/* GROK'it · Under the Hood (candidate). Extends grokit.css; adds only layout for the page and the read-only NOW window. Low scroll: one lead, everything else on tap. */
.wrap.hood{max-width:1040px}
.hood-grid{display:grid;grid-template-columns:1fr;gap:0 28px;grid-template-areas:"lead" "now" "depth"}
.hood-grid .lead{grid-area:lead;min-width:0}.hood-grid .nowwin{grid-area:now}.hood-grid .depth{grid-area:depth;min-width:0}
.kick{margin:18px 0 0;font:600 12px var(--mono);letter-spacing:.06em;color:var(--dim)}
.hood h1{font-size:clamp(24px,6.2vw,38px);margin:8px 0 8px}
@media(max-width:899px){.hood .lede{font-size:15px;margin-bottom:8px}.hood .lead>p:not(.kick):not(.lede):not(.cta-row){font-size:15px;margin-bottom:8px}}
.cta-row{margin:14px 0 6px}.cta-row .cta{font-size:15px;padding:10px 20px}
.nowwin{border:1px solid var(--line);background:var(--card);border-radius:12px;padding:10px 14px;margin:14px 0 0;font-size:14px;align-self:start}
.nowwin h2{margin:0 0 4px}.nowwin h2 small{margin:0}.nowwin dl{margin:0}.nowwin dt{margin-top:8px}.nowwin dd{color:var(--dim);margin:0}.nowwin .st{font:600 11px var(--mono);color:var(--frog)}
details.hd{border-top:1px solid var(--line);margin:0}details.hd:last-of-type{border-bottom:1px solid var(--line)}
details.hd>summary{cursor:pointer;list-style:none;padding:13px 0;font:600 13px var(--mono);letter-spacing:.08em;text-transform:uppercase;color:var(--frog);min-height:44px;display:flex;align-items:center;gap:10px}
details.hd>summary::-webkit-details-marker{display:none}details.hd>summary::before{content:"+";display:inline-grid;place-items:center;width:22px;height:22px;border:1px solid var(--line);border-radius:50%;color:var(--sky)}
details.hd[open]>summary::before{content:"−"}details.hd.in{margin-top:10px}
pre.src{max-height:420px;overflow:auto;white-space:pre;tab-size:2;font-size:12px;line-height:1.45}
ol.tests{padding-left:20px;font-size:14px}ol.tests li{margin:6px 0}ul.lim{padding-left:20px}ul.lim li{margin:6px 0}
.back{margin:18px 0 6px}
@media(min-width:900px){.hood-grid{grid-template-columns:minmax(0,1fr) 300px;grid-template-areas:"lead now" "depth now";grid-template-rows:auto 1fr}.hood-grid .nowwin{position:sticky;top:64px;margin-top:22px}}
.hood p code,.hood li code,.hood dd code{overflow-wrap:anywhere;word-break:break-word}

/* ── Progressive depth (pure CSS; this page has no script): side rail, edge rail, memory bars, three depths ── */
html{scroll-behavior:smooth;scroll-padding-top:60px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.sec{margin:26px 0 0;scroll-margin-top:60px}
.sh{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:6px 18px;border-top:1px solid var(--line);padding-top:12px}
.sh h2{margin:0;font:700 15px var(--mono);letter-spacing:.1em;text-transform:uppercase;color:var(--ink)}
.dist{margin:6px 0 4px;color:var(--ink);font-size:17px}
/* local memory bar: YOU ARE HERE / CAME BEFORE / COMES NEXT */
.mem{display:flex;flex-wrap:wrap;gap:2px 16px;font:500 11px/1.5 var(--mono);color:var(--faint)}
.mem p{margin:0;display:flex;gap:6px;align-items:baseline}.mem b{font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);font-size:10px}
.mem span{color:var(--dim)}.mem a{color:var(--sky);text-decoration:none}.mem a:hover{text-decoration:underline}
/* three depths: the answer (always), + explanation, + sources · math · code · tests */
details.d1>summary,details.d2>summary{min-height:44px}
