/* =========================================================
   Celerko — design tokens
   Bloomberg terminal that went to design school and learned to make jokes
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600;700&family=Inter:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --bg: #F6F7F4;
  --bg-panel: #FFFFFF;
  --bg-alt: #EDEFEA;
  --ink: #0E1A2B;
  --ink-soft: #56636F;
  --ink-faint: #8A9199;
  --line: #DADFD8;
  --line-strong: #C3C9C2;
  --accent: #15C46D;
  --accent-dark: #0C9A54;
  --accent-wash: #E4F8ED;
  --danger: #D65B4A;

  --font-head: 'Space Grotesk', 'Arial', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'IBM Plex Mono', 'SFMono-Regular', Menlo, monospace;

  --max: 1180px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 3px;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
@media(prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

h1,h2,h3,h4{
  font-family:var(--font-head);
  font-weight:600;
  line-height:1.15;
  margin:0 0 0.5em;
  letter-spacing:-0.01em;
}
h1{font-size:clamp(2.3rem, 4.4vw, 3.6rem); font-weight:700;}
h2{font-size:clamp(1.7rem, 3vw, 2.35rem);}
h3{font-size:1.2rem;}
p{margin:0 0 1em; max-width:62ch;}
a{color:inherit;}
img,svg{display:block; max-width:100%;}

.mono{font-family:var(--font-mono);}

.container{
  max-width:var(--max);
  margin:0 auto;
  padding-left:var(--pad);
  padding-right:var(--pad);
}

.section{
  padding:88px 0;
  position:relative;
  border-bottom:1px solid var(--line);
}
.section:last-of-type{border-bottom:none;}

.eyebrow-plain{
  font-family:var(--font-mono);
  font-size:0.8rem;
  color:var(--ink-faint);
  margin-bottom:14px;
}

.lede{
  font-size:1.15rem;
  color:var(--ink-soft);
  max-width:52ch;
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-body);
  font-weight:600;
  font-size:0.96rem;
  padding:13px 22px;
  border-radius:var(--radius);
  border:1px solid transparent;
  cursor:pointer;
  text-decoration:none;
  transition:transform .15s ease, background .15s ease, border-color .15s ease;
}
.btn:active{transform:translateY(1px);}
.btn-primary{
  background:var(--ink);
  color:#fff;
}
.btn-primary:hover{background:#1B2C44;}
.btn-ghost{
  background:transparent;
  color:var(--ink);
  border-color:var(--line-strong);
}
.btn-ghost:hover{border-color:var(--ink); background:var(--bg-alt);}
.btn-accent{
  background:var(--accent);
  color:#04241490;
  color:#08331B;
}
.btn-accent:hover{background:var(--accent-dark); color:#fff;}
:focus-visible{outline:2px solid var(--accent-dark); outline-offset:2px;}

/* ---------- nav ---------- */
.nav{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(246,247,244,0.88);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.nav-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-top:16px;
  padding-bottom:16px;
}
.nav-links{
  display:flex;
  gap:32px;
  list-style:none;
  margin:0; padding:0;
  font-size:0.95rem;
  font-weight:500;
}
.nav-links a{
  text-decoration:none;
  color:var(--ink-soft);
  padding-bottom:2px;
  border-bottom:1px solid transparent;
  transition:color .15s ease, border-color .15s ease;
}
.nav-links a:hover, .nav-links a.active{color:var(--ink); border-color:var(--accent);}
.nav-cta{display:flex; align-items:center; gap:22px;}
.nav-tag{
  display:none;
}
.logo-link{display:flex; align-items:center;}
.nav-toggle{display:none;}
.nav-cta .btn-primary span.short{display:none;}

@media (max-width: 820px){
  .nav-links{
    position:fixed; inset:64px 0 0 0; background:var(--bg);
    flex-direction:column; padding:28px var(--pad); gap:22px;
    font-size:1.1rem; transform:translateY(-8px); opacity:0;
    pointer-events:none; transition:opacity .18s ease, transform .18s ease;
  }
  .nav-links.open{opacity:1; transform:translateY(0); pointer-events:auto;}
  .nav-toggle{
    display:flex; align-items:center; justify-content:center;
    width:38px; height:38px; border:1px solid var(--line-strong); border-radius:var(--radius);
    background:transparent; cursor:pointer;
  }
  .nav-toggle span{display:block; width:16px; height:1.4px; background:var(--ink); position:relative;}
  .nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:16px;height:1.4px;background:var(--ink);}
  .nav-toggle span::before{top:-5px;} .nav-toggle span::after{top:5px;}
  .nav-cta .btn-primary span.long{display:none;}
}

