:root {
  --navy: #1d3b4f;
  --navy-deep: #142a39;
  --ink: #1b2533;
  --muted: #5d6673;
  --cream: #fbf6e6;
  --paper: #fffdf7;
  --sand: #e9e1c6;
  --sand-deep: #d8cda8;
  --accent: #c7783a;
  --line: #e3dccb;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --radius: 10px;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--cream); color: var(--ink); font: 17px/1.6 var(--sans); }
img { max-width: 100%; height: auto; }
a { color: var(--navy); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.wrap.narrow { max-width: 740px; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; background: #fff; padding: 8px 12px; z-index: 10; }
.muted { color: var(--muted); }

/* header */
.site-header { background: var(--navy-deep); color: #f4ecd2; position: sticky; top: 0; z-index: 5; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; color: #f4ecd2; text-decoration: none; font-weight: 800; font-size: 20px; letter-spacing: .2px; }
.brand:hover { color: #fff; }
.logo { width: 30px; height: 30px; }
.nav { display: flex; gap: 22px; }
.nav a { color: #d9cfae; text-decoration: none; font-weight: 500; font-size: 15px; }
.nav a:hover, .nav a[aria-current] { color: #fff; }

/* hero */
.hero { background: linear-gradient(135deg, var(--navy-deep), var(--navy) 60%, #2c5873); color: #f6efd8; }
.hero-inner { padding: 96px 24px 104px; max-width: 900px; }
.eyebrow { text-transform: uppercase; letter-spacing: .14em; font-size: 12.5px; font-weight: 700; color: #e2b98f; margin: 0 0 14px; }
.eyebrow.dark { color: var(--accent); }
.hero h1 { font-size: clamp(40px, 7vw, 72px); line-height: 1.05; margin: 0 0 22px; letter-spacing: -.02em; font-weight: 800; }
.lede { font-size: 20px; line-height: 1.55; max-width: 720px; margin: 0 0 28px; }
.hero .lede { color: #e7ddc1; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn { display: inline-block; background: var(--accent); color: #fff; padding: 12px 22px; border-radius: 999px; text-decoration: none; font-weight: 600; font-size: 15px; border: 2px solid var(--accent); }
.btn:hover { background: #b4652a; border-color: #b4652a; color: #fff; }
.btn.ghost { background: transparent; color: inherit; border-color: currentColor; }
.btn.ghost:hover { background: rgba(255,255,255,.08); color: inherit; }

/* sections */
.section { padding: 64px 24px; }
.band { background: var(--sand); padding: 64px 0; }
.two-col { display: grid; grid-template-columns: 1fr 1.4fr; gap: 48px; align-items: start; }
.two-col h2 { font-size: 34px; line-height: 1.15; margin: 0; letter-spacing: -.01em; }
.big { font-family: var(--serif); font-size: 21px; line-height: 1.6; margin: 0; }
.section-title { font-size: 30px; margin: 0 0 28px; letter-spacing: -.01em; }
.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.section-head a { font-weight: 600; text-decoration: none; }
.services { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 18px; }
.service { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.service h3 { margin: 0 0 8px; font-size: 19px; color: var(--navy-deep); }
.service p { margin: 0; color: #3b4452; font-size: 15.5px; }
.service.demo .links { margin-top: 14px; font-weight: 600; font-size: 15px; }
.contact-box { background: var(--paper); border-radius: var(--radius); padding: 28px; border: 1px solid var(--line); }
.contact-box h3 { margin: 26px 0 6px; }

/* cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 22px; }
.card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .15s, box-shadow .15s; }
.card:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(20, 42, 57, .1); }
.card-link { color: inherit; text-decoration: none; display: flex; flex-direction: column; height: 100%; }
.card-img { aspect-ratio: 16 / 9; background: var(--navy); overflow: hidden; }
.card-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-noimg { width: 100%; height: 100%; background: linear-gradient(135deg, var(--navy), #3b6680); }
.card-body { padding: 18px 20px 22px; }
.card-body h3 { font-size: 18.5px; line-height: 1.3; margin: 6px 0 8px; color: var(--navy-deep); }
.card-body p { font-size: 15px; color: #4a5260; margin: 0; }
.meta { font-size: 13px; color: var(--muted); }