details.d1[open]>summary,details.d2[open]>summary{position:sticky;background:var(--bg);z-index:3}
details.d1[open]>summary{top:48px}
details.d2[open]>summary{top:92px;z-index:2}
details.d1>*:not(summary){margin-left:0}
details.d2{margin:10px 0 0;border-left:2px solid var(--r2);padding-left:12px;border-top:0}
details.d2:last-of-type{border-bottom:0}
details.d2>summary{color:var(--sky);font-size:12px}
/* side rail (wide screens): sticky, quiet, shows where you are */
.rail{display:none!important}
.rail ol,.edge nav ol{list-style:none;margin:0;padding:0}
.rail a,.edge nav a{display:block;padding:7px 0 7px 12px;border-left:2px solid var(--line);color:var(--faint);text-decoration:none;font:500 12px/1.3 var(--mono);letter-spacing:.04em}
.rail a:hover,.edge nav a:hover{color:var(--ink);border-left-color:var(--frog)}
/* edge rail (small and medium screens): a slim bar with a progress marker; tap it for the sections */
.edge{position:fixed;left:0;top:0;bottom:0;z-index:20;width:0}
.edge>summary{list-style:none;position:fixed;left:0;top:0;bottom:0;width:30px;cursor:pointer;display:block}
.edge>summary::-webkit-details-marker{display:none}
.edge .bar{position:absolute;left:0;top:12px;bottom:12px;width:4px;background:var(--line);border-radius:0 3px 3px 0}
.edge .mark{position:absolute;left:0;top:0;width:4px;height:36px;background:var(--frog);border-radius:0 3px 3px 0}
.edge[open]>summary{width:100vw;background:rgba(0,0,0,.4)}
.edge nav,.rail{display:block;height:auto;margin:0;gap:0;align-items:stretch;justify-content:flex-start;padding:0;border:0;background:none}
.edge nav{z-index:21;position:fixed;left:14px;top:50%;transform:translateY(-50%);width:min(240px,calc(100vw - 24px));max-height:80vh;overflow:auto;background:var(--d2);border:1px solid var(--r2);border-radius:var(--r-sys);padding:8px 10px 8px 6px;box-shadow:0 8px 30px rgba(0,0,0,.6)}
.edge:not([open]) nav{display:none}
@supports (animation-timeline:scroll()){
  .edge .mark{animation:edgeprog linear both;animation-timeline:scroll(root)}
  @keyframes edgeprog{from{top:0}to{top:calc(100% - 36px)}}
}
@media (min-width:1100px){
  .wrap.hood{max-width:1280px}
  .edge{display:none}
  .hood-grid{grid-template-columns:150px minmax(0,1fr) 300px;grid-template-areas:"rail lead now" "rail depth now";gap:0 32px}
  .rail{display:block!important;grid-area:rail;position:sticky;top:64px;align-self:start;margin-top:26px}
}
@supports (animation-timeline:view()){
  @media (min-width:1100px){
    body{timeline-scope:--t-lead,--t-calc,--t-code,--t-tests,--t-limits,--t-privacy,--t-record}
    #s-lead{view-timeline:--t-lead block}#s-calc{view-timeline:--t-calc block}#s-code{view-timeline:--t-code block}#s-tests{view-timeline:--t-tests block}#s-limits{view-timeline:--t-limits block}#s-privacy{view-timeline:--t-privacy block}#s-record{view-timeline:--t-record block}
    .rail a{animation:railhere linear both}
    .rail a[href="#s-lead"]{animation-timeline:--t-lead}.rail a[href="#s-calc"]{animation-timeline:--t-calc}.rail a[href="#s-code"]{animation-timeline:--t-code}.rail a[href="#s-tests"]{animation-timeline:--t-tests}.rail a[href="#s-limits"]{animation-timeline:--t-limits}.rail a[href="#s-privacy"]{animation-timeline:--t-privacy}.rail a[href="#s-record"]{animation-timeline:--t-record}
    @keyframes railhere{0%,100%{color:var(--faint);border-left-color:var(--line)}30%,70%{color:var(--frog);border-left-color:var(--frog)}}
  }
}