:root{
  --ink:#0B131B;
  --surface:#16222E;
  --surface-2:#1E2E3D;
  --line:#2A3B4B;
  --frost:#F6F8FA;
  --frost-dim:#9FB9CF;
  --moon:#E8A33D;
  --moss:#5FA88A;
  --ember:#E8A33D;
  --danger:#C4643A;
  --display:'Archivo','Helvetica Neue',Arial,sans-serif;
  --body:'Source Serif 4',Georgia,serif;
  --mono:'IBM Plex Mono','SFMono-Regular',Consolas,monospace;
  --measure:64rem;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;transition-duration:.001ms!important}
}
body{
  margin:0;
  background:var(--ink);
  color:var(--frost);
  font-family:var(--body);
  font-size:17px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
.wrap{max-width:var(--measure);margin:0 auto;padding:0 1.5rem}

/* ---------- type ---------- */
.eyebrow{
  font-family:var(--mono);
  font-size:.72rem;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--moon);
  margin:0 0 1rem;
}
h1{
  font-family:var(--display);
  font-weight:900;
  font-size:clamp(2.6rem,7vw,5rem);
  line-height:.94;
  letter-spacing:-.03em;
  margin:0 0 1.25rem;
  text-transform:uppercase;
}
h2{
  font-family:var(--display);
  font-weight:800;
  font-size:clamp(1.6rem,3.6vw,2.4rem);
  line-height:1.05;
  letter-spacing:-.02em;
  margin:0 0 .75rem;
  text-transform:uppercase;
}
h3{
  font-family:var(--display);
  font-weight:700;
  font-size:1.05rem;
  letter-spacing:.04em;
  text-transform:uppercase;
  margin:0 0 .6rem;
}
.lede{
  font-size:clamp(1.05rem,2vw,1.3rem);
  color:var(--frost-dim);
  max-width:44ch;
  margin:0 0 2rem;
}
code,kbd,samp{font-family:var(--mono);font-size:.86em}

/* ---------- hero ---------- */
.hero{padding:5rem 0 3rem;border-bottom:1px solid var(--line)}
.hero-rule{
  width:3.5rem;height:3px;background:var(--moon);
  margin-bottom:2rem;
}

/* ---------- trace ---------- */
.trace{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:3px;
  padding:1.75rem 1.5rem 1.5rem;
  margin:2.5rem 0 0;
}
.trace-head{
  display:flex;flex-wrap:wrap;gap:1rem;
  align-items:center;justify-content:space-between;
  margin-bottom:2rem;
}
.trace-title{
  font-family:var(--mono);font-size:.75rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--frost-dim);margin:0;
}
.controls{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}

.btn{
  font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;
  text-transform:uppercase;
  background:var(--moon);color:var(--ink);
  border:1px solid var(--moon);
  padding:.6rem 1.1rem;border-radius:2px;
  cursor:pointer;font-weight:500;
  transition:background .15s,color .15s;
}
.btn:hover{background:#F0B961;border-color:#F0B961}
.btn[disabled]{opacity:.4;cursor:not-allowed}
.btn-ghost{background:transparent;color:var(--frost-dim);border-color:var(--line)}
.btn-ghost:hover{background:var(--surface-2);color:var(--frost);border-color:var(--frost-dim)}
:focus-visible{outline:2px solid var(--moon);outline-offset:3px}

.toggle{
  display:inline-flex;align-items:center;gap:.6rem;
  font-family:var(--mono);font-size:.75rem;letter-spacing:.08em;
  text-transform:uppercase;color:var(--frost-dim);cursor:pointer;
  user-select:none;
}
.toggle input{position:absolute;opacity:0;width:1px;height:1px}
.switch{
  width:2.6rem;height:1.35rem;border-radius:1rem;
  background:var(--moss);border:1px solid transparent;
  position:relative;transition:background .2s;flex:none;
}
.switch::after{
  content:"";position:absolute;top:2px;left:2px;
  width:1.05rem;height:1.05rem;border-radius:50%;
  background:var(--ink);transition:transform .2s;
}
.toggle input:not(:checked) + .switch{background:var(--surface-2);border-color:var(--line)}
.toggle input:not(:checked) + .switch::after{transform:translateX(1.2rem);background:var(--danger)}
.toggle input:focus-visible + .switch{outline:2px solid var(--moon);outline-offset:3px}

