:root{
  color-scheme: light only;
  --ink:#101418; --body:#2C363F; --muted:#5D6B75;
  --paper:#EDE7DC; --card:#FBF8F3; --rule:#C9BFAE;
  --amber:#C25A1E; --amber-soft:#F0D9C6;
  --signal:#0E6E63; --warn:#8A2E24; --warn-bg:#F6E4E0;
  --maxw:1060px;
}
*{box-sizing:border-box;}
html{
  scroll-behavior:smooth;-webkit-text-size-adjust:100%;
  background:#EDE7DC !important;color-scheme:light only;
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto;}}
body{
  margin:0;background:#EDE7DC !important;color:#2C363F !important;min-height:100vh;
  font-family:"Bricolage Grotesque",system-ui,sans-serif;
  font-size:17.5px;line-height:1.62;-webkit-font-smoothing:antialiased;
}

/* Some in-app browsers force a dark canvas — pin surfaces and text explicitly. */
main,.hero,section,.axon-block{background:transparent;}
h1,h2,h3,h4,.fact .big,.pull,strong,dt{color:#101418 !important;}
p,li,.lede,.sd,.v,dd{color:#2C363F !important;}
.axon-cap span,.lg,.meta{color:#5D6B75 !important;}
.eyebrow,.num{color:#C25A1E !important;}
.pull b,.hero h1 em{color:#C25A1E !important;}
.caution h3,.caution .eyebrow{color:#8A2E24 !important;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 clamp(24px,4.5vw,56px);}
.eyebrow{font-family:"JetBrains Mono",monospace;font-size:11.5px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;}

/* NAV */
header.nav{position:sticky;top:0;z-index:60;background:#EDE7DC !important;border-bottom:1.5px solid var(--ink);}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:56px;gap:16px;}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-family:"JetBrains Mono",monospace;font-size:12.5px;font-weight:600;letter-spacing:.06em;white-space:nowrap;}
.nav-links{display:flex;gap:18px;flex-wrap:wrap;}
.nav-links a{font-size:13.5px;color:var(--body);text-decoration:none;font-weight:500;}
.nav-links a:hover{color:var(--amber);}
@media(max-width:1080px){.nav-links{display:none;}}

/* LANGUAGE SWITCHER */
.langs{display:flex;gap:2px;border:1.5px solid var(--ink);border-radius:2px;overflow:hidden;flex:none;}
.langs a{
  font-family:"JetBrains Mono",monospace;font-size:11.5px;font-weight:600;letter-spacing:.06em;
  padding:6px 9px;text-decoration:none;color:var(--body);background:#FBF8F3;
}
.langs a:hover{background:var(--amber-soft);}
.langs a.on{background:var(--ink);color:#FBF8F3;}

/* HERO */
.hero{padding-top:58px;}
.hero h1{font-weight:800;font-size:clamp(38px,8vw,88px);line-height:.97;letter-spacing:-.035em;margin:18px 0 0;max-width:15ch;}
.hero h1 em{font-family:"Newsreader",Georgia,serif;font-weight:300;font-style:italic;letter-spacing:-.01em;}
.lede{font-size:clamp(17.5px,2.1vw,21px);max-width:58ch;margin:26px 0 0;}
.stance{margin:24px 0 0;padding:16px 18px;background:#FBF8F3 !important;border:1.5px solid var(--ink);border-radius:2px;max-width:60ch;font-size:16px;box-shadow:4px 4px 0 var(--ink);}

