@font-face{font-family:"Atkinson Hyperlegible";font-weight:400;font-style:normal;font-display:swap;src:url(../fonts/atkinson-hyperlegible-latin-400-normal.woff2) format("woff2")}
@font-face{font-family:"Atkinson Hyperlegible";font-weight:700;font-style:normal;font-display:swap;src:url(../fonts/atkinson-hyperlegible-latin-700-normal.woff2) format("woff2")}
@font-face{font-family:"Barlow Condensed";font-weight:500;font-style:normal;font-display:swap;src:url(../fonts/barlow-condensed-latin-500-normal.woff2) format("woff2")}
@font-face{font-family:"Barlow Condensed";font-weight:600;font-style:normal;font-display:swap;src:url(../fonts/barlow-condensed-latin-600-normal.woff2) format("woff2")}
:root{
  --bg:#EDF0F2;--panel:#FFFFFF;--ink:#18232E;--muted:#56636F;--line:#CBD3DA;
  --amber:#B8730F;--amber-bg:#FBF0DD;--ok:#22744A;--ok-bg:#E2F2E8;--bad:#A93434;--bad-bg:#F8E3E3;
  --none:#B9C2CA;--bronze:#8C6A4E;--silver:#4A80A8;--gold:#C8930E;
  color-scheme:light;box-sizing:border-box;
  padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px);
}
@media (prefers-color-scheme: dark){:root{
  --bg:#11171D;--panel:#1A222A;--ink:#E3E8ED;--muted:#9AA7B3;--line:#2D3842;
  --amber:#E9A33E;--amber-bg:#33270F;--ok:#5CC48A;--ok-bg:#163223;--bad:#EE7B7B;--bad-bg:#3A1B1B;
  --none:#4A5661;--bronze:#B39070;--silver:#7FB6E0;--gold:#EBC04E;
  color-scheme:dark}}
html{scroll-padding-top:env(safe-area-inset-top,0px)}
*,*::before,*::after{box-sizing:inherit}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Atkinson Hyperlegible",system-ui,"Segoe UI",Roboto,sans-serif;font-size:17px;line-height:1.55;-webkit-tap-highlight-color:transparent}
main{max-width:640px;margin:0 auto;padding:16px 16px 48px}
h1{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:34px;line-height:1.05;margin:4px 0 6px;letter-spacing:.01em}
.sub{color:var(--muted);margin:0 0 8px;font-size:15px}
.over{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:500;font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:var(--amber);margin:14px 0 0}
.back{font:inherit;font-size:15px;background:none;border:0;padding:6px 0;margin:0 0 4px;color:var(--muted);cursor:pointer}
/* home */
.today{display:flex;align-items:baseline;gap:12px;margin:6px 0 4px}
.today b{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:72px;line-height:.9;color:var(--amber)}
.today span{font-size:17px}
.reach{color:var(--muted);font-size:15px;margin:0 0 14px}
.plan{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:12px 14px;margin:0 0 14px;font-size:15px}
.actions+.plan{margin-top:16px}
.plan p{margin:0}.plan p+p{margin-top:6px}
.plan b{font-weight:700}
.plan .pass b{color:var(--ok)}.plan .short b{color:var(--bad)}
.plan .muted{color:var(--muted);font-size:14px}
.plan a,.plan .linkbtn{color:var(--muted);font-size:14px}
.plan .set{display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;margin-top:8px}
.plan input[type=date]{font:inherit;font-size:15px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:6px 8px;color-scheme:inherit}
.plan .links{display:flex;flex-wrap:wrap;gap:4px 14px;margin-top:8px}
.plan p>a+.linkbtn,.plan p>.linkbtn+a{margin-left:12px}
.decks{list-style:none;margin:18px 0 0;padding:0;border-top:1px solid var(--line)}
.decks li{border-bottom:1px solid var(--line)}
.row{font:inherit;color:inherit;background:none;border:0;width:100%;text-align:left;display:grid;grid-template-columns:104px 1fr auto;gap:2px 10px;align-items:center;padding:12px 2px;cursor:pointer}
.row .code{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:500;font-size:34px;line-height:1;color:var(--amber);grid-row:span 2}
.row .nm{font-weight:700;font-size:17px;line-height:1.25}
.row .meta{font-size:14px;color:var(--muted);grid-column:2}
.row .due{grid-row:span 2;grid-column:3;font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:26px;line-height:1;text-align:right;min-width:44px}
.row .due small{display:block;font-family:"Atkinson Hyperlegible",system-ui,sans-serif;font-weight:400;font-size:12px;color:var(--muted)}
.row .due.zero{color:var(--line)}
.meter{grid-column:2/4;height:4px;border-radius:2px;background:var(--line);overflow:hidden;display:flex;margin-top:6px}
.meter i{display:block;height:100%}
.meter .m{background:var(--ok)}.meter .s{background:var(--amber)}
.untouched .code{color:var(--muted)}
