:root {
  --paper: #f3efe6; --paper-2: #ebe6da; --card: #fbf9f4; --ink: #1b1a17; --ink-2: #57534b; --ink-3: #8c877c;
  --rule: #d6d0c2; --blue: #2f3fd9; --blue-soft: #dfe2fb; --dot: #e4472a; --good: #047857;
  --serif: "Instrument Serif", "Times New Roman", serif;
  --sans: "Inter Tight", system-ui, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, monospace;
  color-scheme: light;
}
/* light is the default; the header toggle sets data-theme="dark" */
:root[data-theme="dark"] {
  --paper: #161512; --paper-2: #211f1b; --card: #1f1d19; --ink: #f3efe6; --ink-2: #cfc9bc; --ink-3: #8f897d;
  --rule: #3a3730; --blue: #6f7cff; --blue-soft: #262a52; --dot: #ff6a4d; --good: #34d399;
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body { background: var(--paper); color: var(--ink); font: 400 18px/1.55 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img, svg { display: block; }
code, pre { font-family: var(--mono); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
@media (max-width: 600px) { .wrap { padding: 0 16px; } }

/* hard-shadow card, the house style */
.card { background: var(--card); border: 2px solid var(--ink); border-radius: 12px; box-shadow: 5px 5px 0 var(--ink); }
.label { font: 500 13px/1 var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }

/* top bar */
.top { padding: 22px 0; }
.top .wrap { display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font: 600 21px var(--sans); letter-spacing: -.015em; }
.brand img { width: 36px; height: 36px; }
.mark-dark { display: none; }
:root[data-theme="dark"] .mark-light { display: none; } :root[data-theme="dark"] .mark-dark { display: block; }
.top nav { margin-left: auto; display: flex; gap: 22px; font: 500 15px var(--mono); }
.top nav a { text-decoration: none; color: var(--ink-2); }
.top nav a:hover { color: var(--ink); }
.theme { display: grid; place-items: center; width: 34px; height: 34px; margin-left: 4px; border: 2px solid var(--ink); border-radius: 8px;
  background: var(--card); color: var(--ink); box-shadow: 2px 2px 0 var(--ink); cursor: pointer; transition: transform .08s, box-shadow .08s; }
.theme:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--ink); }
.theme svg { width: 17px; height: 17px; }
.theme .moon { display: block; } .theme .sun { display: none; }
:root[data-theme="dark"] .theme .moon { display: none; } :root[data-theme="dark"] .theme .sun { display: block; }
@media (max-width: 600px) { .top nav .hide-sm { display: none; } }

/* hero */
.hero { padding: 72px 0 84px; }
.hero h1 { font: 400 clamp(52px, 9vw, 112px)/.92 var(--serif); letter-spacing: -.03em; max-width: 900px; }
.hero h1 em { color: var(--blue); }
.hero p { font-size: clamp(19px, 2.2vw, 23px); color: var(--ink-2); max-width: 620px; margin-top: 26px; }
.btns { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 36px; }
.btn { font: 500 16px/1 var(--mono); text-decoration: none; padding: 13px 18px; border: 2px solid var(--ink); border-radius: 9px;
  background: var(--card); box-shadow: 3px 3px 0 var(--ink); transition: transform .08s, box-shadow .08s; }
.btn:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn.primary { background: var(--blue); color: var(--paper); }

/* model section */
.model { border-top: 2px solid var(--ink); padding: 72px 0 40px; }
.model-head { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 56px; align-items: start; }
@media (max-width: 1060px) { .model-head { grid-template-columns: 1fr; gap: 44px; } }
.model .label { margin-bottom: 22px; }
.wordmark { font: 400 clamp(96px, 14vw, 168px)/.8 var(--serif); letter-spacing: -.035em; margin-left: -6px; }
.wordmark .i { position: relative; display: inline-block; }
.wordmark .i svg { position: absolute; left: 50%; transform: translateX(-46%); top: .115em; width: .22em; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.chip { font: 500 15px/1 var(--mono); padding: 8px 12px; border: 2px solid var(--ink); border-radius: 8px; background: var(--card); box-shadow: 3px 3px 0 var(--ink); }
.chip.t { background: var(--blue); color: var(--paper); }
.role { font: 400 italic 40px/1.1 var(--serif); margin-top: 28px; }
.pitch { color: var(--ink-2); margin-top: 12px; max-width: 520px; }
.meta { display: flex; flex-wrap: wrap; gap: 10px 28px; margin-top: 30px; font: 500 13px/1 var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); }
.meta b { color: var(--ink); font-weight: 500; }

