/* How AI Works: shared look. Orange and teal are the page's two main series; each chapter says what they mean. */
:root{--bg:#faf8f3;--panel:#f1eee6;--fg:#1f2326;--muted:#5d6468;--faint:#d9d5ca;--line:#8a9094;--a:#007c9e;--b:#c2410c;--gap:rgba(194,65,12,.15);--on:#fff}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){--bg:#16171a;--panel:#212327;--fg:#e9e7e1;--muted:#a3a7a9;--faint:#3a3d42;--line:#7c8286;--a:#1f9dbb;--b:#d96a24;--gap:rgba(217,106,36,.2);--on:#16171a;color-scheme:dark}}
:root[data-theme="dark"]{--bg:#16171a;--panel:#212327;--fg:#e9e7e1;--muted:#a3a7a9;--faint:#3a3d42;--line:#7c8286;--a:#1f9dbb;--b:#d96a24;--gap:rgba(217,106,36,.2);--on:#16171a;color-scheme:dark}
*{box-sizing:border-box}
body{background:var(--bg);color:var(--fg);font:18px/1.6 Newsreader,Georgia,serif;margin:0;padding-block:40px 80px;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
main{max-width:760px;margin:0 auto;display:grid;gap:56px}
header,section{display:grid;gap:16px;min-width:0}
section>*,header>*{min-width:0}
h1,h2,h3{font-weight:600;line-height:1.15;text-wrap:balance;margin:0}
h1{font-size:clamp(38px,8vw,60px);letter-spacing:-.015em}
h2{font-size:clamp(26px,5vw,34px)}
h3{font-size:19px}
p{margin:0;max-width:66ch}
a{color:var(--a)}
.mono,.tag,.kicker,button,label,.read{font-family:"IBM Plex Mono",ui-monospace,Menlo,monospace}
.kicker{font-size:12px;letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.lede{font-size:22px;line-height:1.4}
.verdict{border-left:3px solid var(--fg);padding:4px 0 4px 20px;display:grid;gap:10px}
.point{font-weight:600;font-size:1.06em;line-height:1.35}
.tag{display:inline-block;font-size:10.5px;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);border:1px solid var(--faint);border-radius:3px;padding:0 5px;white-space:nowrap;vertical-align:2px;line-height:1.6}
.fig{background:var(--panel);border-radius:6px;padding:18px;display:grid;gap:14px;min-width:0}
.note{font-size:15.5px;line-height:1.5;color:var(--muted)}
.proves{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.proves>div{border-top:2px solid var(--faint);padding-top:8px;display:grid;gap:4px;align-content:start;font-size:16.5px;line-height:1.45}
.proves b{font:500 12px "IBM Plex Mono",monospace;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.ctrl{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
button{font-size:13px;background:transparent;color:var(--fg);border:1px solid var(--line);border-radius:4px;padding:6px 11px;cursor:pointer;min-height:36px}
button[aria-pressed="true"]{background:var(--fg);color:var(--bg);border-color:var(--fg)}
button:focus-visible,input:focus-visible,svg:focus-visible,summary:focus-visible{outline:2px solid var(--a);outline-offset:2px}
input[type=range]{width:100%;accent-color:var(--fg);height:30px;margin:0}
.sl{display:grid;gap:0}
.sl .top{display:flex;justify-content:space-between;gap:12px;align-items:baseline}
.sl label{font-size:13px;font-weight:500}
.sl output{font:500 15px "IBM Plex Mono",monospace;white-space:nowrap}
.sl p{font-size:15.5px;line-height:1.4;color:var(--muted)}
.sliders{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px 24px}
.outcome{display:grid;gap:6px}
.pill{justify-self:start;font:500 13px "IBM Plex Mono",monospace;letter-spacing:.06em;padding:3px 9px;border-radius:3px;background:var(--fg);color:var(--bg)}
.pill.runaway{background:var(--b);color:var(--on)}
.pill.fizzle{background:transparent;color:var(--fg);box-shadow:inset 0 0 0 1px var(--line)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:12px 20px}
.stat b{display:block;font:500 30px/1.1 "IBM Plex Mono",monospace;font-variant-numeric:tabular-nums}