.track{
  position:relative;
  display:flex;justify-content:space-between;align-items:flex-start;
  gap:.5rem;
  padding:0 0 .5rem;
}
.track::before{
  content:"";position:absolute;
  left:6%;right:6%;top:1.15rem;height:1px;
  background:var(--line);
}
.gate{
  position:relative;z-index:1;
  flex:1 1 0;min-width:0;
  display:flex;flex-direction:column;align-items:center;gap:.6rem;
  background:none;border:0;padding:0;
  color:inherit;font:inherit;cursor:pointer;
  text-align:center;
}
.node{
  width:2.3rem;height:2.3rem;border-radius:50%;
  background:var(--ink);border:1px solid var(--line);
  display:grid;place-items:center;
  font-family:var(--mono);font-size:.78rem;color:var(--frost-dim);
  transition:border-color .25s,background .25s,color .25s,box-shadow .25s;
  flex:none;
}
.gate-name{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;
  text-transform:uppercase;color:var(--frost-dim);
  transition:color .25s;line-height:1.3;
}
.gate.lit .node{border-color:var(--moss);color:var(--moss);box-shadow:0 0 0 4px rgba(95,168,138,.16)}
.gate.lit .gate-name{color:var(--frost)}
.gate.failed .node{border-color:var(--danger);color:var(--danger);background:rgba(196,100,58,.15);box-shadow:0 0 0 4px rgba(196,100,58,.16)}
.gate.failed .gate-name{color:var(--danger)}
.gate:hover .gate-name{color:var(--frost)}

.pulse{
  position:absolute;top:1.15rem;left:0;
  width:.65rem;height:.65rem;border-radius:50%;
  background:var(--moon);
  margin:-.325rem 0 0 -.325rem;
  opacity:0;pointer-events:none;z-index:2;
  box-shadow:0 0 12px 2px rgba(232,163,61,.55);
}
.pulse.on{opacity:1}
.pulse.bad{background:var(--danger);box-shadow:0 0 14px 3px rgba(196,100,58,.6)}

.readout{
  margin-top:1.5rem;
  border-top:1px solid var(--line);
  padding-top:1.1rem;
  font-family:var(--mono);font-size:.82rem;line-height:1.7;
  color:var(--frost-dim);
  min-height:5.5rem;
}
.readout p{margin:0 0 .3rem}
.readout .ok{color:var(--moss)}
.readout .bad{color:var(--danger)}
.readout .note{color:var(--frost);margin-top:.7rem;font-family:var(--body);font-size:.95rem;line-height:1.6}

/* ---------- gate detail sections ---------- */
.section{padding:4.5rem 0;border-bottom:1px solid var(--line)}
.section-head{display:flex;gap:1.25rem;align-items:baseline;margin-bottom:1.75rem}
.marker{
  font-family:var(--mono);font-size:.75rem;letter-spacing:.14em;
  color:var(--moon);flex:none;padding-top:.35rem;
}
.what{color:var(--frost-dim);max-width:60ch;margin:0 0 2rem}

.compare{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:3px;overflow:hidden}
.pane{background:var(--surface);padding:1.4rem 1.35rem}
.pane h3{display:flex;align-items:center;gap:.5rem}
.pane h3::before{content:"";width:.5rem;height:.5rem;border-radius:50%;flex:none}
.pane-open h3{color:var(--danger)}
.pane-open h3::before{background:var(--danger)}
.pane-warded h3{color:var(--moss)}
.pane-warded h3::before{background:var(--moss)}
.pane ul{margin:0;padding-left:1.05rem}
.pane li{margin-bottom:.55rem;font-size:.95rem;color:var(--frost-dim)}
.pane li:last-child{margin-bottom:0}
.pane strong{color:var(--frost);font-weight:600}

.artifact{
  margin-top:1.5rem;background:#0B131B;border:1px solid var(--line);
  border-radius:3px;overflow:hidden;
}
.artifact-bar{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--frost-dim);
  padding:.55rem .9rem;border-bottom:1px solid var(--line);
  background:var(--surface);
}
.artifact pre{
  margin:0;padding:1rem .9rem;overflow-x:auto;
  font-family:var(--mono);font-size:.79rem;line-height:1.75;color:var(--frost-dim);
}
.artifact .hl{color:var(--moss)}
.artifact .warn{color:var(--ember)}
.artifact .err{color:var(--danger)}
.artifact .cmd{color:var(--moon)}

