: #e3e6ea;
  --edge: #cfd4db;
  --code-bg: #171a1f;
  --code-text: #e9ebef;
  --flow: #2f66ce;
  --flow-soft: #e8eefb;
  --notebook: #5a47c7;
  --notebook-soft: #ece8fb;
  --viewer: #0f8a80;
  --viewer-soft: #e2f3f1;
  --data: #b8326e;
  --data-soft: #f9e6ef;
  --schema: #4f5d78;
  --schema-soft: #e9ecf2;
  --plot: #a16207;
  --plot-soft: #f6efdb;
  --green: #16a34a;
  --amber: #d97706;
  --mark-plate: transparent;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #e9ebef;
    --dim: #a3a9b4;
    --surface: #1d2026;
    --bg: #141619;
    --border: #2c3038;
    --edge: #434955;
    --code-bg: #0d0f12;
    --flow-soft: #1d2a42;
    --notebook-soft: #252040;
    --viewer-soft: #15302d;
    --data-soft: #3a1c2a;
    --schema-soft: #262b36;
    /* The marks are one-colour files in the light accents; a light plate keeps them legible. */
    --mark-plate: #eef0f3;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 15px/1.55 var(--font-ui);
  overflow-wrap: break-word;
}
img { max-width: 100%; }
a { color: inherit; text-decoration-color: var(--edge); text-underline-offset: 3px; }
a:hover { text-decoration-color: currentColor; }
code { font: 400 0.87em var(--font-mono); }
p code, td code, summary code { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; overflow-wrap: anywhere; }

h1, h2, h3 { font-family: var(--font-brand); line-height: 1.2; letter-spacing: -0.01em; }
h2 { font-size: 24px; font-weight: 700; margin: 0 0 6px; }

.wordmark { font-family: var(--font-brand); letter-spacing: -0.01em; }
.wordmark .family { font-weight: 600; color: var(--dim); margin-right: 0.27em; }
.wordmark .product { font-weight: 700; color: var(--text); }

/* Top bar */
.topbar { background: var(--surface); border-bottom: 1px solid var(--border); }
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 8px 24px; flex-wrap: wrap;
}
.home { display: flex; align-items: center; gap: 10px; text-decoration: none; font-size: 18px; }
.marks { display: inline-flex; gap: 3px; }
.marks img { width: 22px; height: 22px; display: block; background: var(--mark-plate); border-radius: 4px; }
nav { display: flex; gap: 4px 18px; flex-wrap: wrap; font-size: 14px; font-weight: 500; }
nav a { text-decoration: none; color: var(--dim); }
nav a:hover { color: var(--text); }

main { max-width: 1080px; margin: 0 auto; padding: 0 16px 48px; }
section { margin-top: 56px; }
.section-lede { color: var(--dim); margin: 0 0 20px; max-width: 72ch; }

/* Opening */
.hero { margin-top: 44px; }
.hero h1 { font-size: clamp(26px, 4.2vw, 40px); font-weight: 700; margin: 0 0 16px; max-width: 24em; }
.lede { font-size: 17px; margin: 0 0 18px; max-width: 70ch; }
.facts { display: flex; flex-wrap: wrap; gap: 8px; margin: 0; padding: 0; }
.facts span {
  font: 500 12.5px/1.4 var(--font-mono); color: var(--dim);
  background: var(--surface); border: 1px solid var(--border); border-radius: 999px; padding: 4px 10px;
}

/* Demo tiles */
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 420px), 1fr)); gap: 20px; }
.tile {
  display: flex; flex-direction: column; text-decoration: none; color: inherit;
  background: var(--surface); border: 1px solid var(--border); border-top: 4px solid var(--accent);
  border-radius: 10px; overflow: hidden; transition: border-color 0.15s, box-shadow 0.15s;
}
.tile:hover, .tile:focus-visible { border-color: var(--accent); box-shadow: 0 4px 18px rgb(0 0 0 / 0.08); outline: none; }
.tile .shot {
  display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; object-fit: cover; object-position: left top;
  border-bottom: 1px solid var(--border);
}
.tile-body { display: flex; flex-direction: column; gap: 8px; padding: 18px 20px 20px; flex: 1; }
.tile-head { display: flex; align-items: center; gap: 8px; font-size: 15px; }
.tile-head img { width: 22px; height: 22px; background: var(--mark-plate); border-radius: 4px; }
.tile-title { font: 700 20px/1.25 var(--font-brand); }
.tile-text { font-size: 14.5px; color: var(--dim); }
.tile-cta { margin-top: auto; padding-top: 6px; font-weight: 600; color: var(--accent); }
.tile:hover .tile-cta { text-decoration: underline; text-underline-offset: 3px; }

