/* How Fast Are We Moving? Original School Launch styles (same palette as Quantum Explorer and the Breadboard Lab). */
:root{
  --ink:#2a211b; --muted:#6b5d52; --paper:#f7f2e8; --card:#fffdf8; --line:#e2d7c5; --brick:#8c3b22; --brick-dk:#6e2c18;
  --focus:#1f5f8b; --night:#15100c;
  font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--paper);color:var(--ink)}
body{line-height:1.5;font-size:16px;overflow-x:hidden}
.app{max-width:1280px;margin:0 auto;padding:12px 16px 32px}
a{color:var(--brick)}
:focus-visible{outline:3px solid var(--focus);outline-offset:2px}
[hidden]{display:none!important}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.5rem .8rem;z-index:30}
.skip:focus{left:.5rem;top:.5rem}
.noscript{padding:12px 16px;background:var(--card);border:1px solid var(--line);border-radius:8px}
.top h1{margin:4px 0 0;font-size:28px;color:var(--brick);letter-spacing:.01em;font-family:Georgia,"Times New Roman",serif}
.top .sub{margin:2px 0 10px;color:var(--muted)}
.tabs{display:flex;flex-wrap:wrap;gap:6px;border-bottom:2px solid var(--line);margin-bottom:12px}
.tabs button{font:inherit;font-size:15px;font-weight:600;border:1px solid var(--line);border-bottom:0;background:#efe6d6;color:var(--ink);border-radius:8px 8px 0 0;padding:8px 14px;cursor:pointer;min-height:42px;margin-bottom:-2px}
.tabs button[aria-selected="true"]{background:var(--card);color:var(--brick);border-color:var(--brick);border-bottom:2px solid var(--card)}
.tabs button:hover{background:#f8efe2}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 380px;gap:18px;align-items:start}
.stage{min-width:0}
.stage canvas{display:block;width:100%;height:auto;background:var(--night);border-radius:8px;border:1px solid #3a2c22;touch-action:none}
#claCanvas{max-width:680px;margin:0 auto}
.caption{margin:6px 2px 0;font-size:14px;color:var(--muted);min-height:1.5em}
.side{display:flex;flex-direction:column;gap:12px;min-width:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:10px 14px}
.card h2{margin:0 0 8px;font-size:18px;color:var(--brick-dk)}
.card h3{margin:14px 0 4px;font-size:16px;color:var(--brick-dk)}
.row{display:flex;align-items:center;gap:8px;margin:6px 0}
.row label{flex:0 0 66px;font-weight:600;font-size:14px}
select{font:inherit;font-size:15px;flex:1;min-width:0;border:1px solid var(--muted);border-radius:6px;padding:5px 6px;background:#fff;color:var(--ink);min-height:36px}
.seg{display:flex;flex-wrap:wrap;gap:4px 12px;margin:0 0 6px;font-size:14.5px}
.seg label,.check{display:flex;align-items:center;gap:6px;cursor:pointer;min-height:30px;font-size:14.5px}
input[type=radio],input[type=checkbox]{width:17px;height:17px;accent-color:var(--brick);margin:0}
input[type=range]{width:100%;accent-color:var(--brick);min-height:28px}
.slider{margin:6px 0}
.slider label{display:flex;justify-content:space-between;font-weight:600;font-size:14px}
.slider output{font-weight:700;color:var(--brick);font-variant-numeric:tabular-nums}
.slider.wide{margin:10px 2px 0}
.btns{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:8px}
.btns .inline{font-size:14px;font-weight:600}
.btns input[type=range]{flex:1;width:auto}
.btn{font:inherit;font-size:15px;border:1px solid var(--muted);background:#fff;color:var(--ink);border-radius:6px;padding:6px 14px;cursor:pointer;min-height:38px}
.btn:hover{background:#f3ebdd}
.btn.primary{background:var(--brick);border-color:var(--brick);color:#fff;font-weight:600}
.btn.primary:hover{background:var(--brick-dk)}
