/* The GTM Engineering Index — tokens + site styles (from the design style guide) */
:root{
  --ink:#16181D;
  --slate-700:#3A424C;
  --slate-500:#6B7580;
  --line:#E3E8EC;
  --surface:#F4F7F8;
  --page:#FBFCFD;
  --card:#FFFFFF;
  --primary:#0C7C64;
  --primary-bright:#0FA383;
  --primary-tint:#E6F4EF;
  --evergreen:#06231D;
  --gold:#C8892A;
  --gold-tint:#FBF1DE;
  --r-sm:8px; --r-md:12px; --r-lg:16px; --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,24,32,.05);
  --sh-2:0 8px 28px rgba(16,24,32,.08);
  --sh-3:0 20px 48px rgba(16,24,32,.10);
  --maxw:1120px; --prose:720px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;
  background:var(--page); color:var(--ink);
  line-height:1.6; -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,.display{font-family:'Space Grotesk','Inter',sans-serif;letter-spacing:-.02em;line-height:1.12}
.mono{font-family:'Space Mono',monospace}
a{color:var(--primary);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.prose{max-width:var(--prose)}
section{padding:64px 0;border-bottom:1px solid var(--line)}
.eyebrow{font-family:'Space Mono',monospace;font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--primary);font-weight:700}
.lead{font-size:19px;color:var(--slate-700);max-width:var(--prose)}
.muted{color:var(--slate-500)}
.small{font-size:14px}
.grid{display:grid;gap:24px}
.cols-2{grid-template-columns:repeat(2,1fr)}
.cols-3{grid-template-columns:repeat(3,1fr)}
@media(max-width:860px){.cols-2,.cols-3{grid-template-columns:1fr}}

/* Header */
.siteheader{background:var(--evergreen)}
.headrow{display:flex;align-items:center;justify-content:space-between;gap:24px;padding-top:18px;padding-bottom:18px;flex-wrap:wrap}
.brandmark{display:inline-flex;align-items:center;gap:10px;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:18px;color:#fff}
.brandmark:hover{text-decoration:none}
.brandmark .dot{width:12px;height:12px;border-radius:3px;background:var(--primary-bright);display:inline-block;transform:rotate(45deg);flex:none}
.mainnav{display:flex;gap:22px;flex-wrap:wrap}
.mainnav a{color:#C7D6D0;font-size:14px;font-weight:600}
.mainnav a:hover{color:#fff;text-decoration:none}

/* Masthead / page hero */
.masthead{background:var(--evergreen);color:#fff;padding:56px 0 64px;border-bottom:none}
.masthead h1{font-size:48px;margin:14px 0 16px;color:#fff}
.masthead h1 .em{color:var(--primary-bright)}
.masthead .lead{color:#C7D6D0}
.masthead a{color:var(--primary-bright)}
.updated{font-family:'Space Mono',monospace;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:#8FB3A9;margin-top:22px}
.updated a{color:#8FB3A9;text-decoration:underline}
@media(max-width:700px){.masthead h1{font-size:34px}}

/* Section headers */
.sectnum{font-family:'Space Mono',monospace;color:var(--primary);font-size:13px;font-weight:700}
h2.big{font-size:32px;margin:8px 0 12px}
h2.query{font-size:26px;margin:40px 0 10px}
@media(max-width:700px){h2.big{font-size:26px}h2.query{font-size:22px}}

/* Pills */
.pill{display:inline-flex;align-items:center;gap:6px;font-size:13px;font-weight:600;padding:5px 12px;border-radius:var(--r-pill);line-height:1.3}
.pill-primary{background:var(--primary-tint);color:var(--primary)}
.pill-gold{background:var(--gold-tint);color:var(--gold)}
.pill-ink{background:var(--surface);color:var(--slate-700)}
.pill-top{background:var(--primary);color:#fff}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;font-family:'Inter',sans-serif;font-weight:600;font-size:15px;padding:12px 22px;border-radius:var(--r-sm);cursor:pointer;border:1.5px solid transparent;transition:.15s}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-bright);text-decoration:none}
.btn-secondary{background:#fff;color:var(--primary);border-color:var(--line)}
.btn-secondary:hover{border-color:var(--primary);text-decoration:none}
.btn-sm{padding:9px 16px;font-size:14px}