/* Repository cards */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 16px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-top: 3px solid var(--accent, var(--text));
  border-radius: 8px; padding: 16px 18px; display: flex; flex-direction: column; gap: 10px;
}
.card p { margin: 0; font-size: 14px; }
.card-head { display: flex; align-items: center; gap: 10px; }
.card-head > img, .no-mark { width: 32px; height: 32px; flex: none; background: var(--mark-plate); border-radius: 6px; }
.no-mark { border: 2px dashed var(--edge); }
.card-head h3 { font-size: 16px; margin: 0; }
.repo { font: 400 12px var(--font-mono); color: var(--dim); }
.hub-marks { display: grid; grid-template-columns: 1fr 1fr; gap: 1px; width: 32px; height: 32px; flex: none; }
.hub-marks img { width: 15px; height: 15px; background: var(--mark-plate); border-radius: 2px; }
.card .status { font-size: 13px; color: var(--dim); border-left: 3px solid var(--edge); padding-left: 10px; }
.status strong { color: var(--text); font-weight: 600; }
.status.done { border-left-color: var(--green); }
.status.moving { border-left-color: var(--amber); }
.status.hub-status { border-left-color: var(--text); }
.card .links { margin-top: auto; display: flex; gap: 6px 18px; flex-wrap: wrap; font-weight: 500; }

.phases { margin-top: 20px; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; }
.phases summary { cursor: pointer; padding: 12px 16px; font-weight: 500; }
.table-wrap { overflow-x: auto; border-top: 1px solid var(--border); }
table { border-collapse: collapse; font-size: 14px; width: 100%; }
th, td { text-align: left; padding: 8px 16px; border-bottom: 1px solid var(--border); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { font-weight: 600; }
td.ok { color: var(--green); font-weight: 600; }
td.busy { color: var(--amber); font-weight: 600; }

/* How the pieces fit: four tiers, top builds on what is below it. */
.stack { list-style: none; margin: 0 0 20px; padding: 0; display: flex; flex-direction: column; gap: 22px; }
.tier { display: grid; gap: 12px; position: relative; }
.tier + .tier::before {
  content: ""; position: absolute; left: 50%; top: -20px; height: 18px; border-left: 2px solid var(--edge);
}
.tier + .tier::after {
  content: ""; position: absolute; left: calc(50% - 5px); top: -8px;
  border: 6px solid transparent; border-top-color: var(--edge); border-bottom: 0;
}
.tier-3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 240px), 1fr)); }
.tier-4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 180px), 1fr)); }
.node {
  background: var(--surface); border: 1px solid var(--border); border-left: 4px solid var(--accent, var(--text));
  border-radius: 6px; padding: 10px 14px; display: flex; flex-direction: column; gap: 2px;
}
.node-name { font: 500 14px var(--font-mono); }
.node-role { font-size: 13.5px; }
.node-uses { font: 400 12px var(--font-mono); color: var(--dim); }
.node.lib { border-left-color: var(--edge); border-style: dashed; border-left-style: solid; }
.node.lib .node-role { color: var(--dim); }

/* Run it yourself */
.steps { list-style: none; counter-reset: step; margin: 0 0 16px; padding: 0; display: flex; flex-direction: column; gap: 18px; max-width: 760px; }
.steps li { counter-increment: step; position: relative; padding-left: 40px; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0; width: 26px; height: 26px; border-radius: 50%;
  background: var(--text); color: var(--bg); font: 600 13px/26px var(--font-ui); text-align: center;
}
.step-title { display: block; font-weight: 600; margin: 2px 0 8px; }
.steps p { margin: 8px 0 0; font-size: 14px; color: var(--dim); }
pre {
  margin: 0; background: var(--code-bg); color: var(--code-text); border-radius: 8px; padding: 12px 16px;
  overflow-x: auto; font-size: 13.5px; line-height: 1.6;
}
#run > p { max-width: 72ch; }

footer { border-top: 1px solid var(--border); margin-top: 24px; }
.footer-inner { max-width: 1080px; margin: 0 auto; padding: 20px 16px 32px; color: var(--dim); font-size: 13px; }
.footer-inner p { margin: 0; }

@media (max-width: 520px) {
  body { font-size: 14.5px; }
  section { margin-top: 44px; }
  .hero { margin-top: 28px; }
  .lede { font-size: 16px; }
  .tile-body { padding: 14px 16px 16px; }
  .steps li { padding-left: 34px; }
}