:root {
  --ink: #1f2a37;
  --muted: #5b6672;
  --line: #d9dee3;
  --paper: #ffffff;
  --alt: #f6f7f4;
  --navy: #0072B2;
  --orange: #E69F00;
  --green: #3B7A2A;
  --green-light: #E3F0DD;
  --red: #C0504D;
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 64px; }
body { margin: 0; font-family: var(--sans); color: var(--ink); background: var(--paper); line-height: 1.5; font-size: 16px; }
.wrap { max-width: 1140px; margin: 0 auto; padding: 0 20px; }
.top { position: sticky; top: 0; z-index: 10; background: rgba(255,255,255,.96); border-bottom: 1px solid var(--line); backdrop-filter: blur(4px); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; gap: 16px; }
.brand { font-family: var(--serif); font-weight: bold; color: var(--ink); text-decoration: none; font-size: 18px; white-space: nowrap; }
.nav { display: flex; gap: 14px; overflow-x: auto; }
.nav a { color: var(--muted); text-decoration: none; font-size: 14px; white-space: nowrap; padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a.on { color: var(--navy); border-bottom-color: var(--navy); }
.hero { padding: 56px 0 40px; background: linear-gradient(180deg, #f3f7f2 0%, #ffffff 100%); border-bottom: 1px solid var(--line); }
.kicker { text-transform: uppercase; letter-spacing: .08em; font-size: 12px; color: var(--muted); margin: 0 0 12px; }
h1 { font-family: var(--serif); font-size: 36px; line-height: 1.2; margin: 0 0 16px; max-width: 900px; }
h2 { font-family: var(--serif); font-size: 26px; line-height: 1.25; margin: 0 0 12px; display: flex; align-items: baseline; gap: 12px; }
h2 .num { font-family: var(--sans); font-size: 13px; color: var(--paper); background: var(--ink); border-radius: 999px; min-width: 26px; height: 26px; display: inline-flex; align-items: center; justify-content: center; }
h3 { font-family: var(--serif); font-size: 19px; margin: 28px 0 8px; }
.lede { max-width: 900px; color: var(--ink); margin: 0 0 16px; }
.small { font-size: 14px; color: var(--muted); }
.note { font-size: 13px; color: var(--muted); margin: 6px 0 0; max-width: 900px; }
.block { padding: 48px 0; border-bottom: 1px solid var(--line); }
.block.alt { background: var(--alt); }
.tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 12px; margin-top: 24px; }
.tile { background: var(--paper); border: 1px solid var(--line); border-radius: 8px; padding: 14px 16px; }
.tile .v { font-family: var(--serif); font-size: 30px; line-height: 1.1; color: var(--navy); }
.tile .v.warn { color: var(--red); }
.tile .v.good { color: var(--green); }
.tile .l { font-size: 13px; color: var(--muted); margin-top: 6px; }
.controls { display: flex; flex-wrap: wrap; gap: 10px 22px; margin: 12px 0 10px; align-items: center; }
.controls label { font-size: 14px; color: var(--muted); display: inline-flex; flex-direction: column; gap: 3px; }
.controls label input[type=checkbox] { margin-right: 6px; }
.controls.grid4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
select, input[type=number] { font: inherit; font-size: 14px; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--paper); color: var(--ink); max-width: 100%; }
input[type=range] { width: 220px; vertical-align: middle; }
.chart { width: 100%; min-height: 380px; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; }
.chart.tall { min-height: 620px; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 10px; }
@media (max-width: 860px) { .two { grid-template-columns: 1fr; } h1 { font-size: 28px; } }
.result { background: var(--paper); border: 1px solid var(--line); border-left: 4px solid var(--navy); border-radius: 8px; padding: 12px 16px; margin: 10px 0; font-size: 15px; }
.result b { font-family: var(--serif); font-size: 20px; }
.result .ok { color: var(--green); font-weight: 600; }
.result .no { color: var(--red); font-weight: 600; }
.table-wrap { overflow-x: auto; background: var(--paper); border: 1px solid var(--line); border-radius: 8px; margin-top: 8px; }
table { border-collapse: collapse; width: 100%; font-size: 13px; }
th, td { text-align: left; padding: 6px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 600; color: var(--muted); background: #fafbfa; position: sticky; top: 0; }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }
tr.hit td { background: var(--green-light); }
.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; background: var(--green-light); color: var(--green); }
.badge.no { background: #f9e3e2; color: var(--red); }
.foot { padding: 28px 0; color: var(--muted); font-size: 13px; }
code { font-family: Consolas, Menlo, monospace; font-size: 13px; background: #eef0ee; padding: 1px 4px; border-radius: 4px; }

#diff-table { font-size: 12px; }
.two .table-wrap { max-height: 420px; overflow: auto; }