.stat span{font-size:14.5px;line-height:1.3;color:var(--muted);display:block}
.chartwrap{position:relative;min-width:0}
svg{display:block;width:100%;height:auto;overflow:visible}
svg text{font:11.5px "IBM Plex Mono",monospace;fill:var(--muted)}
svg text.strong{fill:var(--fg);font-weight:500}
.tip{position:absolute;pointer-events:none;background:var(--bg);border:1px solid var(--faint);border-radius:4px;padding:6px 9px;font:12.5px/1.45 "IBM Plex Mono",monospace;white-space:nowrap;z-index:2}
.tip b{font-weight:500}
.key{display:flex;flex-wrap:wrap;gap:6px 16px;font:12.5px "IBM Plex Mono",monospace}
.key i{display:inline-block;width:18px;height:0;border-top:2px solid;margin-right:6px;vertical-align:4px}
.key i.sq{width:11px;height:11px;border:0;vertical-align:-1px}
.rng{display:grid;gap:3px}
.rng .t{font-size:16px;line-height:1.35}
.rng .track{position:relative;height:18px;border-bottom:1px solid var(--faint)}
.rng .span{position:absolute;top:7px;height:4px;background:var(--b);border-radius:2px}
.rng .span.light{opacity:.5}
.rng .dot{position:absolute;top:3px;width:12px;height:12px;margin-left:-6px;background:var(--b);border-radius:50%;box-shadow:0 0 0 2px var(--panel)}
.axis{position:relative;height:18px;font:11.5px "IBM Plex Mono",monospace;color:var(--muted)}
.axis span{position:absolute;transform:translateX(-50%)}
.axis span:first-child{transform:none}.axis span:last-child{transform:translateX(-100%)}
.tl{display:grid;gap:6px}
.tl .row{display:grid;gap:1px}
.tl .row>span{font:12.5px/1.3 "IBM Plex Mono",monospace}
.tl .bar{position:relative;height:12px;background:var(--bg);border-radius:2px}
.tl .bar i{position:absolute;top:0;bottom:0;border-radius:2px}
.share{height:14px;background:var(--bg);border-radius:0 4px 4px 0}
.share i{display:block;height:100%;background:var(--b);border-radius:0 4px 4px 0}
ul.plain{margin:0;padding-left:20px;display:grid;gap:6px;max-width:66ch}
details{font-size:16.5px}
summary{cursor:pointer;font:13px "IBM Plex Mono",monospace;color:var(--muted);min-height:28px}
details>*:not(summary){margin-top:10px}
.scroll{overflow-x:auto;min-width:0}
table{border-collapse:collapse;font:12.5px "IBM Plex Mono",monospace;width:100%;font-variant-numeric:tabular-nums}
td,th{padding:3px 8px;text-align:right;border-bottom:1px solid var(--faint)}
.labels{display:grid;grid-template-columns:max-content 1fr;gap:4px 12px;margin:0;font-size:16px;line-height:1.35}
.labels dd{margin:0;min-width:0}
footer{font-size:15px;color:var(--muted);display:grid;gap:8px;border-top:1px solid var(--faint);padding-top:16px}
@media (prefers-reduced-motion:reduce){.flow{display:none}}

/* site frame */
.site{max-width:760px;margin:0 auto 34px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px 16px;font:12.5px "IBM Plex Mono",ui-monospace,Menlo,monospace}
.site a{color:var(--muted);text-decoration:none}.site a:hover{color:var(--fg);text-decoration:underline}
.path{max-width:760px;margin:0 auto 26px;display:grid;grid-template-columns:repeat(7,1fr);gap:4px}
.path a{height:6px;border-radius:2px;background:var(--faint);display:block}
.path a.done{background:var(--line)}.path a.here{background:var(--fg)}
.path a:focus-visible{outline:2px solid var(--a);outline-offset:2px}
.nextprev{max-width:760px;margin:44px auto 0;display:grid;grid-template-columns:1fr 1fr;gap:12px}
.nextprev a{display:grid;gap:2px;padding:14px;background:var(--panel);border-radius:6px;text-decoration:none;color:var(--fg);font-size:17px;line-height:1.25}
.nextprev a span{font:11.5px "IBM Plex Mono",monospace;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.nextprev a.next{grid-column:2;text-align:right}