/* Roji Math Facts Trainer.
   Layout: Roji brand header; pick-what-to-practice on the left with Roji's tip and the Start button on the right
   (stacked on phones); one big question with a number pad while practicing; a fact-table chart of progress.
   The printed chart is its own sheet and always prints as dark ink on white paper. */
:root{
  --navy:#1D5B8D; --sky:#0B7CC9; --green:#3CC47C; --green-ink:#1E8A52;
  --bg:#EEF5FB; --surface:#FFFFFF; --ink:#16324A; --muted:#557089; --line:#CFE0EE; --field:#F7FBFE; --tint:#E3EFF9;
  --on-navy:#FFFFFF; --warn-bg:#FFF1CC; --warn-ink:#7A5400; --ok-bg:#DDF5E8; --ok-ink:#15693F;
  --star:#B97A00; --star-bg:#FFEBA8; --star-ink:#5C3F00;
  --c1:#0B7CC9; --c2:#F2A413; --quick-bg:#2FA868; --quick-ink:#FFFFFF; --learn-bg:#CFE4F6; --learn-ink:#1D5B8D;
  --title-fill:#0B7CC9; --title-stroke:#12344F;
  --shadow:0 1px 0 #d7e6f2, 0 10px 30px -18px rgba(29,91,141,.45);
  --f-display:"Luckiest Guy","Arial Rounded MT Bold","Trebuchet MS",sans-serif;
  --f-body:"Nunito",system-ui,-apple-system,"Segoe UI",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0E1B27; --surface:#15283A; --ink:#E6F0F8; --muted:#9BB3C8; --line:#27425A; --field:#10202F; --tint:#1B3247;
  --navy:#5CADE2; --sky:#5CADE2; --green-ink:#5FD897; --on-navy:#06121C;
  --warn-bg:#3B3013; --warn-ink:#F4CF6E; --ok-bg:#153B2A; --ok-ink:#7FE3AE;
  --star:#F4CF6E; --star-bg:#4A3B10; --star-ink:#FBE39B;
  --c1:#5CADE2; --c2:#F4BE4F; --quick-bg:#3CC47C; --quick-ink:#06301B; --learn-bg:#1F4463; --learn-ink:#BFE0F7;
  --title-fill:#5CADE2; --title-stroke:#06121C; --shadow:0 12px 30px -20px rgba(0,0,0,.8); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0E1B27; --surface:#15283A; --ink:#E6F0F8; --muted:#9BB3C8; --line:#27425A; --field:#10202F; --tint:#1B3247;
  --navy:#5CADE2; --sky:#5CADE2; --green-ink:#5FD897; --on-navy:#06121C;
  --warn-bg:#3B3013; --warn-ink:#F4CF6E; --ok-bg:#153B2A; --ok-ink:#7FE3AE;
  --star:#F4CF6E; --star-bg:#4A3B10; --star-ink:#FBE39B;
  --c1:#5CADE2; --c2:#F4BE4F; --quick-bg:#3CC47C; --quick-ink:#06301B; --learn-bg:#1F4463; --learn-ink:#BFE0F7;
  --title-fill:#5CADE2; --title-stroke:#06121C; --shadow:0 12px 30px -20px rgba(0,0,0,.8); color-scheme:dark}

*{box-sizing:border-box}
[hidden]{display:none!important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-body);font-size:16px;line-height:1.5;-webkit-text-size-adjust:100%}
.wrap{max-width:1100px;margin:0 auto;padding-inline:clamp(16px,3vw,32px);padding-block:12px 40px}
button,input,select,textarea{font-family:inherit}
button{touch-action:manipulation}
:focus-visible{outline:3px solid var(--green);outline-offset:2px}
p,h2,h3{margin:0}
ul,ol{margin:0;padding:0}