/* ---------- footer ---------- */
.footer{
  padding:56px 0 40px;
  border-top:1px solid var(--line);
}
.footer-top{
  display:flex; justify-content:space-between; align-items:flex-start;
  flex-wrap:wrap; gap:28px;
  padding-bottom:32px; margin-bottom:24px;
  border-bottom:1px solid var(--line);
}
.footer-tagline{font-family:var(--font-head); font-size:1.15rem; margin:14px 0 4px;}
.footer-sub{color:var(--ink-faint); font-size:0.92rem; font-family:var(--font-mono);}
.footer-links{display:flex; gap:40px; flex-wrap:wrap;}
.footer-col h4{
  font-family:var(--font-mono); font-size:0.78rem; text-transform:uppercase;
  letter-spacing:0.06em; color:var(--ink-faint); font-weight:500; margin-bottom:10px;
}
.footer-col ul{list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:8px;}
.footer-col a{text-decoration:none; color:var(--ink-soft); font-size:0.94rem;}
.footer-col a:hover{color:var(--ink);}
.footer-bottom{display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; color:var(--ink-faint); font-size:0.85rem;}

/* ========================================================
   Recurring visual system
   ======================================================== */

/* blueprint grid texture */
.grid-texture{
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:48px 48px;
  opacity:0.5;
  mask-image:linear-gradient(to bottom, black, transparent 85%);
  pointer-events:none;
}

/* panel — the base "instrument" surface */
.panel{
  background:var(--bg-panel);
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
}
.panel-head{
  display:flex; justify-content:space-between; align-items:center;
  flex-wrap:wrap; gap:6px 14px;
  padding:10px 16px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:0.75rem;
  letter-spacing:0.04em;
  color:var(--ink-faint);
}
.panel-dots{display:flex; gap:5px;}
.panel-dots span{width:7px; height:7px; border-radius:50%; background:var(--line-strong);}

/* status bars */
.stat-row{
  display:grid;
  grid-template-columns:64px 1fr 48px;
  align-items:center;
  gap:12px;
  font-family:var(--font-mono);
  font-size:0.82rem;
  padding:7px 0;
}
.stat-label{color:var(--ink-soft);}
.stat-track{
  height:7px; background:var(--bg-alt); border-radius:2px; overflow:hidden;
  border:1px solid var(--line);
}
.stat-fill{
  height:100%; background:linear-gradient(90deg, var(--accent-dark), var(--accent));
  width:0%;
  transition:width 1.4s cubic-bezier(.2,.8,.2,1);
}
.stat-val{text-align:right; color:var(--ink);}

.telemetry-row{
  display:flex; justify-content:space-between;
  font-family:var(--font-mono); font-size:0.8rem;
  padding:6px 0; color:var(--ink-soft);
  border-top:1px dashed var(--line);
}
.telemetry-row:first-child{border-top:none;}
.telemetry-row .val{color:var(--ink); font-weight:500;}
.telemetry-row .val.up::after{content:" ▲"; color:var(--accent-dark); font-size:0.7em;}
.telemetry-row .val.down::after{content:" ▼"; color:var(--ink-faint); font-size:0.7em;}

.status-line{
  font-family:var(--font-mono); font-size:0.82rem; color:var(--ink-soft);
  padding-top:10px; margin-top:6px; border-top:1px solid var(--line);
  display:flex; justify-content:space-between;
}
.status-line .badge{
  color:var(--accent-dark); font-weight:600;
}
.status-line .badge::before{content:"● "; }

/* heatmap texture (GPU cores) */
.heatmap{display:grid; grid-template-columns:repeat(16,1fr); gap:3px;}
.heatmap span{
  aspect-ratio:1; border-radius:1px; background:var(--bg-alt);
}

/* packet stream lines */
.packet-lane{
  position:relative; height:2px; background:var(--line); margin:22px 0; overflow:visible;
}
.packet-lane .dot{
  position:absolute; top:50%; width:6px; height:6px; margin-top:-3px;
  border-radius:50%; background:var(--accent); box-shadow:0 0 0 3px var(--accent-wash);
  animation:travel linear infinite;
}
@keyframes travel{
  from{left:-2%;}
  to{left:102%;}
}

/* faint background chart texture behind headings */
.chart-veil{
  position:absolute; left:0; right:0; bottom:-10px; height:120px;
  opacity:0.55; pointer-events:none;
}

/* section heading with background chart texture */
.veil-heading{position:relative; padding-top:6px;}
.veil-heading h2{position:relative; z-index:1;}

/* two-col layout */
.split{
  display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:center;
}
@media(max-width:860px){ .split{grid-template-columns:1fr; gap:36px;} }
.split-hero{grid-template-columns:1.05fr 0.95fr;}
@media(max-width:860px){ .split-hero{grid-template-columns:1fr;} }
.split.reverse .split-visual{order:-1;}
@media(max-width:860px){ .split.reverse .split-visual{order:0;} }