/* AXON */
.axon-block{margin:44px 0 0;padding:26px 0 16px;border-top:1.5px solid var(--ink);border-bottom:1.5px solid var(--ink);}
.axon-cap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;margin-bottom:14px;}
.axon-cap span{font-family:"JetBrains Mono",monospace;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;}
svg.axon{width:100%;height:56px;display:block;overflow:visible;}
.fiber{stroke:var(--rule);stroke-width:2.5;}
.sheath{stroke:var(--signal);stroke-width:13;stroke-linecap:round;fill:none;}
.sheath.damaged{stroke:var(--amber-soft);stroke-dasharray:3 5;}
.node{fill:var(--ink);} .lesion{fill:none;stroke:var(--amber);stroke-width:2;stroke-dasharray:3 3;} .pulse{fill:var(--amber);}
@media (prefers-reduced-motion:no-preference){.pulse{animation:run 7s cubic-bezier(.2,0,.35,1) infinite;}}
@keyframes run{0%{transform:translateX(0);opacity:0}4%{opacity:1}38%{transform:translateX(430px)}62%{transform:translateX(560px)}96%{transform:translateX(1000px);opacity:1}100%{transform:translateX(1000px);opacity:0}}
.axon-legend{display:flex;gap:22px;flex-wrap:wrap;margin-top:12px;}
.lg{display:flex;align-items:center;gap:8px;font-size:13px;}
.sw{width:22px;height:7px;border-radius:4px;background:var(--signal);display:inline-block;}
.sw.dmg{background:repeating-linear-gradient(90deg,var(--amber) 0 3px,transparent 3px 6px);}

/* FACTS */
.facts{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:34px 0 8px;}
.fact{background:#FBF8F3 !important;border:1.5px solid var(--ink);border-radius:2px;padding:20px;box-shadow:4px 4px 0 var(--ink);}
.fact .big{font-weight:800;font-size:38px;line-height:1;letter-spacing:-.03em;}
.fact .big.sm{font-size:26px;}
.fact .k{margin-top:10px;font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--amber) !important;}
.fact .v{margin-top:8px;font-size:15px;line-height:1.5;}
@media(max-width:820px){.facts{grid-template-columns:1fr;}}

/* SECTIONS */
section{padding:58px 0;border-top:1.5px solid var(--rule);}
.sec-head{margin-bottom:24px;}
.sec-head .num{font-family:"JetBrains Mono",monospace;font-size:12px;font-weight:600;letter-spacing:.16em;}
h2{font-weight:800;letter-spacing:-.03em;font-size:clamp(28px,4.8vw,45px);line-height:1.03;margin:8px 0 0;max-width:20ch;}
h3{font-weight:600;font-size:18.5px;margin:0 0 8px;}
h4{font-weight:600;font-size:16px;margin:20px 0 6px;}
p{margin:0 0 16px;max-width:68ch;}

.pull{font-family:"Newsreader",Georgia,serif;font-weight:300;font-style:italic;font-size:clamp(23px,3.8vw,38px);line-height:1.19;max-width:23ch;margin:30px 0;letter-spacing:-.01em;}
.pull b{font-style:normal;font-family:"Bricolage Grotesque",sans-serif;font-weight:800;}

.card{background:#FBF8F3 !important;border:1.5px solid var(--ink);border-radius:2px;padding:22px 24px;box-shadow:4px 4px 0 var(--ink);margin-bottom:20px;}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;}
.grid2 .card,.grid3 .card{margin-bottom:0;}
@media(max-width:760px){.grid2,.grid3{grid-template-columns:1fr;}}
.card p:last-child,.card ul:last-child{margin-bottom:0;}

ol.steps{list-style:none;margin:0;padding:0;counter-reset:s;}
ol.steps li{counter-increment:s;display:grid;grid-template-columns:56px 1fr;gap:18px;padding:20px 0;border-top:1.5px solid var(--rule);}
ol.steps li:last-child{border-bottom:1.5px solid var(--rule);}
ol.steps li::before{content:counter(s,decimal-leading-zero);font-family:"JetBrains Mono",monospace;font-weight:600;font-size:13px;color:var(--amber) !important;padding-top:5px;}
ol.steps .st{display:block;font-weight:600;color:var(--ink) !important;font-size:18px;margin-bottom:4px;}
ol.steps .sd{font-size:16px;}
@media(max-width:560px){ol.steps li{grid-template-columns:38px 1fr;gap:12px;}}

ul.plain{margin:4px 0 0;padding:0;list-style:none;}
ul.plain li{position:relative;padding:10px 0 10px 24px;border-bottom:1px solid var(--rule);font-size:16px;}
ul.plain li:last-child{border-bottom:none;}
ul.plain li::before{content:"";position:absolute;left:2px;top:19px;width:9px;height:2px;background:var(--signal);}
ul.warnlist li::before{background:var(--warn);}
ul.check li::before{content:"?";background:none;left:0;top:9px;width:auto;height:auto;color:var(--signal);font-weight:600;font-family:"JetBrains Mono",monospace;font-size:14px;}
.card.good h3::before{content:"+ ";color:var(--signal);font-family:"JetBrains Mono",monospace;}
.card.bad h3::before{content:"— ";color:var(--amber);font-family:"JetBrains Mono",monospace;}