.row .code{display:flex;align-items:center;gap:5px}
.row .code.long{font-size:28px}
.row.badged .code{color:var(--muted)}
/* badges: a tower broadcasting one, two or three pairs of waves from the antenna tip for bronze, silver, gold */
.badge{display:block;flex:none}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.badge .ring{fill:var(--panel);stroke:currentColor;stroke-width:3}
.badge.t0{color:var(--none)}.badge.t0 .ring{stroke-dasharray:4 3}.badge.t0 .tw{stroke-dasharray:3 2.5}
.badge.t1{color:var(--bronze)}.badge.t2{color:var(--silver)}.badge.t3{color:var(--gold)}
.badge.lapsed{opacity:.45}
.sashbox{margin:22px 0 0;padding:14px 8px 10px;background:var(--panel);border:1px solid var(--line);border-radius:12px}
.sash{list-style:none;display:grid;grid-template-columns:repeat(6,1fr);gap:10px 4px;margin:0;padding:0}
.sash.seven{grid-template-columns:repeat(7,1fr)}
.sash li{text-align:center}
.sash .badge{margin:0 auto}
.sash b{display:block;font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:17px;line-height:1.2;margin-top:3px}
.sash .lapsed+b{color:var(--muted)}
.sash-cap{font-size:14px;color:var(--muted);margin:10px 6px 0;text-align:center}
/* the week: seven dots, Monday to Sunday; filled when studied, dashed for a day off, a heavy ring for today */
.week{margin:16px 0 0;padding:12px 0 0;border-top:1px solid var(--line)}
.week+.plan{margin-top:14px}
.days{list-style:none;display:flex;justify-content:space-between;gap:4px;margin:0 0 6px;padding:0}
.d{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:13px;letter-spacing:.04em;color:var(--muted)}
.d i{display:block;width:30px;height:30px;border-radius:50%;border:2px solid var(--none);position:relative}
.d.done i{background:var(--amber);border-color:var(--amber)}
.d.done i::after,.d.bonus i::after{content:"";position:absolute;left:9px;top:5px;width:7px;height:13px;border:solid var(--bg);border-width:0 3px 3px 0;transform:rotate(45deg)}
.d.off i{border-style:dashed;border-color:var(--muted)}
.d.off i::after{content:"";position:absolute;left:8px;top:12px;width:10px;height:2px;background:var(--muted)}
.d.now i{border-color:var(--ink);border-width:3px}
.d.now{color:var(--ink)}
.d.bonus i{background:var(--ok-bg);border-color:var(--ok)}
.d.bonus i::after{border-color:var(--ok)}
.wl{margin:0;font-size:15px}
.wl .ok{color:var(--ok);font-weight:700}
.wl small{display:block;color:var(--muted);font-size:14px}
.section-gap{margin-top:8px}
/* drill */
.groups{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:12px}
.chip{font:inherit;font-size:15px;border:1px solid var(--line);background:var(--panel);color:var(--ink);padding:7px 12px;border-radius:999px;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.opts{display:flex;flex-wrap:wrap;gap:10px 16px;font-size:15px;color:var(--muted);margin-bottom:14px}
.opts label{display:flex;align-items:center;gap:6px;cursor:pointer}
.opts input{width:18px;height:18px;accent-color:var(--amber)}
.srs{font-size:15px;margin:0 0 10px}
.status{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:2px 8px;font-size:15px;color:var(--muted);margin-bottom:6px}
.bar{height:4px;background:var(--line);border-radius:2px;overflow:hidden;margin-bottom:16px}
.bar span{display:block;height:100%;background:var(--amber);width:0;transition:width .25s}
.card{scroll-margin-top:12px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:18px 18px 20px}
.qid{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:17px;letter-spacing:.04em;color:var(--amber);margin-right:6px}
.topic{font-size:14px;color:var(--muted);margin:0 0 12px}.rep{color:var(--amber);font-weight:600}.topic.rep{margin-bottom:6px}
.fig{background:var(--amber-bg);border-radius:8px;padding:8px 12px;font-size:15px;margin:0 0 12px}
.figbox{margin:0 0 14px;padding:10px 12px 6px;border:1px solid var(--line);border-radius:10px;background:var(--panel)}
.figbox svg{display:block;width:100%;height:auto;max-height:240px;margin:0 auto}
.fln{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.fnum{font-family:"Atkinson Hyperlegible",system-ui,sans-serif;font-weight:700;font-size:15px;fill:currentColor;text-anchor:middle}
.figbox svg.wide .fnum{font-size:21px}
.figbox figcaption{font-size:13px;color:var(--muted);margin:6px 0 0}
.figs{display:grid;gap:14px;margin:12px 0 0}
.q{font-size:21px;font-weight:700;line-height:1.35;margin:0 0 16px}