/* state -> answers demo */
.win { overflow: hidden; }
.win .bar { display: flex; align-items: center; gap: 12px; padding: 9px 14px; border-bottom: 2px solid var(--ink); background: var(--paper-2); font: 500 15px var(--mono); }
.win .lights { display: flex; gap: 6px; } .win .lights i { width: 12px; height: 12px; border: 2px solid var(--ink); border-radius: 50%; }
.win .lights i:first-child { background: var(--dot); }
.win .bar .tag { margin-left: auto; color: var(--ink-3); letter-spacing: .12em; text-transform: uppercase; font-size: 12px; }
.win .body { padding: 18px 20px 20px; font-size: 19px; line-height: 1.45; }
.pass { display: flex; align-items: center; gap: 12px; margin: 16px 0 16px 20px; font: 500 13px var(--mono); letter-spacing: .14em; text-transform: uppercase; color: var(--blue); }
.answers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 560px) { .answers { grid-template-columns: 1fr; } }
.ans { padding: 12px 14px 14px; display: flex; flex-direction: column; min-height: 176px; }
.ans .q { display: flex; justify-content: space-between; gap: 8px; font: 500 14px var(--mono); }
.ans .q span:first-child { color: var(--blue); } .ans .q span:last-child { color: var(--ink-3); font-weight: 400; }
.ans .big { font: 400 46px/1 var(--serif); margin-top: 12px; } .ans .big small { font: 400 italic 21px var(--serif); color: var(--ink-2); margin-left: 5px; }
.split { display: flex; height: 14px; border: 1.5px solid var(--ink); border-radius: 3px; overflow: hidden; margin-top: auto; }
.split i { background: var(--blue); width: 0; transition: width .7s cubic-bezier(.2,.8,.2,1); }
.lab { display: flex; justify-content: space-between; font: 12px var(--mono); color: var(--ink-3); margin-top: 5px; }
.bars { margin-top: auto; display: grid; gap: 7px; font: 13px var(--mono); }
.bars div { display: grid; grid-template-columns: auto minmax(24px, 1fr) auto; gap: 8px; align-items: center; }
.bars span:last-child { color: var(--ink-3); text-align: right; }
.bars .track { height: 11px; border: 1.5px solid var(--ink); border-radius: 3px; overflow: hidden; } .bars .track i { display: block; height: 100%; width: 0; background: var(--blue); transition: width .7s cubic-bezier(.2,.8,.2,1); }
.hist { margin-top: auto; display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; align-items: end; height: 64px; }
.hist i { height: 0; border: 1.5px solid var(--ink); border-bottom-width: 2px; border-radius: 2px 2px 0 0; background: var(--card); transition: height .7s cubic-bezier(.2,.8,.2,1); }
.hist i.on { background: var(--blue); }
.histlab { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; text-align: center; font: 12px var(--mono); color: var(--ink-3); margin-top: 5px; }
.histlab .on { color: var(--blue); }
.illus { text-align: right; font: 12px var(--mono); color: var(--ink-3); margin-top: 10px; }

/* content blocks */
.section { padding: 56px 0 0; }
.section h2 { font: 400 clamp(36px, 5vw, 52px)/1 var(--serif); letter-spacing: -.02em; margin-bottom: 20px; }
.section h2 em { color: var(--blue); }
.section > .wrap > p, .section .lead { color: var(--ink-2); max-width: 680px; margin-bottom: 22px; }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
@media (max-width: 800px) { .grid3 { grid-template-columns: 1fr; } }
.qt { padding: 18px 20px 20px; }
.qt code { font: 500 15px var(--mono); color: var(--blue); }
.qt p { margin-top: 8px; color: var(--ink-2); font-size: 17px; }