/* GLOSSARY */
dl.gloss{margin:0;display:grid;grid-template-columns:minmax(150px,220px) 1fr;gap:0;}
dl.gloss dt{font-weight:600;padding:14px 16px 14px 0;border-top:1px solid var(--rule);}
dl.gloss dd{margin:0;padding:14px 0;border-top:1px solid var(--rule);font-size:16px;}
dl.gloss dt:first-of-type,dl.gloss dd:first-of-type{border-top:none;}
@media(max-width:640px){
  dl.gloss{grid-template-columns:1fr;}
  dl.gloss dt{padding:14px 0 2px;}
  dl.gloss dd{padding:0 0 14px;border-top:none;}
}

/* FAQ */
details{border-bottom:1px solid var(--rule);padding:2px 0;}
details summary{cursor:pointer;list-style:none;padding:16px 30px 16px 0;font-weight:600;color:var(--ink);position:relative;font-size:17px;}
details summary::-webkit-details-marker{display:none;}
details summary::after{content:"+";position:absolute;right:4px;top:14px;font-family:"JetBrains Mono",monospace;color:var(--amber);font-size:20px;}
details[open] summary::after{content:"–";}
details .ans{padding:0 0 18px;max-width:68ch;}

.caution{background:#F6E4E0 !important;border:1.5px solid var(--warn);border-radius:2px;padding:24px;box-shadow:4px 4px 0 var(--warn);margin-top:22px;}
.caution ul.plain li{border-bottom-color:#E2C6C0;}

.note{border-left:3px solid var(--amber);padding:4px 0 4px 16px;margin:20px 0;font-size:16px;max-width:66ch;}
.meta{font-family:"JetBrains Mono",monospace;font-size:12px;letter-spacing:.06em;}

/* BRAIN SCHEMATIC — healthy vs. MS conduction */
.brains-fig{margin:28px 0;}
.brains-fig .eyebrow{display:block;margin-bottom:12px;}
.brains{display:grid;grid-template-columns:1fr 1fr;gap:20px;}
@media(max-width:560px){.brains{grid-template-columns:1fr;}}
figure.brain{margin:0;background:#FBF8F3 !important;border:1.5px solid var(--ink);border-radius:2px;
  box-shadow:4px 4px 0 var(--ink);padding:14px 16px 16px;}
figure.brain svg{width:100%;height:auto;display:block;}
figure.brain figcaption{margin-top:8px;}
figure.brain figcaption b{display:block;font-size:15.5px;color:var(--ink) !important;}
figure.brain figcaption span{display:block;font-size:13.5px;color:var(--muted) !important;line-height:1.45;margin-top:2px;}
figure.brain.affected figcaption b{color:var(--warn) !important;}
.brain-note{font-family:"JetBrains Mono",monospace;font-size:11px;letter-spacing:.04em;
  color:var(--muted) !important;margin:12px 0 0;}