.ans{display:flex;flex-direction:column;gap:8px}
.ans button{font:inherit;text-align:left;display:flex;gap:10px;align-items:flex-start;width:100%;background:transparent;color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:11px 12px;cursor:pointer}
.ans button b{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:19px;min-width:16px;line-height:1.35}
.ans button:disabled{cursor:default}
.ans button.right{background:var(--ok-bg);border-color:var(--ok)}
.ans button.wrong{background:var(--bad-bg);border-color:var(--bad)}
.note{margin:14px 0 0;padding-top:12px;border-top:1px solid var(--line);font-size:16px}
.note strong.ok{color:var(--ok)}.note strong.no{color:var(--bad)}
.actions{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.btn{font:inherit;font-weight:700;border-radius:10px;padding:11px 18px;cursor:pointer;border:1px solid var(--ink);background:var(--ink);color:var(--bg)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line)}
.explain{margin-top:14px;border-left:3px solid var(--amber);padding:2px 0 2px 14px}
.explain p{margin:0 0 10px;font-size:16px}
.explain details{margin-top:6px;font-size:15px}
.explain summary{cursor:pointer;color:var(--muted)}
.explain details p{font-size:15px;margin:8px 0 0}
.fx{background:var(--amber-bg);border-radius:10px;padding:10px 14px;margin:12px 0 0}
.fx .eq{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:26px;margin:0}
.fx .leg{margin:6px 0 0;padding-left:18px;font-size:15px}.fx .leg li{margin:2px 0}
.cheat{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 14px;margin:0 0 16px;font-size:15px}
.cheat summary{cursor:pointer;font-weight:700}.cheat p{margin:8px 0 0}
.cheat svg{display:block;width:100%;height:auto;margin:10px 0 2px}
.study h2{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:28px;line-height:1.1;color:var(--amber);margin:26px 0 6px}
.study h2:first-of-type{margin-top:10px}
.study .cover{font-size:14px;color:var(--muted);margin:4px 0 0}
.study .cover a{color:inherit}
.study .cover b{font-weight:400;color:var(--ink)}
.study .sec{margin:34px 0 0;padding-top:18px;border-top:1px solid var(--line)}
.study .sec:first-of-type{margin-top:0;padding-top:0;border-top:0}
.study .sec h1{margin-top:0}
.study .gallery{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:12px}
.study .gallery div{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px 12px;font-size:14px}
.study .gallery svg{width:100%;height:auto;color:var(--ink);display:block;margin-bottom:4px}
.study .gallery b{display:block;font-size:16px}
.study .gallery p{margin:4px 0 0;color:var(--muted)}
.study .cards{grid-template-columns:1fr}.study .cards .bandbar{display:block;width:100%;height:auto;margin:2px 0 6px}
.study .cheat{margin-top:12px}
.study .cheat summary{display:none}
.study .cheat p{margin:0 0 8px}
.study .cheat p:first-of-type{margin-top:0}
.tools{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:15px;margin:0 0 14px}
.tools a,.tools .linkbtn{font-size:15px;color:var(--muted)}
.study-link{display:block;font-size:14px;color:var(--muted);padding:0 2px 12px 104px;margin-top:-6px}
.study-link a{color:inherit}
.only{font-size:15px;color:var(--muted);margin:0 0 14px}
.only a{color:inherit}
@media print{
  body{background:#fff;color:#000;font-size:12pt}
  .back,.tools,.actions,.btn,.linkbtn,.foot,.toast,.demobar,.week{display:none!important}
  .study .cover a{text-decoration:none}
  .study .sec{break-before:page;border-top:0;margin-top:0;padding-top:0}
  .study .sec:first-of-type{break-before:auto}
  .study h2{break-after:avoid}.study .gallery div,.study .primer p{break-inside:avoid}
  .study .cover a{display:none}
  .study .cheat,.study .gallery div{border-color:#999}
  a[href]::after{content:none}
}
.ptitle{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:32px;line-height:1.1;color:var(--amber);margin:0 0 8px}
.primer p{margin:0 0 10px}
.end h2{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:56px;line-height:1;margin:0;color:var(--amber)}
.end p{margin:6px 0 0}
/* group chips carry how many of the group's cards were missed at their last answer */
.chip small{font-size:12px;font-weight:700;margin-left:5px;color:var(--bad)}
.chip[aria-pressed="true"] small{color:inherit}
/* practice exam: a continuous scroll; the current card pops out, the others fade and shrink a touch.
