/* zkAGI case studies - matches zkagi.ai: obsidian navy / paper-white, Inter, Source Code Pro,
   cobalt CTAs, hairline cards, grid background. Dark is the default; html.light switches tokens
   (same localStorage key "theme" as zkagi.ai). */
:root{
  --bg:#0a192f; --surface:#112240; --surface2:#162b50; --zkbg:#010921;
  --ink:#ffffff; --cool:#ccd6f6; --muted:#9da9c9;
  --cobalt:#0052ff; --cobalt-hover:#1a63ff; --blue:#70a9ff; --indigo:#a4c8ff; --teal:#00a86b; --green:#2af698; --purple:#a992ed;
  --hair:rgba(204,214,246,.2); --hair2:rgba(204,214,246,.1);
  --card-bg:rgba(17,34,64,.7); --card-border:rgba(255,255,255,.12); --facts-bg:rgba(10,25,47,.55); --facts-border:rgba(255,255,255,.15);
  --grid:rgba(204,214,246,.06); --glow:rgba(0,82,255,.17); --code-bg:#010921; --on-tint:rgba(0,82,255,.08);
  --nav-bg:transparent; --nav-ink:#ffffff; --nav-link:#ccd6f6;
  --maxw:1152px;
  --sans:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --mono:"Source Code Pro",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  color-scheme:dark;
}
html.light{
  --bg:#f7f9fc; --surface:#ffffff; --surface2:#f0f4fa; --zkbg:#eef2f8;
  --ink:#0a192f; --cool:#1f2a44; --muted:#4a5568;
  --blue:#0052ff; --indigo:#2563eb; --green:#00a86b; --purple:#643ade;
  --hair:rgba(10,25,47,.18); --hair2:rgba(10,25,47,.09);
  --card-bg:#ffffff; --card-border:rgba(10,25,47,.12); --facts-bg:#ffffff; --facts-border:rgba(10,25,47,.14);
  --grid:rgba(10,25,47,.06); --glow:rgba(0,82,255,.10); --code-bg:#eef2f8; --on-tint:rgba(0,82,255,.06);
  --nav-bg:#0a192f; --nav-ink:#ffffff; --nav-link:#ccd6f6;
  color-scheme:light;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:linear-gradient(to right,var(--grid) 1px,transparent 1px),linear-gradient(var(--grid) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 100%);mask-image:radial-gradient(ellipse 80% 60% at 50% 0%,#000 30%,transparent 100%)}
body::after{content:"";position:fixed;inset:0;z-index:0;pointer-events:none;background:radial-gradient(600px 400px at 85% 0%,var(--glow),transparent 70%)}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{position:relative;z-index:1;max-width:var(--maxw);margin:0 auto;padding:0 16px}
@media(min-width:720px){.wrap{padding:0 24px}}
.topbar{position:fixed;left:0;top:0;height:2px;width:100%;z-index:3;background:linear-gradient(to right,var(--cobalt),#3d7bff,var(--teal))}

/* nav (stays navy in light mode, like zkagi.ai) */
.navbar{position:relative;z-index:2;background:var(--nav-bg)}
html.light .navbar{margin:0 -16px;padding:0 16px}
@media(min-width:720px){html.light .navbar{margin:0 -24px;padding:0 24px}}
.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 0;border-bottom:1px solid var(--hair2)}
html.light .nav{border-bottom-color:rgba(204,214,246,.15)}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:700;font-size:18px;letter-spacing:-.01em;color:var(--nav-ink)}
.brand img{width:28px;height:28px;display:block}
.brand b{color:#70a9ff;font-weight:700}
.nav .links{display:flex;gap:18px;font-size:14px;align-items:center}
.nav .links a{color:var(--nav-link)}
.nav .links a.hide-s{display:none}
@media(min-width:900px){.nav .links a.hide-s{display:inline}}
.nav .links a:hover{color:#fff;text-decoration:none}
.nav .links a.cta{background:var(--cobalt);color:#fff;font-weight:600;padding:8px 16px;border-radius:6px}
.nav .links a.cta:hover{background:var(--cobalt-hover)}
.theme{appearance:none;background:transparent;border:1px solid rgba(204,214,246,.3);color:var(--nav-ink);width:34px;height:34px;border-radius:8px;cursor:pointer;display:inline-flex;align-items:center;justify-content:center;padding:0}
.theme:hover{border-color:#70a9ff}
.theme svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.theme .sun{display:none}
html.light .theme .sun{display:block}
html.light .theme .moon{display:none}

