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:root{
  /* Layout idea: a field notebook on stress. One reading column. Each chapter = try it first, then the name for it.
     Three triad colours carry meaning everywhere: fragile = red, robust = stone, antifragile = green. */
  --ink:#10130f;
  --panel:#181c17;
  --panel-2:#20261f;
  --line:#2f372d;
  --text:#ece6d6;
  --muted:#9ba494;
  --fragile:#ff6a5c;
  --robust:#a9b4c2;
  --anti:#6fe39a;
  --amber:#f3b63a;
  --display:"Chakra Petch", "Arial Narrow", sans-serif;
  --body:"Source Serif 4", Georgia, "Times New Roman", serif;
  --mono:"IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;
  color-scheme:dark;
}
*{box-sizing:border-box}
html,body{margin:0}
html{scroll-behavior:smooth}
body{background:var(--ink);color:var(--text);font-family:var(--body);font-size:18px;line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--anti)}
:focus-visible{outline:2px solid var(--amber);outline-offset:3px}
h1,h2,h3{font-family:var(--display);text-wrap:balance;line-height:1.04;margin:0;letter-spacing:.01em}
h2{font-size:clamp(2rem,6vw,3.1rem);text-transform:uppercase}
h3{font-size:1.35rem;text-transform:uppercase}
p{margin:0}
i,em{font-style:italic}
.mono{font-family:var(--mono);font-size:.76rem;letter-spacing:.06em;text-transform:uppercase}
.muted{color:var(--muted)}
.wrap{max-width:860px;margin:0 auto;padding:0 20px}
.f{color:var(--fragile)} .r{color:var(--robust)} .a{color:var(--anti)} .am{color:var(--amber)}

/* progress */
.progress{position:sticky;top:0;z-index:20;background:rgba(16,19,15,.94);backdrop-filter:blur(6px);border-bottom:1px solid var(--line)}
.progress .bar{height:3px;background:linear-gradient(90deg,var(--fragile),var(--robust),var(--anti));width:0%}
.progress nav{display:flex;gap:4px;overflow-x:auto;padding:8px 16px;scrollbar-width:none}
.progress nav::-webkit-scrollbar{display:none}
.progress nav a{font-family:var(--mono);font-size:.7rem;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);text-decoration:none;padding:4px 9px;border:1px solid transparent;border-radius:3px;white-space:nowrap}
.progress nav a.on{color:var(--text);border-color:var(--line);background:var(--panel)}

/* hero */
header.hero{padding:52px 0 40px;border-bottom:1px solid var(--line)}
.back{font-family:var(--mono);font-size:.75rem;color:var(--muted);text-decoration:none}
.back:hover{color:var(--text)}
.kicker{margin-top:26px;color:var(--amber)}
.hero{container-type:inline-size}
.hero h1{margin-top:10px;font-size:min(clamp(2.8rem,10vw,6rem),100cqi / 8);font-weight:700;text-transform:uppercase}
.hero .by{margin-top:10px;color:var(--muted)}
.hero .lede{margin-top:24px;font-size:1.2rem;max-width:62ch}
.triad{margin-top:30px;display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.triad div{background:var(--panel);border:1px solid var(--line);border-top:4px solid;padding:14px 16px}
.triad .t-f{border-top-color:var(--fragile)} .triad .t-r{border-top-color:var(--robust)} .triad .t-a{border-top-color:var(--anti)}
.triad b{font-family:var(--display);text-transform:uppercase;font-size:1.15rem;display:block}
.triad span{font-size:.92rem;color:var(--muted)}
.sixty{margin-top:30px;background:var(--panel);border:1px solid var(--line);border-left:4px solid var(--amber);padding:20px 24px;display:grid;gap:10px}
.sixty ol{margin:0;padding-left:1.3em;display:grid;gap:6px}
.sixty li::marker{font-family:var(--mono);color:var(--amber)}

/* chapters */
section.ch{padding:64px 0;border-bottom:1px solid var(--line);scroll-margin-top:50px}
.ch .num{color:var(--amber);margin-bottom:10px}
.ch .intro{margin-top:16px;max-width:64ch}
.lab{margin-top:28px;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:22px}
.lab .lab-h{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;margin-bottom:14px;color:var(--muted)}
.named{margin-top:24px;border-left:3px solid var(--anti);padding:4px 0 4px 18px;display:grid;gap:8px;max-width:66ch}
.named .mono{color:var(--anti)}
.named.hide{display:none}
canvas{display:block;width:100%;background:var(--ink);border:1px solid var(--line);border-radius:4px}
.controls{display:flex;flex-wrap:wrap;gap:14px 22px;align-items:center;margin-top:16px}
.controls label{display:grid;gap:4px;font-family:var(--mono);font-size:.74rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);min-width:200px;flex:1}
.controls output{color:var(--text)}
input[type=range]{width:100%;accent-color:var(--amber)}
button{font:inherit;font-family:var(--mono);font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;background:var(--panel-2);color:var(--text);border:1px solid var(--line);border-radius:4px;padding:9px 14px;cursor:pointer}
button:hover{border-color:var(--muted)}
button.primary{background:var(--amber);color:#1a1405;border-color:var(--amber);font-weight:600}
button.sel{border-color:var(--amber);color:var(--amber)}
button:disabled{opacity:.45;cursor:default}
.readout{margin-top:14px;font-family:var(--mono);font-size:.82rem;color:var(--muted);min-height:1.4em}
.readout b{color:var(--text);font-weight:600}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.card{background:var(--panel-2);border:1px solid var(--line);border-radius:5px;padding:14px}
.card h3{font-size:1.05rem}
.card .big{font-family:var(--display);font-size:2rem;line-height:1.1;margin-top:6px}
.mt{margin-top:16px}
.lab .grid3{margin-top:16px}
.card .small{font-size:.9rem;color:var(--muted);margin-top:4px}