   Faded text stays above 4.5:1 on the panel, so every card can still be read. */
.exam{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.exam .card{opacity:.7;transform:scale(.97);transition:opacity .2s,transform .2s,box-shadow .2s}
.exam .card:not(.cur){cursor:pointer}
.exam .card:not(.cur) .topic{color:var(--ink)}
.exam .card.cur{opacity:1;transform:none;border-color:var(--amber);box-shadow:0 8px 28px rgba(0,0,0,.2)}
.exam .q{font-size:19px}
.exam .ans button.picked{background:var(--amber-bg);border-color:var(--amber)}
.secs{list-style:none;margin:14px 0 0;padding:0;border-top:1px solid var(--line)}
.secs li{display:flex;gap:10px;align-items:baseline;padding:6px 0;border-bottom:1px solid var(--line);font-size:15px}
.secs b{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:19px;color:var(--amber);min-width:44px}
.secs .nm{flex:1}.secs .n.short{color:var(--bad)}
.misshead{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:28px;line-height:1.1;color:var(--amber);margin:26px 0 10px}
.miss{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:14px 16px;margin:0 0 12px}
.miss .q{font-size:17px;margin:0 0 8px}
.miss .given{margin:0 0 6px;font-size:15px;color:var(--muted)}
.miss .note{margin:0;padding:0;border:0}
/* symbols */
.prompt{font-size:15px;color:var(--muted);margin:0 0 6px}
.name{font-size:22px;font-weight:700;margin:0 0 14px}
.big{display:flex;justify-content:center;margin:6px 0 16px}
.big svg{width:min(100%,260px);height:auto;color:var(--ink)}
.tiles{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.tiles button{justify-content:center;padding:14px 8px}
.tiles svg{width:100%;max-width:150px;height:auto;color:var(--ink)}
.defn{margin:0 0 6px}.hook{margin:0;color:var(--muted);font-size:15px}
.src{margin:4px 0 0;color:var(--muted);font-size:13px}
.ans.grade{flex-direction:row;margin-top:14px}.ans.grade button{justify-content:center;font-weight:700}
.card .bandbar{display:block;width:100%;height:auto;margin:0 0 10px}
/* footer */
.foot{font-size:14px;color:var(--muted);margin-top:28px}
.foot .links{display:flex;flex-wrap:wrap;gap:4px 16px;align-items:baseline}
.foot .links a{color:inherit}
.about h2{font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-weight:600;font-size:24px;color:var(--amber);margin:22px 0 4px}
.about p{margin:0 0 10px}
.about a{color:inherit}
.foot p{margin:0 0 8px}
.demobar{max-width:640px;margin:0 auto;padding:10px 16px 0;box-sizing:border-box}
.demobar p{margin:0;background:var(--amber-bg);border-radius:10px;padding:10px 14px;font-size:15px;display:flex;flex-wrap:wrap;gap:4px 14px;align-items:baseline}
.demobar.small p{padding:6px 12px;font-size:13px}.demobar .linkbtn{color:var(--ink)}.demobar.small .linkbtn{font-size:13px}
.linkbtn{font:inherit;font-size:14px;background:none;border:0;padding:0;color:var(--muted);text-decoration:underline;cursor:pointer}
.toast{position:fixed;left:50%;top:calc(12px + env(safe-area-inset-top,0px));transform:translateX(-50%);box-shadow:0 4px 18px rgba(0,0,0,.25);background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:10px;font-size:15px;max-width:90vw;pointer-events:none}
button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--amber);outline-offset:2px}
.wink b{display:block;font-style:normal;font-size:1.4em;color:#E9A33E}
.wink{position:fixed;inset:0;display:grid;place-items:center;padding:24px;background:rgba(0,0,0,.55);color:#fff;font-family:"Barlow Condensed","Arial Narrow",sans-serif;font-style:italic;font-weight:600;font-size:clamp(34px,8vw,64px);line-height:1.1;text-align:center;text-shadow:0 2px 12px rgba(0,0,0,.4);pointer-events:none;z-index:9;animation:winkveil 4.8s ease-in-out forwards}
.wink>*{grid-area:1/1;opacity:0}
.wink b{animation:wink1 4.8s ease-in-out forwards}
.wink span{animation:wink2 4.8s ease-in-out forwards}
@keyframes winkveil{0%{opacity:0}6%{opacity:1}94%{opacity:1}100%{opacity:0}}
@keyframes wink1{0%{opacity:0}8%{opacity:1}38%{opacity:1}46%{opacity:0}100%{opacity:0}}
@keyframes wink2{0%{opacity:0}48%{opacity:0}56%{opacity:1}92%{opacity:1}100%{opacity:0}}
@media (prefers-reduced-motion: reduce){.bar span{transition:none}.exam .card{transition:none;transform:none}.wink,.wink>*{animation:none;opacity:1}.wink{display:flex;flex-direction:column;align-items:center;justify-content:center}.wink b{margin-bottom:.15em}}