/* hero */
.hero{padding:64px 0 24px}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--blue);margin:0 0 18px}
.eyebrow .dot{color:var(--muted)}
h1{font-weight:700;letter-spacing:-.025em;line-height:1.1;font-size:clamp(32px,5vw,56px);margin:0 0 18px;color:var(--ink);text-wrap:balance}
h1 em{font-style:normal;color:var(--blue)}
.sub{font-size:clamp(16px,1.6vw,18px);color:var(--muted);max-width:720px;margin:0;line-height:1.65}
.sub b{color:var(--ink);font-weight:600}

/* facts strip (receipt-card look) */
.facts{display:grid;grid-template-columns:repeat(2,1fr);gap:0;margin:36px 0 0;padding:6px;border:1px solid var(--facts-border);border-radius:16px;background:var(--facts-bg);font-family:var(--mono)}
@media(min-width:720px){.facts{grid-template-columns:repeat(3,1fr)}}
@media(min-width:960px){.facts{grid-template-columns:repeat(6,1fr)}}
.facts div{padding:12px 14px;border-right:1px solid var(--hair2)}
.facts div:last-child{border-right:0}
@media(max-width:959px){.facts div{border-right:0;border-bottom:1px solid var(--hair2)}}
.facts dt{font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:0 0 6px}
.facts dd{margin:0;font-size:13px;color:var(--ink)}
.facts dd.mono{color:var(--green)}

/* sections */
section{padding:44px 0 4px}
h2{font-weight:700;letter-spacing:-.02em;font-size:clamp(22px,2.6vw,30px);line-height:1.15;color:var(--ink);margin:0 0 16px;text-wrap:balance}
h2::before{content:"";display:block;width:36px;height:3px;border-radius:2px;background:linear-gradient(to right,var(--cobalt),var(--teal));margin-bottom:14px}
h3{font-weight:600;font-size:16px;letter-spacing:-.01em;margin:22px 0 8px;color:var(--ink)}
p{margin:0 0 14px;max-width:760px;color:var(--cool)}
ul{margin:0 0 14px;padding-left:20px;max-width:760px;color:var(--cool)}
li{margin:0 0 8px}
li::marker{color:var(--blue)}
li b{color:var(--ink);font-weight:600}
.lede{font-size:18px;color:var(--ink)}
.muted{color:var(--muted)}
.quote{border-left:3px solid var(--cobalt);padding:10px 20px;margin:20px 0;color:var(--ink);font-size:18px;line-height:1.55;max-width:760px;background:linear-gradient(90deg,var(--on-tint),transparent);border-radius:0 12px 12px 0}
.quote small{display:block;margin-top:10px;color:var(--muted);font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase}

/* cards */
.grid{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:720px){.grid.c2{grid-template-columns:1fr 1fr}.grid.c3{grid-template-columns:repeat(3,1fr)}}
.card{position:relative;background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:20px 20px 14px}
.card h4{margin:0 0 10px;font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:500}
.card p,.card ul{font-size:14px;margin-bottom:8px;color:var(--cool)}
.card .big{font-size:30px;font-weight:700;letter-spacing:-.02em;color:var(--ink);margin:0 0 6px;font-family:var(--sans)}
.card .big em{font-style:normal;color:var(--blue)}
.card.hot{border-color:var(--blue);box-shadow:0 0 0 1px rgba(0,82,255,.2) inset}
.card.hot .big em{color:var(--green)}

/* FDE process */
.pipe{display:grid;gap:10px;grid-template-columns:1fr;counter-reset:step}
@media(min-width:720px){.pipe{grid-template-columns:repeat(3,1fr)}}
@media(min-width:960px){.pipe{grid-template-columns:repeat(6,1fr)}}
.pipe div{position:relative;background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:14px 14px 12px;min-height:120px}
.pipe div::before{counter-increment:step;content:"0" counter(step);display:block;font-family:var(--mono);font-size:11px;color:var(--blue);letter-spacing:.16em;margin-bottom:8px}
.pipe b{display:block;font-weight:600;font-size:14px;color:var(--ink);margin-bottom:6px}
.pipe span{font-size:13px;color:var(--muted);display:block;line-height:1.5}