.brain-shell{fill:#F4EFE6;stroke:var(--ink);stroke-width:2;stroke-linejoin:round;}
.brain-gyri{fill:none;stroke:var(--rule);stroke-width:1.5;stroke-linecap:round;}
.brain-path{fill:none;stroke:var(--signal);stroke-width:2.5;stroke-linecap:round;opacity:.45;}
.brain-path.dim{stroke:var(--amber);stroke-dasharray:4 4;opacity:.5;}
.brain-node{fill:var(--ink);}
.brain-origin{fill:var(--signal);}
.brain-lesion{fill:var(--warn-bg);stroke:var(--amber);stroke-width:2;stroke-dasharray:3 3;}
.bpulse{fill:var(--signal);}
.bpulse.slow{fill:var(--amber);}
@media (prefers-reduced-motion:no-preference){
  .bpulse{offset-rotate:0deg;animation:bflow 2.6s linear infinite;}
  @keyframes bflow{0%{offset-distance:0%;opacity:0}10%{opacity:1}90%{opacity:1}100%{offset-distance:100%;opacity:0}}
  .bpulse.slow{animation:bflowslow 4.2s cubic-bezier(.25,0,.1,1) infinite;}
  @keyframes bflowslow{
    0%{offset-distance:0%;opacity:0}
    12%{opacity:1}
    42%{offset-distance:44%;opacity:1}
    58%{offset-distance:50%;opacity:.2}
    76%{offset-distance:64%;opacity:.45}
    100%{offset-distance:100%;opacity:.55}
  }
}
@media (prefers-reduced-motion:reduce){
  /* Pulses are positioned solely by offset-path; with no animation they'd
     collapse to the corner, so hide them — lesions + captions carry the story. */
  .bpulse{display:none;}
}

/* GAMES */
.games{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0 6px;}
@media(max-width:760px){.games{grid-template-columns:1fr;}}
.game{background:#FBF8F3 !important;border:1.5px solid var(--ink);border-radius:2px;padding:22px 22px 24px;box-shadow:4px 4px 0 var(--ink);display:flex;flex-direction:column;}
.game[data-game="reaction"],.game[data-game="symbols"]{grid-column:1 / -1;}
.game-head h3{margin:6px 0 6px;font-size:20px;}
.game-head p{font-size:15px;margin:0 0 16px;color:var(--body) !important;}
.game-tag{font-family:"JetBrains Mono",monospace;font-size:10.5px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--amber) !important;}
.game-stage{margin-top:auto;}

.g-btn{font-family:"Bricolage Grotesque",system-ui,sans-serif;font-size:15px;font-weight:600;
  padding:11px 16px;border:1.5px solid var(--ink);border-radius:2px;background:#EDE7DC !important;
  color:var(--ink) !important;cursor:pointer;transition:transform .06s ease,background .12s ease;}
.g-btn:hover{background:var(--amber-soft) !important;}
.g-btn:active{transform:translateY(1px);}
.g-btn.primary{background:var(--ink) !important;color:#FBF8F3 !important;}
.g-btn.primary:hover{background:var(--amber) !important;}
.g-btn.ok{background:var(--signal) !important;color:#fff !important;border-color:var(--signal);}
.g-btn.no{background:var(--warn) !important;color:#fff !important;border-color:var(--warn);}

/* Reaction */
.g-react{width:100%;border:1.5px dashed var(--rule);border-radius:2px;background:#F4EFE6 !important;
  min-height:118px;display:flex;align-items:center;justify-content:center;cursor:pointer;
  font-family:"JetBrains Mono",monospace;font-weight:600;letter-spacing:.04em;transition:background .05s ease,border-color .05s ease;}
.g-react-label{color:var(--muted) !important;font-size:14px;text-align:center;padding:0 14px;}
.g-react.wait{background:#F0D9C6 !important;border-style:solid;border-color:var(--amber);}
.g-react.wait .g-react-label{color:var(--amber) !important;}
.g-react.live{background:var(--signal) !important;border-color:var(--signal);}
.g-react.live .g-react-label{color:#fff !important;font-size:19px;letter-spacing:.08em;}
.g-react.done{background:#FBF8F3 !important;border-style:solid;border-color:var(--ink);}
.g-react.done .g-react-label{color:var(--ink) !important;font-size:22px;}
.g-react.bad{background:var(--warn-bg) !important;border-color:var(--warn);}
.g-react.bad .g-react-label{color:var(--warn) !important;}
.g-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px;}
.g-stat{border:1px solid var(--rule);border-radius:2px;padding:10px 12px;text-align:center;}
.g-stat-v{font-weight:800;font-size:19px;color:var(--ink) !important;letter-spacing:-.02em;}
.g-stat-k{margin-top:4px;font-family:"JetBrains Mono",monospace;font-size:9.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted) !important;}