/* ---------- opening picture and tours ---------- */
.hero-fig { position: relative; display: grid; grid-template-columns: 1fr 300px; gap: 18px; margin-top: 22px; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 14px; }
.hero-stage { position: relative; min-height: 420px; }
.hero-canvas { display: block; width: 100%; height: 420px; }
.hero-tip { position: absolute; display: none; background: var(--ink); color: #fff; font-size: 12px; padding: 6px 8px; border-radius: 6px; pointer-events: none; max-width: 220px; line-height: 1.35; z-index: 3; }
.hero-read { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.hero-read .kicker { margin: 0; }
.hero-read .t { font-family: var(--serif); font-size: 22px; line-height: 1.2; margin: 0; min-height: 54px; }
.hero-read .s { font-size: 13px; color: var(--muted); margin: 0; min-height: 60px; }
.hero-nums { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 6px; }
.hero-nums .n { border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
.hero-nums .n .v { font-family: var(--serif); font-size: 26px; line-height: 1.1; color: var(--navy); }
.hero-nums .n .v.cm { color: var(--orange); }
.hero-nums .n .l { font-size: 11px; color: var(--muted); margin-top: 3px; }
.hero-steps { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 8px; }
.hero-steps button, .key-btn { font: inherit; font-size: 11px; padding: 2px 7px; border: 1px solid var(--line); border-radius: 999px; background: #f3f5f3; color: var(--muted); cursor: pointer; }
.hero-steps button:hover, .key-btn:hover { background: #e7ebe6; }
.hero-steps button.on, .key-btn.on { background: var(--green-light); color: var(--green); border-color: var(--green); }
.tour-pill { position: absolute; top: 8px; right: 8px; z-index: 4; font: inherit; font-size: 12px; padding: 3px 12px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255,255,255,.95); color: var(--ink); cursor: pointer; }
.tour-pill.on { background: var(--ink); color: #fff; border-color: var(--ink); }
.tour-host { position: relative; }
@media (max-width: 860px) { .hero-fig { grid-template-columns: 1fr; } .hero-canvas, .hero-stage { height: 360px; min-height: 360px; } }

/* ---------- the study at a glance ---------- */
.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-top: 18px; }
.flow .node { position: relative; background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 12px 12px 10px; cursor: pointer; transition: border-color .25s, box-shadow .25s, transform .25s; }
.flow .node.on { border-color: var(--navy); box-shadow: 0 0 0 3px rgba(0,114,178,.15); transform: translateY(-2px); }
.flow .node .k { font-size: 11px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.flow .node .v { font-family: var(--serif); font-size: 24px; color: var(--navy); line-height: 1.1; margin: 4px 0 2px; }
.flow .node .l { font-size: 12px; color: var(--ink); }
.flow .node.data .v { color: var(--green); }
.flow .node.model .v { color: var(--orange); }
.flow-detail { background: var(--paper); border: 1px solid var(--line); border-left: 4px solid var(--navy); border-radius: 8px; padding: 12px 16px; margin-top: 12px; min-height: 120px; }
.flow-detail h4 { margin: 0 0 6px; font-family: var(--serif); font-size: 18px; }
.flow-detail p { margin: 4px 0; font-size: 14px; }
.flow-detail .io { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 12px; margin-top: 8px; font-size: 13px; }
.flow-detail .io div { border-top: 2px solid var(--line); padding-top: 6px; }
.flow-detail .io b { display: block; font-size: 12px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: 3px; }
@media (max-width: 860px) { .flow-detail .io { grid-template-columns: 1fr; } }

/* ---------- simulation cards ---------- */
.sim { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 14px; }
.sim .card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 14px 16px; position: relative; }
.sim .card h3 { margin: 0 0 6px; padding-right: 96px; }
.sim .card .chart { min-height: 260px; border: 0; }
.param-table td:first-child { white-space: nowrap; }
@media (max-width: 860px) { .sim { grid-template-columns: 1fr; } }

/* ---------- provenance ---------- */
.trace { font-size: 12px; color: var(--muted); margin: -4px 0 14px; }
.trace a { color: var(--navy); text-decoration: none; border-bottom: 1px dotted var(--navy); }
.trace a:hover { border-bottom-style: solid; }
details.prov { margin-top: 10px; font-size: 13px; color: var(--muted); }
details.prov summary { cursor: pointer; }
details.prov table { margin-top: 6px; }
.check-ok { color: var(--green); font-weight: 600; }
.check-bad { color: var(--red); font-weight: 600; }
.src-list { font-size: 13px; padding-left: 18px; }
.src-list li { margin: 4px 0; }
.src-list a { color: var(--navy); }

/* ---------- tabs ---------- */
.view { display: none; }
.view.on { display: block; }
.nav.tabs a { padding: 6px 2px; font-size: 14px; }
.nav.tabs a.on { color: var(--ink); border-bottom-color: var(--orange); font-weight: 600; }
.tall-table { max-height: 480px; overflow: auto; }
.atlas-grid { display: grid; grid-template-columns: 3fr 2fr; gap: 18px; margin-top: 10px; }
@media (max-width: 860px) { .atlas-grid { grid-template-columns: 1fr; } }
.hero .tiles { margin-top: 20px; }

/* ---------- the credit ledger ---------- */
.ledger { padding: 10px 0 4px; }
.ledger .track { position: relative; height: 54px; background: #f6f7f4; border: 1px solid var(--line); border-radius: 6px; display: flex; overflow: visible; }
.ledger .seg { height: 100%; transition: width .75s cubic-bezier(.65,0,.35,1); border-right: 1px solid rgba(0,0,0,.35); display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 600; color: var(--ink); overflow: hidden; white-space: nowrap; }
.ledger .seg:last-child { border-right: 0; }
.ledger .mark { position: absolute; top: -8px; bottom: -8px; width: 0; border-left: 2px solid var(--green); z-index: 2; }
.ledger .mark span { position: absolute; top: -16px; left: -12px; font-size: 11px; color: var(--green); font-weight: 600; white-space: nowrap; }
.ledger .mark.pub { border-left: 2px dashed var(--muted); }
.ledger .mark.pub span { color: var(--muted); font-weight: 400; top: auto; bottom: -18px; left: -40px; }
.ledger .total { margin-top: 26px; font-size: 14px; color: var(--muted); }
.ledger .total .v { font-family: var(--serif); font-size: 30px; color: var(--ink); }
.ledger .legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 12px; color: var(--muted); margin-top: 8px; }
.ledger .legend i { display: inline-block; width: 12px; height: 12px; border: 1px solid #555; margin-right: 5px; vertical-align: -2px; }