/* lanes table */
table{width:100%;border-collapse:separate;border-spacing:0;font-size:14px;margin:0 0 16px;border:1px solid var(--card-border);border-radius:12px;overflow:hidden;background:var(--card-bg)}
th{text-align:left;font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:500;padding:10px 12px;border-bottom:1px solid var(--hair2)}
td{padding:11px 12px;border-bottom:1px solid var(--hair2);vertical-align:top;color:var(--muted)}
tr:last-child td{border-bottom:0}
td.mono{font-family:var(--mono);color:var(--cool);font-size:13px;white-space:nowrap}
tr.on td{color:var(--cool);background:var(--on-tint)}
tr.on td.mono{color:var(--green)}
.tag{display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.06em;padding:5px 10px;border:1px solid var(--hair);border-radius:999px;color:var(--cool);margin:0 6px 6px 0;background:var(--card-bg)}
.tag.gold{border-color:var(--cobalt);background:var(--cobalt);color:#fff}
.tag.violet{border-color:var(--purple);color:var(--purple)}
.tag.hot{border-color:var(--green);color:var(--green)}
.links{max-width:none}
.links .tag:hover{text-decoration:none;border-color:var(--blue);color:var(--ink)}
.links .tag.gold:hover{color:#fff;background:var(--cobalt-hover)}

/* code */
pre{background:var(--code-bg);border:1px solid var(--hair2);border-radius:12px;padding:14px 16px;overflow:auto;font-family:var(--mono);font-size:12.5px;line-height:1.5;color:var(--cool);max-width:760px;margin:0 0 16px}
code{font-family:var(--mono);font-size:.92em;color:var(--indigo)}

/* figure */
figure{margin:18px 0 24px;max-width:420px}
figure img{width:100%;display:block;border:1px solid var(--card-border);border-radius:16px}
figcaption{font-size:12px;color:var(--muted);margin-top:8px}

/* index cards */
.cs-list{display:grid;gap:14px;grid-template-columns:1fr;margin-top:8px}
@media(min-width:720px){.cs-list{grid-template-columns:1fr 1fr}}
.cs{display:block;color:inherit;background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:22px 22px 18px;transition:border-color .15s,transform .15s}
.cs:hover{border-color:var(--blue);text-decoration:none;transform:translateY(-2px)}
.cs .region{font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue)}
.cs h3{margin:10px 0 6px;font-size:20px;font-weight:700;letter-spacing:-.02em;color:var(--ink)}
.cs p{font-size:14px;color:var(--muted);margin:0 0 12px}
.cs .cta{font-size:13px;font-weight:600;color:var(--ink)}

/* partner map cards */
.map{display:grid;gap:10px;grid-template-columns:1fr}
@media(min-width:720px){.map{grid-template-columns:repeat(2,1fr)}}
@media(min-width:960px){.map{grid-template-columns:repeat(4,1fr)}}
.map div{background:var(--card-bg);border:1px solid var(--card-border);border-radius:12px;padding:14px}
.map b{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--blue);font-weight:500;margin-bottom:8px}
.map span{display:block;font-size:14px;color:var(--ink);margin-bottom:4px;font-weight:600}
.map small{display:block;color:var(--muted);font-size:12.5px;line-height:1.5}

/* world map */
.worldwrap{position:relative;border:1px solid var(--card-border);border-radius:16px;background:var(--facts-bg);padding:8px;margin:0 0 18px;overflow:hidden}
.worldwrap svg{width:100%;height:auto;display:block}
.world-sphere{fill:var(--code-bg);stroke:var(--hair)}
.world-land{fill:var(--surface2);stroke:var(--blue);stroke-opacity:.45;stroke-width:.6}
.pin-core{stroke:var(--bg);stroke-width:1.5}
.legend{display:flex;flex-wrap:wrap;gap:16px;font-family:var(--mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:6px 8px 4px}
.legend i{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:8px;vertical-align:-1px}
.pin-tip{position:absolute;pointer-events:none;background:var(--surface);border:1px solid var(--hair);border-radius:8px;padding:8px 10px;font-size:12px;color:var(--ink);max-width:240px;display:none;z-index:2;box-shadow:0 8px 24px rgba(0,0,0,.25)}
.pin-tip b{display:block;font-size:13px}
.pin-tip span{color:var(--muted)}