.presets{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin-top:10px;font-size:14px}
.presets span{font-weight:600;color:var(--muted)}
.chip{font:inherit;font-size:14px;border:1px solid var(--line);background:#fff;border-radius:999px;padding:3px 10px;cursor:pointer;min-height:32px}
.chip:hover{border-color:var(--brick)}
.readout{font-size:14.5px;font-variant-numeric:tabular-nums}
.readout dl{display:grid;grid-template-columns:auto 1fr;gap:3px 12px;margin:0}
.readout dt{color:var(--muted)}
.readout dd{margin:0;font-weight:600;text-align:right}
.readout .big{font-size:22px;color:var(--brick)}
.readout .note{margin:8px 0 0;font-size:13.5px;color:var(--muted)}
.bar{display:flex;height:14px;border-radius:4px;overflow:hidden;border:1px solid var(--line);margin:8px 0 2px}
.bar span{display:block;height:100%}
.swatch{display:inline-block;width:12px;height:12px;border-radius:2px;margin-right:5px;vertical-align:-1px;border:1px solid #0003}
.notes summary{font-weight:700;color:var(--brick-dk);cursor:pointer}
.notes p{margin:8px 0;font-size:15px}
.small{font-size:13.5px;color:var(--muted)}
.levbtns{display:flex;flex-wrap:wrap;gap:6px;margin:4px 0}
.levbtns .btn{min-width:54px;padding:6px 8px}
.levbtns .btn[aria-pressed="true"]{background:var(--brick);border-color:var(--brick);color:#fff}
.lines{margin:0;padding-left:22px;font-size:14px;max-height:220px;overflow:auto;font-variant-numeric:tabular-nums}
.lines li{margin:2px 0}
.lines .sw{display:inline-block;width:12px;height:12px;border-radius:2px;vertical-align:-1px;margin-right:4px;border:1px solid #0003}
.lines:empty::before{content:"None yet.";color:var(--muted);margin-left:-22px}
/* explainer level */
.levelbar{display:flex;flex-wrap:wrap;align-items:center;gap:4px 12px;margin:-4px 0 10px;font-size:14.5px}
.levelbar>span{font-weight:600;color:var(--muted)}
.levelbar .seg{margin:0}
.notes-row{display:flex;flex-wrap:wrap;gap:6px;align-items:center;margin:4px 0;font-size:14px}
.notes-row span{font-weight:600;color:var(--muted)}
.chip[aria-pressed="true"]{background:var(--brick);border-color:var(--brick);color:#fff}
.btn[aria-pressed="true"].on{background:#f3ebdd}
.formula{font-family:Georgia,"Times New Roman",serif;font-size:17px;text-align:center;margin:4px 0!important}
.ex{margin:6px 0;padding-left:20px;font-size:15px}.ex li{margin:0 0 6px}
.reveal{margin:4px 0 0}.reveal summary{cursor:pointer;color:var(--brick);font-weight:600;font-size:14px}
.reveal p{background:#f6efe2;border-radius:4px;padding:6px 8px}
.guidecols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;align-items:start}
.guide p,.guide li{font-size:15px}
.qs li{margin:0 0 8px}
.aside{background:#f6efe2;border-left:4px solid var(--brick);padding:8px 10px;border-radius:4px;font-size:14.5px}
.foot{margin-top:18px;font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:8px}
@media (max-width:1100px){.guidecols{grid-template-columns:1fr 1fr}.guidecols article:last-child{grid-column:1/-1}}
@media (max-width:900px){.layout{grid-template-columns:1fr}.guidecols{grid-template-columns:1fr}}
@media (max-width:560px){.app{padding:8px 10px 24px}.top h1{font-size:23px}.tabs button{font-size:14px;padding:6px 10px}}
@media print{.tabs,.stage,.side,.skip{display:none!important}.panel[hidden]{display:block!important}.panel:not(.guide){display:none!important}.guidecols{display:block}}
/* how-fast-moving additions */
#spinCanvas{max-width:640px;margin:0 auto;cursor:ns-resize}
.hbars{display:flex;flex-direction:column;gap:6px;font-size:14px}