/* research filters */
.page-head { background: var(--sand); padding: 56px 0 40px; }
.page-head h1 { font-size: clamp(34px, 5vw, 48px); line-height: 1.12; margin: 0 0 16px; letter-spacing: -.02em; }
.filters { margin-top: 18px; }
#q { width: 100%; max-width: 520px; font: inherit; padding: 12px 16px; border: 1px solid var(--sand-deep); border-radius: 999px; background: var(--paper); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.chip { font: 500 14px var(--sans); background: var(--paper); border: 1px solid var(--sand-deep); color: var(--ink); padding: 6px 13px; border-radius: 999px; cursor: pointer; text-decoration: none; }
.chip span { color: var(--muted); font-size: 12.5px; }
.chip.active, .chip:hover { background: var(--navy); color: #fff; border-color: var(--navy); }
.chip.active span, .chip:hover span { color: #cfd9e0; }
.chip.small { font-size: 12.5px; padding: 4px 10px; }

/* post */
.post-head { padding-top: 48px; }
.post-head h1 { font-size: clamp(32px, 5vw, 46px); line-height: 1.12; letter-spacing: -.02em; margin: 14px 0 14px; color: var(--navy-deep); }
.dek { font-family: var(--serif); font-size: 21px; color: #48515f; margin: 0 0 22px; }
.byline { display: flex; align-items: center; gap: 12px; font-size: 14.5px; padding-bottom: 26px; border-bottom: 1px solid var(--line); }
.byline img { border-radius: 50%; }
.byline a { font-weight: 600; text-decoration: none; }
.post-body { font-family: var(--serif); font-size: 20px; line-height: 1.7; padding-top: 24px; padding-bottom: 24px; }
.post-body h2 { font-family: var(--sans); font-size: 27px; line-height: 1.25; margin: 2em 0 .6em; color: var(--navy-deep); letter-spacing: -.01em; }
.post-body h3 { font-family: var(--sans); font-size: 21px; margin: 1.6em 0 .5em; color: var(--navy-deep); }
.post-body p, .post-body ul, .post-body ol { margin: 0 0 1.15em; }
.post-body li { margin-bottom: .4em; }
.post-body blockquote { margin: 1.6em 0; padding: 4px 0 4px 22px; border-left: 3px solid var(--accent); font-style: italic; color: #39414e; }
.post-body figure { margin: 2em 0; }
.post-body figure img { display: block; margin: 0 auto; border-radius: 6px; }
.post-body figcaption { font: 14px/1.5 var(--sans); color: var(--muted); text-align: center; margin-top: 10px; }
.post-body hr { border: 0; text-align: center; margin: 2.4em 0; }
.post-body hr::after { content: "· · ·"; color: var(--muted); letter-spacing: .6em; }
.post-body pre { font: 14.5px/1.55 ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; background: #0f1b26; color: #e6edf3; padding: 18px 20px; border-radius: 8px; overflow-x: auto; white-space: pre; margin: 1.4em 0; }
.post-body pre code.hljs { padding: 0; background: transparent; }
.post-body code { font: .86em ui-monospace, Menlo, Consolas, monospace; background: #efe7cf; padding: 2px 5px; border-radius: 4px; }
.post-body pre code { background: none; padding: 0; font-size: inherit; }
.post-foot { padding-bottom: 24px; border-top: 1px solid var(--line); padding-top: 18px; font-size: 15px; }

/* about */
.about-head { display: grid; grid-template-columns: 300px 1fr; gap: 44px; align-items: center; }
.portrait { width: 300px; height: 300px; object-fit: cover; border-radius: 18px; box-shadow: 0 14px 34px rgba(20, 42, 57, .22); }
.prose h2 { font-size: 26px; margin: 1.6em 0 .5em; color: var(--navy-deep); }
.prose p { font-family: var(--serif); font-size: 19.5px; line-height: 1.7; }

/* footer */
.site-footer { background: var(--navy-deep); color: #d9cfae; padding: 40px 0; margin-top: 40px; font-size: 14.5px; }
.footer-inner { display: grid; grid-template-columns: 1fr 2fr 1fr; gap: 24px; align-items: start; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.site-footer a { color: #f1e7c8; text-decoration: none; }
.site-footer a:hover { color: #fff; }
.site-footer .muted { color: #a9a38d; text-align: right; }