.results { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; align-items: start; }
@media (max-width: 860px) { .results { grid-template-columns: 1fr; } }
.tbl { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 16px; }
th, td { padding: 10px 16px; border-bottom: 1px solid var(--rule); text-align: right; white-space: nowrap; }
th:first-child, td:first-child { text-align: left; }
th { font: 500 12px var(--mono); letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); border-bottom: 2px solid var(--ink); }
tr:last-child td { border-bottom: 0; }
td b { color: var(--blue); font-weight: 600; }
td.delta { font: 13px var(--mono); color: var(--ink-3); }
td.delta.up { color: var(--good); }
.stats .stat { padding: 16px 20px; border-bottom: 1px solid var(--rule); }
.stats .stat:last-child { border-bottom: 0; }
.stat .n { font: 400 54px/1 var(--serif); letter-spacing: -.02em; } .stat .n em { color: var(--blue); font-style: normal; }
.stat .n small { font: 400 italic 22px var(--serif); color: var(--ink-3); margin-left: 6px; }
.stat .k { margin-top: 6px; }
.note { font-size: 15px; color: var(--ink-3); margin-top: 14px; max-width: 760px; }
.note code { font-size: 13.5px; }

pre { padding: 18px 20px; overflow-x: auto; font-size: 14px; line-height: 1.6; }
pre .s { color: var(--good); } pre .c { color: var(--ink-3); }


footer { padding: 28px 0 40px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 14px 28px; align-items: center; font: 14px var(--mono); color: var(--ink-3); }
footer .brand { font-size: 17px; color: var(--ink); }
footer .brand img { width: 28px; height: 28px; }
footer nav { margin-left: auto; display: flex; gap: 22px; }
footer a { text-decoration: none; } footer a:hover { color: var(--ink); }

/* ---------- ticker ---------- */
.ticker { background: var(--blue); border-top: 2px solid var(--ink); border-bottom: 2px solid var(--ink); overflow: hidden; color: var(--paper); }
.ticker-track { display: flex; width: max-content; animation: tick 60s linear infinite; }
.ticker:hover .ticker-track { animation-play-state: paused; }
.tk { font: 500 15px/1 var(--mono); padding: 15px 26px; white-space: nowrap; border-right: 2px solid color-mix(in srgb, var(--paper) 25%, transparent); }
.tk b { font-weight: 500; opacity: .75; }
.tk i { font-style: normal; background: var(--paper); color: var(--blue); border-radius: 4px; padding: 2px 6px; margin-left: 4px; }
@keyframes tick { to { transform: translateX(-50%); } }
@media (prefers-reduced-motion: reduce) { .ticker-track { animation: none; } }

/* ---------- demo tabs ---------- */
.demo .tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.demo .tabs button { font: 500 13.5px/1 var(--mono); padding: 8px 11px; border: 2px solid var(--ink); border-radius: 8px; background: var(--card); color: var(--ink);
  cursor: pointer; box-shadow: 2px 2px 0 var(--ink); transition: transform .08s, box-shadow .08s; }
.demo .tabs button:hover { transform: translate(-1px, -1px); box-shadow: 3px 3px 0 var(--ink); }
.demo .tabs button[aria-selected="true"] { background: var(--ink); color: var(--paper); }
.demo .win .body { min-height: 92px; }
.demo .win .body code { font-size: 15px; }
.demo .win .body code.del { color: var(--dot); } .demo .win .body code.add { color: var(--good); }
.demo .win .body .dim { font-size: 15px; color: var(--ink-3); }

/* ---------- chat model vs Tilde ---------- */
.vs { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 20px; }
@media (max-width: 1000px) { .vs { grid-template-columns: 1fr; } }
.vs-side { padding: 18px 20px 20px; display: flex; flex-direction: column; gap: 14px; min-width: 0; }
.vs-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.vs-tag { font: 12px var(--mono); color: var(--ink-3); border: 1.5px solid var(--rule); border-radius: 999px; padding: 3px 9px; }
.vs-side.good .vs-tag { color: var(--blue); border-color: var(--blue); }
.vs-side.good .label { color: var(--blue); }
.chatty { font: 400 italic 22px/1.4 var(--serif); color: var(--ink-2); }
.chatty u { text-decoration-color: var(--dot); text-decoration-thickness: 2px; text-underline-offset: 3px; }
.vs-foot { font-size: 15px; color: var(--ink-3); margin-top: auto; }
.vs-foot code { font-size: 13px; color: var(--ink-2); }
pre.json { margin: 0; padding: 0; background: none; font-size: 13px; line-height: 1.6; overflow-x: auto; }
pre.json .k { color: var(--ink); } pre.json .s { color: var(--good); } pre.json .n { color: var(--blue); font-weight: 500; } pre.json .c { color: var(--ink-3); }