/* cta */
.ctaBox{margin:52px 0 24px;padding:32px 28px;border:1px solid var(--facts-border);border-radius:16px;background:linear-gradient(135deg,rgba(0,82,255,.16),var(--card-bg) 60%)}
.ctaBox h2::before{display:none}
.btn{display:inline-flex;align-items:center;gap:8px;margin:8px 10px 4px 0;padding:11px 20px;border-radius:6px;background:var(--cobalt);color:#fff;font-size:14px;font-weight:600;letter-spacing:.02em}
.btn:hover{text-decoration:none;background:var(--cobalt-hover)}
.btn.sec{background:transparent;border:1px solid var(--hair);color:var(--ink)}
.btn.sec:hover{border-color:var(--blue)}
footer{padding:28px 0 44px;border-top:1px solid var(--hair2);font-size:13px;color:var(--muted);display:flex;flex-wrap:wrap;gap:14px 24px;justify-content:space-between}
footer a{color:var(--cool)}
footer .fl{display:flex;flex-wrap:wrap;gap:14px}
.note{font-size:13px;color:var(--muted);border:1px dashed var(--hair);border-radius:10px;padding:10px 14px;max-width:760px;margin:0 0 16px}
.pill{display:inline-flex;align-items:center;gap:6px;font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--green);border:1px solid var(--green);border-radius:999px;padding:4px 10px}

/* logos */
.logorow{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin:0 0 18px}
.logorow .x{color:var(--muted);font-size:14px}
.logo{display:inline-flex;align-items:center;gap:8px;background:#fff;color:#0a192f;border:1px solid rgba(10,25,47,.12);border-radius:8px;padding:6px 12px;font-size:14px;line-height:1;white-space:nowrap;font-family:var(--sans)}
.logo img,.logo svg{display:block;width:auto}
.logo .word{font-weight:700;letter-spacing:-.01em}
.logo.big{padding:12px 18px;font-size:16px;min-height:52px}
.logo.big img,.logo.big svg{transform:scale(1.25);transform-origin:left center;margin-right:6px}
.wall{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.cs .logorow{margin:10px 0 2px}
.cs .logo{padding:5px 10px;font-size:13px}

/* visuals */
.shots{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:720px){.shots{grid-template-columns:1fr 1fr}}
.shot{margin:0;max-width:none;background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;padding:8px}
.shot img{width:100%;height:auto;display:block;border-radius:10px;border:1px solid var(--hair2)}
.shot figcaption{font-size:12.5px;color:var(--muted);padding:8px 6px 2px}

/* v3: plain-language layout */
.facts{grid-template-columns:repeat(auto-fit,minmax(170px,1fr)) !important}
.facts dd{color:var(--ink)}
.vid{padding-top:28px}
.vid video{width:100%;max-width:960px;display:block;border-radius:16px;border:1px solid var(--card-border);background:#000;aspect-ratio:16/9}
.vid p{margin-top:8px;font-size:13px}
.duo{display:grid;gap:14px;grid-template-columns:1fr}
@media(min-width:720px){.duo{grid-template-columns:1fr 1fr}}
.duo ul{margin:0;padding-left:18px}
.duo li{font-size:16px;color:var(--ink)}
@media(min-width:960px){.grid.c4{grid-template-columns:repeat(4,1fr)}}
@media(min-width:720px) and (max-width:959px){.grid.c4{grid-template-columns:1fr 1fr}}
.card p:last-child{margin-bottom:0}
ul.only{list-style:none;padding:0}
ul.only li{position:relative;padding-left:30px;font-size:18px;color:var(--ink);margin-bottom:12px}
ul.only li::before{content:"";position:absolute;left:0;top:6px;width:18px;height:18px;border-radius:50%;background:var(--cobalt);
  -webkit-mask:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Ccircle cx='12' cy='12' r='12'/%3E%3C/svg%3E")}
ul.only li::after{content:"";position:absolute;left:6px;top:9px;width:5px;height:9px;border:solid #fff;border-width:0 2px 2px 0;transform:rotate(45deg)}
details.tech{margin:36px 0 0;border:1px solid var(--card-border);border-radius:12px;padding:12px 16px;background:var(--card-bg);max-width:760px}
details.tech summary{cursor:pointer;font-family:var(--mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
details.tech ul{margin:12px 0 4px}
details.tech li{font-size:14px;color:var(--muted)}
.cs .thumb{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:10px;margin:0 0 12px;border:1px solid var(--hair2);display:block}
.cs .play{display:inline-block;margin-left:8px;font-family:var(--mono);font-size:11px;color:var(--blue)}