/* ---------- brand header (same on every Roji tool) ---------- */
.brandbar{display:flex;justify-content:space-between;align-items:center;gap:12px;font-weight:800;color:var(--navy);font-size:.9rem}
.brandbar a{color:inherit;text-decoration:none}
.brandbar .kit{letter-spacing:.08em;text-transform:uppercase;font-size:.72rem;color:var(--muted)}
.hero{display:flex;align-items:center;margin-block:4px 6px}
.hero-text{flex:1;min-width:0;padding-bottom:clamp(8px,2vw,20px)}
.eyebrow{font-weight:800;color:var(--green-ink);letter-spacing:.08em;text-transform:uppercase;font-size:.78rem}
h1{font-family:var(--f-display);font-weight:400;font-size:clamp(2.1rem,6vw,3.8rem);line-height:.95;margin:4px 0 10px;
  color:var(--title-fill);-webkit-text-stroke:2px var(--title-stroke);paint-order:stroke fill;letter-spacing:.01em;text-wrap:balance;text-shadow:0 3px 0 var(--title-stroke)}
h1 .grades{font-size:.5em;white-space:nowrap;-webkit-text-stroke:1.5px var(--title-stroke);text-shadow:0 2px 0 var(--title-stroke)}
.tagline{color:var(--muted);font-weight:700;max-width:52ch}
.roji{flex:0 0 auto;width:clamp(100px,18vw,180px);display:block}
.roji img{width:100%;height:auto;display:block;filter:drop-shadow(0 8px 12px rgba(18,52,79,.18))}
body.playing .hero,body.playing .tabs,body.playing footer.site,body.playing .notice{display:none}

/* ---------- shared pieces ---------- */
.tabs{display:flex;gap:6px;margin-bottom:14px}
.tab{font-size:1rem;font-weight:800;border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:8px 18px;min-height:44px;cursor:pointer}
.tab[aria-pressed="true"]{background:var(--navy);color:var(--on-navy);border-color:var(--navy)}
.panel{background:var(--surface);border-radius:18px;box-shadow:var(--shadow);padding:6px 20px 20px;min-width:0}
.grp{padding-top:14px;display:grid;gap:10px}
.grp+.grp{border-top:2px dashed var(--line);margin-top:16px}
.grp h2{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--green-ink);font-weight:800}
.hint{font-weight:600;font-size:.85rem;color:var(--muted)}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{font-size:.95rem;font-weight:800;border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:8px 14px;min-height:44px;min-width:44px;cursor:pointer}
.seg button[aria-pressed="true"]{background:var(--navy);color:var(--on-navy);border-color:var(--navy)}
.seg.ops{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.seg.ops button{border-radius:14px;display:flex;flex-direction:column;align-items:center;gap:0;padding:8px 4px;line-height:1.2}
.seg.ops .sign{font-family:var(--f-display);font-weight:400;font-size:1.9rem;line-height:1}
.seg.ops span{display:grid;font-size:.9rem}
.seg.ops small{font-size:.68rem;font-weight:700;opacity:.8}
.check{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--ink);font-size:.95rem;min-height:44px}
.check input{width:22px;height:22px;flex:none;accent-color:var(--green)}
.btn{display:inline-flex;align-items:center;justify-content:center;font-size:.95rem;font-weight:800;border:2px solid var(--navy);background:var(--navy);color:var(--on-navy);
  border-radius:12px;padding:9px 16px;min-height:44px;cursor:pointer;text-decoration:none}
.btn.ghost{background:transparent;color:var(--navy)}
.btn.small{font-size:.88rem;padding:6px 12px}
.btn.big{font-size:1.2rem;padding:12px 26px;min-height:56px;border-radius:16px;background:var(--green);border-color:var(--green);color:#06301B}
.btn:disabled,.chip:disabled{opacity:.45;cursor:not-allowed}
.actions{display:flex;flex-wrap:wrap;gap:8px}
.toast:empty{display:none}
.toast{background:var(--ok-bg);color:var(--ok-ink);border-radius:10px;padding:8px 12px;font-weight:700;font-size:.9rem}
.copybox{width:100%;min-height:64px;font-size:.8rem;font-weight:600;word-break:break-all;color:var(--ink);background:var(--field);border:2px solid var(--line);border-radius:10px;padding:8px}
.notice{background:var(--warn-bg);color:var(--warn-ink);border-radius:12px;padding:10px 14px;font-weight:700;display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center;justify-content:space-between;margin-bottom:14px}
.notice .btn.ghost{color:inherit;border-color:currentColor}
.chips{list-style:none;display:flex;flex-wrap:wrap;gap:6px}
.chips li{background:var(--star-bg);color:var(--star-ink);border-radius:8px;padding:2px 9px;font-weight:800;font-variant-numeric:tabular-nums}