/* ---------- spf tool ---------- */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:3px;padding:1.6rem 1.4rem;margin-top:1.5rem}
.tool label{display:block;font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--frost-dim);margin-bottom:.6rem}
.tool textarea{
  width:100%;min-height:5.5rem;resize:vertical;
  background:#0B131B;color:var(--frost);
  border:1px solid var(--line);border-radius:2px;
  padding:.8rem;font-family:var(--mono);font-size:.82rem;line-height:1.6;
}
.tool textarea:focus{outline:2px solid var(--moon);outline-offset:1px;border-color:var(--moon)}
.tool-actions{display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.9rem}
.meter{margin-top:1.4rem;display:none}
.meter.show{display:block}
.meter-top{display:flex;justify-content:space-between;align-items:baseline;font-family:var(--mono);font-size:.78rem;letter-spacing:.08em;text-transform:uppercase;margin-bottom:.5rem}
.meter-count{font-family:var(--display);font-weight:900;font-size:2.1rem;letter-spacing:-.02em;line-height:1}
.bar{height:.5rem;background:var(--surface-2);border-radius:2px;overflow:hidden}
.bar span{display:block;height:100%;width:0;background:var(--moss);transition:width .5s ease,background .3s}
.bar.over span{background:var(--danger)}
.verdict{margin-top:.9rem;font-size:.95rem;color:var(--frost-dim)}
.verdict.over{color:var(--danger)}
.breakdown{margin-top:1rem;font-family:var(--mono);font-size:.78rem;color:var(--frost-dim);line-height:1.9}
.breakdown div{display:flex;justify-content:space-between;gap:1rem;border-bottom:1px dotted var(--line);padding-bottom:.15rem}

/* ---------- quiz ---------- */
.quiz{background:var(--surface);border:1px solid var(--line);border-radius:3px;padding:1.75rem 1.5rem}
.q{margin-bottom:2rem}
.q:last-of-type{margin-bottom:1rem}
.q p{margin:0 0 .9rem;font-weight:500}
.opts{display:flex;flex-direction:column;gap:.5rem}
.opt{
  text-align:left;background:var(--ink);border:1px solid var(--line);
  color:var(--frost-dim);border-radius:2px;padding:.7rem .9rem;
  font:inherit;font-size:.94rem;cursor:pointer;
  transition:border-color .15s,color .15s,background .15s;
}
.opt:hover{border-color:var(--frost-dim);color:var(--frost)}
.opt.right{border-color:var(--moss);color:var(--moss);background:rgba(95,168,138,.10)}
.opt.wrong{border-color:var(--danger);color:var(--danger);background:rgba(196,100,58,.10)}
.why{margin-top:.75rem;font-size:.9rem;color:var(--frost-dim);border-left:2px solid var(--moss);padding-left:.85rem;display:none}
.why.miss{border-left-color:var(--danger)}
.why.show{display:block}

/* ---------- cta ---------- */
.cta{padding:5rem 0;text-align:center}
.cta p{color:var(--frost-dim);max-width:50ch;margin:0 auto 2rem}
.btn-lg{font-size:.85rem;padding:.9rem 1.9rem}

footer{border-top:1px solid var(--line);padding:2rem 0;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--frost-dim);text-align:center}

/* ---------- responsive ---------- */
@media (max-width:760px){
  .compare{grid-template-columns:1fr}
  .track{flex-direction:column;align-items:stretch;gap:1.1rem;padding-left:.25rem}
  .track::before{left:1.15rem;right:auto;top:1rem;bottom:1rem;height:auto;width:1px}
  .gate{flex-direction:row;align-items:center;gap:.9rem;text-align:left}
  .gate-name{font-size:.72rem}
  .pulse{top:0;left:1.15rem}
  .section-head{flex-direction:column;gap:.4rem}
  .marker{padding-top:0}
}

/* inline-style replacements — keeps style-src 'self' clean */
.eyebrow.flush{margin:0}
.what.toolnote{margin-top:1.25rem;font-size:.9rem}