/* pill toggle group */
.pill-group{display:flex; gap:8px; flex-wrap:wrap;}
.pill{
  font-family:var(--font-mono); font-size:0.82rem;
  padding:9px 16px; border:1px solid var(--line-strong); border-radius:20px;
  background:var(--bg-panel); cursor:pointer; color:var(--ink-soft);
  transition:all .15s ease;
}
.pill.selected, .pill:hover{border-color:var(--ink); color:var(--ink);}
.pill.selected{background:var(--accent-wash); border-color:var(--accent-dark); color:var(--ink);}

/* range input */
input[type="range"]{
  -webkit-appearance:none; width:100%; height:4px; background:var(--line-strong);
  border-radius:2px; outline:none;
}
input[type="range"]::-webkit-slider-thumb{
  -webkit-appearance:none; width:16px; height:16px; border-radius:50%;
  background:var(--accent); border:2px solid var(--ink); cursor:pointer; margin-top:-1px;
}
input[type="range"]::-moz-range-thumb{
  width:14px; height:14px; border-radius:50%; background:var(--accent); border:2px solid var(--ink); cursor:pointer;
}

/* form fields */
.field{margin-bottom:20px;}
.field label{
  display:block; font-family:var(--font-mono); font-size:0.8rem; color:var(--ink-soft);
  margin-bottom:7px;
}
.field input[type="text"], .field input[type="email"], .field textarea, .field select{
  width:100%; padding:12px 14px; font-family:var(--font-body); font-size:0.98rem;
  border:1px solid var(--line-strong); border-radius:var(--radius); background:var(--bg-panel);
  color:var(--ink);
}
.field textarea{resize:vertical; min-height:110px;}
.field input:focus, .field textarea:focus, .field select:focus{border-color:var(--ink);}
.field ::placeholder{color:var(--ink-faint);}

/* utility */
.tag{
  display:inline-block; font-family:var(--font-mono); font-size:0.78rem;
  color:var(--ink-faint); border:1px solid var(--line); border-radius:20px;
  padding:4px 10px; margin-bottom:16px;
}
.small{font-size:0.88rem; color:var(--ink-faint);}
.center{text-align:center;}
.mt-lg{margin-top:56px;}
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:28px;}
@media(max-width:820px){.grid-3{grid-template-columns:1fr;}}

/* ---------- page header (secondary pages) ---------- */
.page-header{
  position:relative;
  overflow:hidden;
  background:
    radial-gradient(ellipse 640px 420px at 88% -10%, var(--accent-wash) 0%, transparent 65%),
    var(--bg);
}
.page-header .container{position:relative; z-index:2;}
.hero-bg{
  position:absolute; inset:0; z-index:1;
  opacity:0.55;
  pointer-events:none;
}
@media(prefers-reduced-motion: reduce){
  .hero-bg [data-pulse]{animation:none !important;}
}
.hero-bg [data-pulse]{animation:pulse-dot 3.4s ease-in-out infinite;}
@keyframes pulse-dot{
  0%,100%{opacity:0.35;}
  50%{opacity:0.9;}
}

/* ---------- formula diagram (CSS-based, replaces hand-plotted SVG) ---------- */
.formula{
  display:flex; flex-direction:column; align-items:center; gap:0;
  max-width:640px; margin:0 auto;
}
.formula-inputs{
  display:flex; align-items:center; justify-content:center;
  gap:10px; flex-wrap:wrap;
}
.formula-chip{
  font-family:var(--font-mono); font-size:0.85rem;
  border:1px solid var(--line-strong); border-radius:20px;
  padding:9px 18px; background:var(--bg-panel); color:var(--ink-soft);
}
.formula-plus{color:var(--ink-faint); font-size:0.9rem;}
.formula-arrow{
  width:1px; height:34px; background:var(--line-strong);
  position:relative; margin:6px 0;
}
.formula-arrow::after{
  content:""; position:absolute; left:50%; bottom:0; transform:translateX(-50%);
  border-left:5px solid transparent; border-right:5px solid transparent;
  border-top:6px solid var(--line-strong);
}
.formula-box{
  border:1px solid var(--line-strong); border-radius:var(--radius);
  background:var(--bg-panel); padding:14px 28px;
  font-family:var(--font-mono); font-size:0.9rem; color:var(--ink);
  text-align:center;
}
.formula-box.result{border-color:var(--ink); font-weight:600;}
.formula-box.output{
  background:var(--accent-wash); border-color:var(--accent-dark);
  padding:16px 28px;
}
.formula-box.output .formula-output-label{
  display:block; font-size:0.72rem; color:var(--ink-faint); letter-spacing:0.04em; margin-bottom:4px;
}
.formula-box.output .formula-output-value{
  font-size:1.05rem; font-weight:600; color:var(--ink);
}