/* ---------- home ---------- */
.home{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:20px;align-items:start}
@media (max-width:860px){.home{grid-template-columns:minmax(0,1fr)}}
.quick{display:flex;flex-wrap:wrap;gap:6px}
.chip{font-size:.9rem;font-weight:800;border:2px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:8px 13px;min-height:44px;cursor:pointer}
.chip[aria-pressed="true"]{background:var(--navy);color:var(--on-navy);border-color:var(--navy)}
.chip.star[aria-pressed="true"]{background:var(--star-bg);color:var(--star-ink);border-color:var(--star)}
.strats{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:8px}
.strat{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 8px;text-align:left;border:2px solid var(--line);background:var(--field);color:var(--ink);border-radius:14px;padding:10px 12px;cursor:pointer;min-height:44px}
.strat[aria-pressed="true"]{border-color:var(--navy);background:var(--tint);box-shadow:inset 0 0 0 1px var(--navy)}
.s-name{font-weight:800;font-size:1rem;line-height:1.2}
.s-ex{font-weight:800;color:var(--navy);font-variant-numeric:tabular-nums;white-space:nowrap}
.s-bar{grid-column:1/-1;height:8px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:4px}
.s-bar i{display:block;height:100%;background:var(--green);border-radius:99px}
.s-count{grid-column:1/-1;font-size:.76rem;font-weight:700;color:var(--muted)}
.lesson{display:grid;gap:14px;min-width:0}
.tipcard{background:var(--navy);color:var(--on-navy);border-radius:18px;padding:16px 20px;box-shadow:var(--shadow);display:grid;gap:6px}
.tip-eyebrow{font-size:.72rem;font-weight:800;text-transform:uppercase;letter-spacing:.1em;opacity:.85}
.tipcard h2{font-family:var(--f-display);font-weight:400;font-size:1.9rem;line-height:1.05;text-wrap:balance}
.tip-text{font-weight:700;font-size:1.05rem}
.worked{display:grid;gap:8px}
.worked:empty{display:none}
.worked:not(:empty){background:var(--surface);color:var(--ink);border-radius:12px;padding:12px 14px;margin-top:6px}
.ex-line{font-weight:800;color:var(--muted);font-size:.85rem;text-transform:uppercase;letter-spacing:.06em}
.ex-answer{font-family:var(--f-display);font-size:1.6rem;color:var(--green-ink);line-height:1}
.steps{padding-left:1.3em;display:grid;gap:2px;font-weight:700}
.steps .answer-line{list-style:none;margin-left:-1.3em;font-family:var(--f-display);font-weight:400;font-size:1.5rem;color:var(--green-ink)}
.startrow{display:flex;flex-wrap:wrap;gap:8px 14px;align-items:center}
.how{background:var(--surface);border-radius:14px;padding:12px 16px;box-shadow:var(--shadow)}
.how summary{cursor:pointer;font-weight:800;color:var(--navy);min-height:24px}
.how p{margin-top:8px;max-width:65ch}
.how ul{margin-top:8px;padding-left:1.2em;display:grid;gap:4px}
.how .actions{margin-top:10px}
.how .toast,.how .copybox{margin-top:8px}

/* ---------- tip pictures ---------- */
.vis{display:flex;flex-wrap:wrap;gap:10px;align-items:flex-start}
.frame{display:grid;grid-template-columns:repeat(5,26px);grid-auto-rows:26px;gap:0;border:2px solid var(--ink);border-radius:4px}
.cell{border:1px solid var(--muted);display:block;position:relative}
.cell::after{content:"";position:absolute;inset:3px;border-radius:50%}
.cell.a::after{background:var(--c1)}
.cell.b::after{background:var(--c2)}
.cell.x::after{border:2px dashed var(--muted);background:linear-gradient(to top right,transparent 44%,var(--muted) 44%,var(--muted) 56%,transparent 56%)}
.dots{display:grid;grid-template-columns:repeat(var(--cols),minmax(0,18px));gap:4px;max-width:100%}
.dot{display:block;aspect-ratio:1;border-radius:50%;background:var(--c1)}
.dot.b{background:var(--c2)}
.vis:not(.frames){display:grid;gap:4px}
.viscap,.novis{font-size:.8rem;font-weight:700;color:var(--muted)}

