/* COGNILANG — site stylesheet
   Palette: ink navy / blue-paper / project blue / signal cyan
   Code families: LIN blue · DIS violet · TRA amber · PRD teal */

:root{
  --ink:#16294F;
  --ink-soft:#3A4E78;
  --paper:#F2F5FA;
  --card:#FFFFFF;
  --line:#D6DEEC;
  --blue:#2E75B6;
  --cyan:#00A8CC;
  --lin:#2E75B6;
  --dis:#6D4DD4;
  --tra:#B96500;
  --prd:#0E8A6D;
  --max:1100px;
  --radius:12px;
  --shadow:0 4px 18px rgba(22,41,79,.08);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Source Sans 3",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:17px;line-height:1.65;
  color:var(--ink);
  background:linear-gradient(165deg,#0B1F4B 0%,#16294F 45%,#1D3A6E 100%) fixed;
}
main>section{background:var(--paper)}
main>section.hero{background:transparent}
img{max-width:100%}
a{color:var(--blue)}
a:hover{color:var(--cyan)}

h1,h2,h3{font-family:"Fraunces",Georgia,serif;line-height:1.18;color:var(--ink);margin:0 0 .5em}
h1{font-size:clamp(2.1rem,4.6vw,3.4rem);font-weight:600;letter-spacing:-.01em}
h2{font-size:clamp(1.5rem,2.8vw,2.1rem);font-weight:600}
h3{font-size:1.18rem;font-weight:600}
/* Section titles cycle through the code-family palette */
main>section:nth-of-type(4n+2) h2{color:var(--blue)}
main>section:nth-of-type(4n+3) h2{color:var(--dis)}
main>section:nth-of-type(4n+4) h2{color:var(--prd)}
main>section:nth-of-type(4n+5) h2{color:var(--tra)}
main>section:nth-of-type(4n+2) .eyebrow{color:var(--blue)}
main>section:nth-of-type(4n+3) .eyebrow{color:var(--dis)}
main>section:nth-of-type(4n+4) .eyebrow{color:var(--prd)}
main>section:nth-of-type(4n+5) .eyebrow{color:var(--tra)}
p{margin:.4em 0 1em}
.small{font-size:.92rem;color:var(--ink-soft)}

.mono,.chip,.eyebrow{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace}
.eyebrow{
  display:inline-block;font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--blue);margin-bottom:.7rem;
}
.eyebrow::before{content:"// "}

.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
section{padding:60px 0}
section.alt{background:var(--card);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}

/* ── Nav ─────────────────────────────────────────── */
header.site{
  position:sticky;top:0;z-index:50;
  background:rgba(242,245,250,.92);backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;max-width:var(--max);margin:0 auto;padding:12px 22px}
.brand{display:flex;align-items:baseline;gap:10px;text-decoration:none;color:var(--ink);margin-right:auto}
.brand b{font-family:"Fraunces",serif;font-size:1.25rem;letter-spacing:.02em}
.brand span{font-family:"IBM Plex Mono",monospace;font-size:.72rem;color:var(--ink-soft)}
nav.tabs{display:flex;gap:4px;flex-wrap:wrap}
nav.tabs a{
  text-decoration:none;color:var(--ink-soft);font-weight:600;font-size:.93rem;
  padding:8px 12px;border-radius:8px;
}
nav.tabs a:hover{background:#E6EDF8;color:var(--ink)}
nav.tabs a.active{background:var(--ink);color:#fff}
#navToggle{display:none;background:none;border:1px solid var(--line);border-radius:8px;
  padding:6px 10px;font-size:1.05rem;color:var(--ink);cursor:pointer}

/* ── Tri-script alignment band (signature) ───────── */
.triptych{
  display:grid;grid-template-columns:1fr;gap:0;
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:var(--card);box-shadow:var(--shadow);
}
.tript-row{
  display:grid;grid-template-columns:64px 1fr auto;align-items:center;gap:14px;
  padding:14px 18px;border-bottom:1px dashed var(--line);position:relative;
}
.tript-row:last-child{border-bottom:none}
.tript-lang{font-family:"IBM Plex Mono",monospace;font-size:.78rem;color:var(--ink-soft);
  border:1px solid var(--line);border-radius:6px;text-align:center;padding:3px 0}
.tript-text{font-size:1.04rem}
.tript-text[dir="rtl"]{font-family:"Noto Naskh Arabic","Source Sans 3",serif;font-size:1.18rem;text-align:right}
.tript-row::before{
  content:"";position:absolute;left:31px;top:100%;width:2px;height:15px;background:var(--cyan);
}
.tript-row:last-child::before{display:none}
.reveal .tript-row{opacity:0;transform:translateY(8px);animation:rise .6s ease forwards}
.reveal .tript-row:nth-child(2){animation-delay:.18s}
.reveal .tript-row:nth-child(3){animation-delay:.36s}
@keyframes rise{to{opacity:1;transform:none}}
@media (prefers-reduced-motion:reduce){
  .reveal .tript-row{animation:none;opacity:1;transform:none}
}

/* ── Annotation chips ─────────────────────────────── */
.chip{
  display:inline-block;font-size:.74rem;font-weight:600;letter-spacing:.04em;
  padding:2px 9px;border-radius:999px;color:#fff;vertical-align:middle;
}
.chip.lin{background:var(--lin)}
.chip.dis{background:var(--dis)}
.chip.tra{background:var(--tra)}
.chip.prd{background:var(--prd)}
.chip.h{background:var(--ink)}