/* shock lab */
.objects{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:4px}
.obj{background:var(--panel-2);border:1px solid var(--line);border-radius:5px;padding:12px;text-align:center}
.obj canvas{border:0;background:transparent}
.obj .state{font-family:var(--mono);font-size:.76rem;text-transform:uppercase;margin-top:6px}

/* sorter */
.sort-item{display:grid;grid-template-columns:1fr auto;gap:10px;align-items:center;padding:10px 0;border-top:1px solid var(--line)}
.sort-item:first-child{border-top:0}
.sort-item .btns{display:flex;gap:6px;flex-wrap:wrap;justify-content:flex-end}
.sort-item .btns button{padding:6px 9px;font-size:.7rem}
.sort-item .why{grid-column:1/-1;font-size:.92rem;color:var(--muted);display:none}
.sort-item.done .why{display:block}
.sort-item button.right{background:rgba(111,227,154,.15);border-color:var(--anti);color:var(--anti)}
.sort-item button.wrong{background:rgba(255,106,92,.12);border-color:var(--fragile);color:var(--fragile)}

/* allocations */
.alloc{display:flex;height:26px;border-radius:4px;overflow:hidden;border:1px solid var(--line);margin-top:10px}
.alloc div{height:100%;transition:width .2s}
.alloc .s{background:var(--robust)} .alloc .m{background:var(--amber)} .alloc .k{background:var(--anti)}
.presets{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px}

/* doctor */
.verdict{margin-top:12px;font-family:var(--display);font-size:1.4rem;text-transform:uppercase}

/* lindy */
.lindy-list{display:grid;gap:8px}
.lindy-row{display:grid;grid-template-columns:minmax(120px,1.2fr) 3fr;gap:12px;align-items:center}
.lindy-row .lbl{font-size:.95rem}
.lindy-row .lbl small{display:block;color:var(--muted);font-family:var(--mono);font-size:.68rem;text-transform:uppercase}
.lindy-track{position:relative;height:18px;background:var(--panel-2);border-radius:3px;overflow:hidden}
.lindy-track .past{position:absolute;left:0;top:0;bottom:0;background:var(--robust);opacity:.55}
.lindy-track .fut{position:absolute;top:0;bottom:0;background:var(--anti)}

/* glossary + quiz */
.gloss{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-top:24px}
.gloss div{background:var(--panel);border:1px solid var(--line);border-radius:5px;padding:14px 16px}
.gloss b{font-family:var(--display);text-transform:uppercase;display:block;color:var(--anti)}
.gloss span{font-size:.94rem}
.q{margin-top:22px}
.q .opts{display:grid;gap:8px;margin-top:10px}
.q .opts button{text-align:left;text-transform:none;font-family:var(--body);font-size:1rem;letter-spacing:0}
.q .opts button.right{border-color:var(--anti);color:var(--anti)}
.q .opts button.wrong{border-color:var(--fragile);color:var(--fragile)}
.q .exp{margin-top:8px;font-size:.94rem;color:var(--muted);display:none}
.q.done .exp{display:block}
.score{margin-top:26px;font-family:var(--display);font-size:1.6rem;text-transform:uppercase}

footer{padding:40px 0 70px;color:var(--muted);font-size:.92rem}
footer p+p{margin-top:10px}

@media (max-width:640px){
  body{font-size:17px}
  .triad,.grid3{grid-template-columns:1fr}
  .objects{gap:6px}
  .obj{padding:6px}
  .obj .state{font-size:.64rem}
  .gloss{grid-template-columns:1fr}
  .sort-item{grid-template-columns:1fr}
  .sort-item .btns{justify-content:flex-start}
  .lab{padding:16px}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
button.lindy-row{text-transform:none;font-family:var(--body);font-size:1rem;letter-spacing:0;text-align:left;width:100%;background:transparent;border:1px solid transparent;padding:6px 8px}
button.lindy-row:hover{border-color:var(--line);background:var(--panel-2)}
.lindy-track .fut{transition:width .5s ease}