/* Stroop */
.g-stroop-head{display:flex;gap:10px;margin-bottom:12px;}
.g-pill{font-family:"JetBrains Mono",monospace;font-size:12px;font-weight:600;padding:5px 10px;
  border:1.5px solid var(--ink);border-radius:2px;background:#EDE7DC !important;color:var(--ink) !important;}
.g-stroop-q{font-size:14px;color:var(--muted) !important;margin-bottom:8px;min-height:20px;}
.g-stroop-word{font-weight:800;font-size:clamp(38px,7vw,58px);line-height:1;letter-spacing:-.03em;
  text-align:center;min-height:64px;margin:6px 0 16px;text-transform:uppercase;}
.g-stroop-opts{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-bottom:14px;}
.g-stroop-opts .g-btn{width:100%;}

/* Memory */
.g-mem-status{font-family:"JetBrains Mono",monospace;font-size:13px;font-weight:600;letter-spacing:.04em;
  color:var(--ink) !important;min-height:20px;margin-bottom:14px;}
.g-mem-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:16px;}
.g-pad{--pad:var(--signal);aspect-ratio:5/2;border:1.5px solid var(--ink);border-radius:2px;
  background:#F4EFE6 !important;cursor:pointer;position:relative;transition:background .08s ease,box-shadow .08s ease;}
.g-pad::after{content:"";position:absolute;inset:10px;border-radius:2px;
  background:var(--pad);opacity:.28;transition:opacity .08s ease;}
.g-pad:hover::after{opacity:.42;}
.g-pad.lit{background:var(--pad) !important;box-shadow:0 0 0 3px var(--paper),0 0 0 4.5px var(--pad);}
.g-pad.lit::after{opacity:1;}

/* Symbols (SDMT-style) */
.g-key{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin-bottom:16px;}
.g-key-cell{border:1.5px solid var(--ink);border-radius:2px;background:#EDE7DC !important;
  padding:8px 4px 6px;display:flex;flex-direction:column;align-items:center;gap:4px;}
.g-key-d{font-family:"JetBrains Mono",monospace;font-weight:600;font-size:15px;color:var(--ink) !important;}
.g-glyph{width:22px;height:22px;display:block;color:var(--ink);fill:currentColor;}
.g-sym-target{display:flex;align-items:center;justify-content:center;min-height:92px;
  border:1.5px dashed var(--rule);border-radius:2px;background:#F4EFE6 !important;margin:6px 0 16px;}
.g-sym-target .g-glyph{width:56px;height:56px;color:var(--signal);}
.g-sym-opts{display:grid;grid-template-columns:repeat(6,1fr);gap:10px;margin-bottom:14px;}
.g-sym-opts .g-btn{width:100%;font-family:"JetBrains Mono",monospace;font-size:18px;padding:12px 0;}
@media(max-width:560px){
  .g-key{grid-template-columns:repeat(3,1fr);}
  .g-sym-opts{grid-template-columns:repeat(3,1fr);}
}

footer{background:var(--ink);color:#C6CDD3;padding:52px 0 64px;}
footer .eyebrow{color:#E7A063 !important;}
footer h2{color:#ffffff !important;font-size:clamp(24px,3.4vw,34px);max-width:24ch;margin:12px 0 16px;}
footer p{color:#B3BFC7 !important;font-size:15px;max-width:72ch;}
footer strong{color:#F1F4F6 !important;}
footer a{color:#E7A063;}

.reveal{opacity:0;transform:translateY(16px);transition:opacity .55s ease,transform .55s ease;}
.reveal.in{opacity:1;transform:none;}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none;}}
a:focus-visible,summary:focus-visible{outline:2.5px solid var(--amber);outline-offset:3px;}

@media print{
  .nav,.axon-block,.langs{display:none;}
  body{background:#fff !important;}
  .card,.caution{box-shadow:none;}
  .reveal{opacity:1;transform:none;}
}