.hbar{display:grid;grid-template-columns:150px 1fr;gap:8px;align-items:center}
.hbar .track{height:14px;background:#efe6d6;border-radius:4px;overflow:hidden;border:1px solid var(--line)}
.hbar .fill{display:block;height:100%;background:#b88a5a}
.hbar.you .fill{background:var(--brick)}
.hbar.you b{color:var(--brick)}
.hbar small{color:var(--muted);font-variant-numeric:tabular-nums}
@media (max-width:560px){.hbar{grid-template-columns:118px 1fr}}

/* Site header and footer (School Launch nav and footer link row, as on every inner page). Own --sl- variables so the
   explorer's palette above is untouched; values from courses/shared/course.css. Not sticky here, to keep the canvas in view. */
.site-head,.site-foot{--sl-ground:#F5F0E6;--sl-ink:#1F1B16;--sl-muted:#5A5247;--sl-line:#D9CFBC;--sl-linen:#EDE4D3;--sl-forge:#8C3A1F;--sl-brass:#B08A3E;--sl-paper:#FFFDF8;
  --ground:var(--sl-ground);--ink:var(--sl-ink);--forge:var(--sl-forge);--brass:var(--sl-brass);--paper:var(--sl-paper);
  font-family:'Source Sans 3','Segoe UI',system-ui,-apple-system,sans-serif;color:var(--sl-ink);line-height:1.55}
.site-head .wrap,.site-foot .wrap{max-width:1120px;margin:0 auto;padding-inline:20px}
.site-head{background:var(--sl-ground);border-bottom:1px solid var(--sl-line)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:16px;padding-block:12px;flex-wrap:wrap}
.site-head .brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--sl-ink)}
.site-head .brand span{font-family:'Cinzel','Trajan Pro',Georgia,serif;font-weight:700;font-size:22px;color:var(--sl-forge);letter-spacing:.03em}
.site-head .nav{display:flex;gap:4px;flex-wrap:wrap}
.site-head .nav a{text-decoration:none;color:var(--sl-ink);font-weight:600;font-size:15px;padding:8px 12px;border-radius:6px}
.site-head .nav a:hover{background:var(--sl-linen)}
.site-foot{border-top:1px solid var(--sl-line);padding-block:28px;background:var(--sl-ground);font-size:17px}
.site-foot a{color:var(--sl-forge)}
.site-foot .wrap{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;align-items:baseline}
.site-foot .eyebrow{font-size:13px;letter-spacing:.14em;text-transform:uppercase;font-weight:700;color:var(--sl-muted)}
.site-foot .muted{color:var(--sl-muted)}
.site-foot p{margin:0}
.site-foot .foot-links{display:flex;flex-wrap:wrap;gap:4px 18px;margin:0 0 10px;padding:0;list-style:none;font-size:15px;font-weight:600}
.site-foot .foot-links a{text-decoration:none}
.site-foot .foot-links a:hover{text-decoration:underline}
.site-foot .foot-base{margin-top:24px;padding-top:20px;border-top:1px solid var(--sl-line)}
.site-foot .motto{font-family:'Source Serif 4',Georgia,'Times New Roman',serif;font-style:italic}
.site-foot .network{display:flex;flex-direction:column;gap:12px;width:100%}
.site-foot .network h2{margin:0}
.site-foot .network-list{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
.site-foot .network-list li{display:flex;flex-direction:column;gap:2px;font-size:15px}
.site-foot .network-list a{font-family:'Source Serif 4',Georgia,'Times New Roman',serif;font-weight:600;font-size:18px}
.site-foot .network-list span{color:var(--sl-muted)}
.site-foot .sl-foot-line{font-size:15px}
.site-foot .sl-foot-legal{font-size:13px;margin-top:6px}
@media (max-width:700px){.site-foot .network-list{grid-template-columns:minmax(0,1fr);gap:12px}}
@media print{.site-head,.site-foot{display:none!important}}
.slider .sl-row{display:flex;justify-content:space-between;align-items:baseline;gap:8px;font-weight:600;font-size:14px}