/* ── Hero (on navy, with multi-script letters backdrop) ── */
.hero{padding:72px 0 60px;position:relative;color:#EAF1FC}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:url("/assets/letters.svg") right -40px top -20px / 640px auto no-repeat;
  opacity:.5;
}
.hero .wrap{position:relative}
.hero h1{color:#FFFFFF}
.hero .lede{font-size:1.18rem;max-width:46rem;color:#C9D9F4}
.hero .eyebrow{color:#7FDBFF}
.hero a{color:#9FD3FF}
.hero a:hover{color:#FFFFFF}
.hero .small{color:#A9BEE3}
.hero .btn.primary{background:#00A8CC;border-color:#00A8CC;color:#062038}
.hero .btn.primary:hover{background:#7FDBFF;border-color:#7FDBFF;color:#062038}
.hero .btn.ghost{color:#EAF1FC;border-color:#7FDBFF}
.hero .btn.ghost:hover{background:rgba(127,219,255,.16);color:#FFFFFF}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.cta-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:1.4rem}
.btn{
  display:inline-block;text-decoration:none;font-weight:700;font-size:.97rem;
  padding:12px 20px;border-radius:10px;border:2px solid var(--ink);
}
.btn.primary{background:var(--ink);color:#fff}
.btn.primary:hover{background:var(--blue);border-color:var(--blue);color:#fff}
.btn.ghost{color:var(--ink);background:transparent}
.btn.ghost:hover{background:#E6EDF8;color:var(--ink)}

/* ── Cards & grids ───────────────────────────────── */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 24px;box-shadow:var(--shadow);
}
.card h3{margin-top:0}
.card .chip{margin-bottom:.6rem}

/* ── Tables ──────────────────────────────────────── */
table{width:100%;border-collapse:collapse;background:var(--card);
  border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;font-size:.95rem}
caption{caption-side:top;text-align:left;font-weight:700;padding:0 0 .5rem;
  font-family:"Fraunces",serif;font-size:1.05rem}
th{background:var(--ink);color:#fff;text-align:left;padding:10px 14px;font-weight:600}
td{padding:10px 14px;border-top:1px solid var(--line);vertical-align:top}
tbody tr:nth-child(even){background:#F7FAFE}
td .mono{font-size:.84rem}

/* ── Steps (real sequences only) ─────────────────── */
ol.steps{counter-reset:s;list-style:none;margin:0;padding:0}
ol.steps>li{
  counter-increment:s;position:relative;padding:0 0 26px 64px;
}
ol.steps>li::before{
  content:counter(s,decimal-leading-zero);
  position:absolute;left:0;top:0;width:44px;height:44px;border-radius:10px;
  background:var(--ink);color:#fff;font-family:"IBM Plex Mono",monospace;font-size:.95rem;
  display:flex;align-items:center;justify-content:center;
}
ol.steps>li::after{
  content:"";position:absolute;left:21px;top:48px;bottom:6px;width:2px;background:var(--line);
}
ol.steps>li:last-child::after{display:none}
ol.steps h3{margin-bottom:.25rem}

/* ── Callout ─────────────────────────────────────── */
.callout{
  border-left:5px solid var(--cyan);background:var(--card);
  border-radius:0 var(--radius) var(--radius) 0;padding:16px 20px;margin:1.2rem 0;
  box-shadow:var(--shadow);
}
.callout b:first-child{color:var(--ink)}

/* ── Forms ───────────────────────────────────────── */
form.join{display:grid;gap:16px;max-width:680px}
form.join label{font-weight:700;font-size:.95rem;display:block;margin-bottom:6px}
form.join input,form.join select,form.join textarea{
  width:100%;padding:11px 13px;border:1px solid var(--line);border-radius:9px;
  font:inherit;background:#fff;color:var(--ink);
}
form.join input:focus,form.join select:focus,form.join textarea:focus{
  outline:2px solid var(--cyan);outline-offset:1px;border-color:var(--cyan);
}
.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
#formStatus{font-weight:700}
#formStatus.ok{color:var(--prd)}
#formStatus.err{color:#B3261E}

/* ── Footer ──────────────────────────────────────── */
footer.site{background:var(--ink);color:#C9D6EE;margin-top:60px}
footer.site .wrap{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;padding:44px 22px}
footer.site h4{color:#fff;font-family:"Fraunces",serif;margin:0 0 .6rem}
footer.site a{color:#9FD3FF;text-decoration:none}
footer.site a:hover{color:#fff}
footer.site ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.footline{border-top:1px solid #2A3F6E;padding:14px 22px;font-size:.85rem;color:#8FA3CC;
  max-width:var(--max);margin:0 auto}

/* focus visibility */
a:focus-visible,button:focus-visible{outline:3px solid var(--cyan);outline-offset:2px;border-radius:6px}

/* ── Responsive ──────────────────────────────────── */
@media (max-width:900px){
  .hero-grid,.grid3,.grid2{grid-template-columns:1fr}
  footer.site .wrap{grid-template-columns:1fr}
  #navToggle{display:block}
  nav.tabs{
    display:none;position:absolute;top:100%;left:0;right:0;
    background:var(--card);border-bottom:1px solid var(--line);
    flex-direction:column;padding:10px 18px 16px;
  }
  nav.tabs.open{display:flex}
}