/* ---------- use cases ---------- */
.uses { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border-top: 2px solid var(--ink); }
@media (max-width: 860px) { .uses { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .uses { grid-template-columns: 1fr; } }
.use { padding: 22px 22px 26px 0; border-bottom: 1px solid var(--rule); }
.use-n { font: 500 13px var(--mono); color: var(--blue); }
.use h3 { font: 400 30px/1.05 var(--serif); margin: 8px 0 8px; letter-spacing: -.01em; }
.use p { font-size: 16.5px; color: var(--ink-2); max-width: 320px; }

/* ---------- results chart ---------- */
.chart { position: relative; padding: 16px 18px 12px; }
.chart-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 8px; }
.legend { display: flex; gap: 18px; font: 500 14px var(--mono); }
.legend span { display: flex; align-items: center; gap: 7px; }
.dot { display: inline-block; width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--card); box-sizing: content-box; }
.dot.tilde { background: var(--blue); } .dot.jev { background: var(--ink-3); }
.legend .dot, .tip .dot { border: 0; }
.row, .axis { display: grid; grid-template-columns: 128px minmax(0, 1fr) 52px; gap: 12px; align-items: center; }
@media (max-width: 560px) { .row, .axis { grid-template-columns: 96px minmax(0, 1fr) 44px; gap: 8px; } }
.row { padding: 7px 0; border-radius: 6px; outline: none; cursor: default; }
.row:hover, .row:focus-visible { background: var(--paper-2); }
.row.agg { margin-top: 8px; border-top: 1px dashed var(--rule); padding-top: 13px; border-radius: 0; }
.rname { font-size: 15px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.row.agg .rname { color: var(--ink-3); }
.row.agg .plot { height: auto; font: 13px var(--mono); color: var(--ink-3); }
.plot { position: relative; height: 18px; }
.plot .link { position: absolute; top: 8px; height: 2px; background: var(--rule); }
.plot .link.ahead { background: color-mix(in srgb, var(--blue) 45%, transparent); }
.plot .dot { position: absolute; top: 1px; transform: translateX(-50%); }
.plot .dot.tilde { transition: left 1s cubic-bezier(.2,.8,.2,1); z-index: 1; }
.rdelta { font: 13px var(--mono); color: var(--ink-3); text-align: right; }
.rdelta.up { color: var(--good); }
.axis { margin-top: 6px; border-top: 1px solid var(--rule); padding-top: 6px; }
.axis .plot span { position: absolute; transform: translateX(-50%); font: 12px var(--mono); color: var(--ink-3); }
.tip { position: absolute; left: 50%; transform: translateX(-50%); display: none; gap: 12px; align-items: center; background: var(--ink); color: var(--paper);
  padding: 7px 12px; border-radius: 8px; font: 13px var(--mono); white-space: nowrap; z-index: 2; pointer-events: none; }
.tip.on { display: flex; }
.tip span { display: inline-flex; align-items: center; gap: 6px; } .tip .up { color: #6ee7b7; }
.table-view { margin-top: 14px; }
.table-view summary { cursor: pointer; font: 500 14px var(--mono); color: var(--ink-2); }
.table-view .tbl { margin-top: 12px; max-width: 680px; }
td b.j { color: var(--ink); }

/* ---------- quickstart copy ---------- */
.code { position: relative; }
.copy { position: absolute; top: 12px; right: 12px; font: 500 12px var(--mono); padding: 6px 10px; border: 2px solid var(--ink); border-radius: 7px;
  background: var(--paper-2); color: var(--ink); cursor: pointer; }
.copy:hover { background: var(--blue); color: var(--paper); }

/* ---------- closing call to action ---------- */
.cta { margin-top: 96px; padding: 80px 0; background: var(--ink); color: var(--paper); }
.cta h2 { font: 400 clamp(44px, 7vw, 88px)/.95 var(--serif); letter-spacing: -.025em; max-width: 820px; }
.cta h2 em { color: color-mix(in srgb, var(--blue) 55%, var(--paper)); }
.cta .btn { border-color: var(--paper); box-shadow: 3px 3px 0 var(--paper); background: var(--ink); color: var(--paper); }
.cta .btn.primary { background: var(--blue); color: var(--paper); }