/* demos */
.demo-app { padding-top: 32px; }
.status { background: var(--paper); border: 1px dashed var(--sand-deep); border-radius: var(--radius); padding: 14px 18px; color: var(--muted); }
.demo-grid { display: grid; grid-template-columns: minmax(260px, 340px) 1fr; gap: 22px; align-items: start; margin-bottom: 22px; }
.panel { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px 24px; min-width: 0; }
.panel.wide { margin-bottom: 22px; }
.panel h2 { font-size: 21px; margin: 0 0 14px; color: var(--navy-deep); }
.panel h3 { font-size: 17px; margin: 20px 0 8px; color: var(--navy-deep); }
.panel p { font-size: 15.5px; }
.panel label { display: block; font-size: 14px; font-weight: 600; color: #3b4452; margin: 0 0 14px; }
.panel label output { float: right; font-weight: 700; color: var(--accent); }
.panel input[type=number], .panel select { display: block; width: 100%; margin-top: 6px; font: 15px var(--sans); padding: 9px 11px; border: 1px solid var(--sand-deep); border-radius: 8px; background: #fff; }
.panel textarea { display: block; width: 100%; margin-top: 6px; font: 13.5px/1.45 ui-monospace, Menlo, Consolas, monospace; padding: 9px 11px; border: 1px solid var(--sand-deep); border-radius: 8px; background: #fff; resize: vertical; }
.panel input[type=range] { display: block; width: 100%; margin-top: 8px; accent-color: var(--accent); }
.panel label.inline { display: inline-block; margin: 0 10px 0 0; }
.panel label.inline input { display: inline-block; width: 110px; margin: 0 0 0 6px; }
.small-btn { padding: 8px 16px; font-size: 14px; cursor: pointer; }
.btn[disabled] { opacity: .55; cursor: wait; }
.small { font-size: 13.5px; }
.kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; margin-bottom: 14px; }
.kpi { background: var(--cream); border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; }
.kpi span { display: block; font-size: 12.5px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); font-weight: 600; }
.kpi strong { display: block; font-size: 24px; color: var(--navy-deep); margin-top: 2px; font-variant-numeric: tabular-nums; }
.kpi small { display: block; font-size: 12.5px; color: var(--muted); }
.kpi.best { background: var(--navy); border-color: var(--navy); }
.kpi.best span, .kpi.best small { color: #cfd9e0; }
.kpi.best strong { color: #fff; }
.verdict { font-size: 16px; margin: 0 0 12px; }
.chart { width: 100%; height: auto; display: block; font: 12px var(--sans); fill: var(--muted); }
.legend { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13.5px; margin-top: 6px; }
.legend i { display: inline-block; width: 14px; height: 4px; border-radius: 2px; vertical-align: middle; margin-right: 6px; }
.tbl, .post-body table { width: 100%; border-collapse: collapse; font: 14.5px var(--sans); margin: 8px 0 14px; }
.tbl th, .tbl td, .post-body th, .post-body td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.tbl th, .post-body th { font-size: 12.5px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); }
.table-wrap { overflow-x: auto; margin: 1.4em 0; }
.post-body .math { overflow-x: auto; margin: 1.2em 0; }
.panel ul { padding-left: 20px; font-size: 15px; }
.panel code { font: .9em ui-monospace, Menlo, Consolas, monospace; background: #efe7cf; padding: 1px 5px; border-radius: 4px; }
.bars { display: grid; gap: 10px; margin: 6px 0 12px; }
.bar { display: grid; grid-template-columns: 170px 1fr 70px; gap: 10px; align-items: center; font-size: 14px; }
.bar .track { background: var(--cream); border-radius: 6px; height: 22px; overflow: hidden; border: 1px solid var(--line); }
.bar .fill { height: 100%; border-radius: 6px 0 0 6px; }
.bar b { text-align: right; font-variant-numeric: tabular-nums; }
.graph svg, .graph .chart { width: 100%; max-width: 720px; height: auto; display: block; margin: 0 auto; font: 13px var(--sans); }

@media (max-width: 820px) {
  .demo-grid { grid-template-columns: 1fr; }
  .bar { grid-template-columns: 110px 1fr 60px; font-size: 13px; }
  .two-col, .about-head, .footer-inner { grid-template-columns: 1fr; }
  .site-footer .muted { text-align: left; }
  .wrap { padding: 0 16px; }
  .hero .hero-inner { padding: 56px 16px 64px; }
  .section { padding: 44px 16px; }
  .portrait { width: 220px; height: 220px; }
  .nav { gap: 14px; }
  .brand span { display: none; }
  .post-body { font-size: 18.5px; }
}

/* wide panels: keep charts readable */
.panel.wide .chart { max-width: 780px; }
.panel label.check { display: flex; gap: 10px; align-items: flex-start; margin: 0 0 12px; }
.panel label.check input { margin: 4px 0 0; flex: none; accent-color: var(--accent); }