/* Rank cards */
.ranklist{list-style:none;display:grid;gap:34px;margin-top:34px}
.rankcard{position:relative;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--card);padding:28px 26px 24px;box-shadow:var(--sh-1);transition:.18s}
.rankcard:hover{box-shadow:var(--sh-2);transform:translateY(-2px)}
.rankcard.featured{border:1.5px solid var(--primary);box-shadow:0 0 0 4px var(--primary-tint),var(--sh-2)}
.rankcard .rk{position:absolute;top:-14px;left:24px;width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-family:'Space Grotesk',sans-serif;font-weight:700;font-size:18px;color:#fff;background:var(--evergreen);box-shadow:var(--sh-1)}
.rankcard.featured .rk{background:var(--primary)}
.rankcard h3{font-size:22px;margin:10px 0 4px}
.rankcard h3 a{color:var(--ink)}
.rankcard .oneliner{color:var(--slate-700);font-size:15px;margin-bottom:14px}
.rankcard .whyblock,.rankcard .bestfor{font-size:15px;color:var(--slate-700);margin-top:12px}
.rankcard .row{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.badge-top{position:absolute;top:20px;right:20px}
.score{display:flex;align-items:baseline;gap:6px;font-family:'Space Grotesk',sans-serif}
.score b{font-size:30px;color:var(--ink)}
.score span{font-family:'Space Mono',monospace;font-size:12px;color:var(--slate-500)}
.taglist{display:flex;gap:6px;flex-wrap:wrap;margin-top:6px}
.meter{height:8px;border-radius:var(--r-pill);background:var(--surface);overflow:hidden;margin-top:16px}
.meter i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-bright));border-radius:inherit}

/* Table */
.tablewrap{overflow-x:auto;margin-top:24px}
table.cmp{width:100%;border-collapse:separate;border-spacing:0;background:var(--card);border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;font-size:14px}
table.cmp th,table.cmp td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
table.cmp thead th{background:var(--evergreen);color:#fff;font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:13px}
table.cmp tbody tr:last-child td{border-bottom:none}
table.cmp tbody tr.hl{background:var(--primary-tint)}
table.cmp td b{font-family:'Space Grotesk',sans-serif}
table.cmp td b a{color:var(--ink)}

/* Callouts */
.callout{border:1px solid var(--line);border-left:4px solid var(--primary);border-radius:var(--r-md);background:var(--card);padding:22px 24px}
.callout.gold{border-left-color:var(--gold)}
.callout h3.crit{font-size:16px;margin-bottom:6px;display:flex;justify-content:space-between;gap:10px;align-items:baseline}
.callout h4{font-size:16px;margin-bottom:6px}

/* FAQ */
details.faq{border:1px solid var(--line);border-radius:var(--r-md);background:var(--card);margin-bottom:12px;overflow:hidden}
details.faq summary{cursor:pointer;list-style:none;padding:18px 22px;font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:17px;display:flex;justify-content:space-between;align-items:center;gap:16px}
details.faq summary h2{font-size:17px;font-weight:600;margin:0;letter-spacing:-.01em}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";color:var(--primary);font-size:22px;font-weight:400;flex:none}
details.faq[open] summary::after{content:"–"}
details.faq .ans{padding:0 22px 20px;color:var(--slate-700);max-width:var(--prose)}

/* Glossary */
dl.glossary{display:grid;gap:18px;margin-top:26px}
dl.glossary .entry{border:1px solid var(--line);border-radius:var(--r-md);background:var(--card);padding:20px 22px}
dl.glossary dt{font-family:'Space Grotesk',sans-serif;font-weight:600;font-size:18px}
dl.glossary dd{color:var(--slate-700);margin-top:6px}

/* Detail pages */
.detailhero{background:var(--evergreen);color:#fff;padding:48px 0 56px;border-bottom:none}
.detailhero h1{font-size:38px;color:#fff;margin:14px 0 14px}
.detailhero .lead{color:#C7D6D0}
.detailhero a{color:var(--primary-bright)}
@media(max-width:700px){.detailhero h1{font-size:28px}}
.prooflist{margin:16px 0 0 20px;color:var(--slate-700)}
.prooflist li{margin:8px 0}
.stagegrid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:22px}
@media(max-width:860px){.stagegrid{grid-template-columns:1fr 1fr}}
.stage{border:1px solid var(--line);border-radius:var(--r-md);background:var(--card);padding:16px;text-align:center}
.stage b{font-family:'Space Grotesk',sans-serif;display:block}
.stage span{font-family:'Space Mono',monospace;font-size:11px;color:var(--slate-500);text-transform:uppercase;letter-spacing:.08em}

/* Breadcrumb */
.crumbs{font-size:13px;color:#8FB3A9;font-family:'Space Mono',monospace}
.crumbs a{color:#8FB3A9;text-decoration:underline}

/* Footer */
.footer{background:var(--evergreen);color:#9FBCB2;padding:48px 0 40px;font-size:13px}
.footgrid{display:grid;grid-template-columns:1.2fr 1fr;gap:40px}
@media(max-width:860px){.footgrid{grid-template-columns:1fr}}
.footbrand{margin-bottom:14px}
.disclosure{max-width:520px;line-height:1.7}
.footnav{display:grid;gap:8px;align-content:start}
.footnav a{color:#9FBCB2}
.footnav a:hover{color:#fff}
.copyline{margin-top:32px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12)}

/* 404 */
.notfound{min-height:50vh;display:flex;align-items:center}
.notfound h1{font-size:44px;margin-bottom:12px}

/* TOC on pillar */
.toc-inline{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.toc-inline a{border:1px solid var(--line);background:var(--card);border-radius:var(--r-pill);padding:7px 16px;font-size:13px;font-weight:600;color:var(--slate-700)}
.toc-inline a:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}