/* ---------- practice ---------- */
.play{max-width:520px;margin:0 auto;display:grid;gap:12px}
.playbar{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:12px;align-items:center}
.meter{height:12px;background:var(--line);border-radius:99px;overflow:hidden}
.meter i{display:block;height:100%;background:var(--green);border-radius:99px;transition:width .25s}
.q-count{font-weight:800;font-size:.85rem;color:var(--muted);font-variant-numeric:tabular-nums}
.qcard{background:var(--surface);border-radius:20px;box-shadow:var(--shadow);padding:20px 16px;display:grid;gap:12px;justify-items:center}
.fact{font-family:var(--f-display);font-size:clamp(2.6rem,13vw,4.2rem);line-height:1;color:var(--ink);display:flex;flex-wrap:wrap;gap:.25em;align-items:center;justify-content:center;font-variant-numeric:tabular-nums;padding-top:.1em}
.fact .eq{color:var(--muted)}
.answer{display:inline-flex;align-items:center;justify-content:center;min-width:1.9em;height:1.35em;padding:.12em .2em 0;border:3px solid var(--navy);border-radius:14px;background:var(--field);color:var(--navy)}
.answer.empty::after{content:"";width:3px;height:.8em;background:var(--navy);animation:blink 1s steps(2) infinite}
.answer.good{border-color:var(--green);background:var(--ok-bg);color:var(--ok-ink)}
.answer.bad{border-color:var(--star);background:var(--warn-bg)}
@keyframes blink{50%{opacity:0}}
.feedback{font-weight:800;font-size:1.1rem;text-align:center;min-height:1.6em;border-radius:10px;padding:2px 12px}
.feedback.good{background:var(--ok-bg);color:var(--ok-ink)}
.feedback.bad{background:var(--warn-bg);color:var(--warn-ink)}
.tip-area{justify-self:stretch;background:var(--tint);border-radius:14px;padding:12px 14px;display:grid;gap:10px}
.pad{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.key{font-family:var(--f-display);font-size:1.9rem;line-height:1;padding:.2em 0 0;min-height:58px;border:2px solid var(--line);border-bottom-width:4px;background:var(--surface);color:var(--ink);border-radius:14px;cursor:pointer}
.key:active{border-bottom-width:2px;transform:translateY(2px)}
.key.back{font-family:var(--f-body);font-size:1.5rem;color:var(--muted);padding:0}
.pad .key:last-child{grid-column:2}
.padrow{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:8px}
.padrow .btn{min-height:56px}
.padrow #check:only-child,.padrow #show-tip[hidden]+#check{grid-column:1/-1}

/* ---------- round done ---------- */
.done{max-width:640px;margin:0 auto}
.donecard{padding:20px;display:grid;gap:16px}
.done-h{font-family:var(--f-display);font-weight:400;font-size:2.2rem;line-height:1;color:var(--navy)}
.done-h:focus{outline:none}
.scores{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.score{background:var(--tint);border-radius:14px;padding:10px;display:grid;text-align:center}
.score b{font-family:var(--f-display);font-weight:400;font-size:1.8rem;line-height:1.1;color:var(--navy);font-variant-numeric:tabular-nums}
.score span{font-size:.8rem;font-weight:700;color:var(--muted);line-height:1.25}
.done h3{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--green-ink);font-weight:800;margin-bottom:8px}
.missed{list-style:none;display:grid;gap:8px}
.missed li{background:var(--warn-bg);color:var(--warn-ink);border-radius:12px;padding:8px 12px;display:grid}
.missed b{font-family:var(--f-display);font-weight:400;font-size:1.3rem}
.missed span{font-weight:700;font-size:.9rem}

/* ---------- chart ---------- */
.chartview{max-width:760px;margin:0 auto}
.gridwrap{overflow-x:auto;max-width:100%}
.grid{border-collapse:separate;border-spacing:2px;margin:0 auto;font-variant-numeric:tabular-nums}
.grid th{font-weight:800;font-size:.8rem;color:var(--muted);width:30px;height:24px;text-align:center}
.grid .corner{font-family:var(--f-display);font-weight:400;font-size:1.1rem;color:var(--navy)}
.grid td{padding:0}
.sq{display:flex;align-items:center;justify-content:center;width:30px;height:30px;border-radius:6px;border:2px solid var(--line);background:var(--field);color:var(--muted);font-weight:800;font-size:.9rem;font-style:normal;line-height:1;padding:0}
button.sq{cursor:pointer}
.grid.wide .sq{width:26px;height:26px}.grid.wide th{width:26px}
@media (max-width:440px){.grid{border-spacing:1px}.sq,.grid th{width:25px}.sq{height:25px}.grid.wide .sq,.grid.wide th{width:21px}.grid.wide .sq{height:21px;font-size:.75rem}}
.sq.learning{background:var(--learn-bg);border-color:var(--learn-bg);color:var(--learn-ink)}
.sq.known{background:var(--ok-bg);border-color:var(--green);color:var(--ok-ink)}
.sq.quick{background:var(--quick-bg);border-color:var(--quick-bg);color:var(--quick-ink)}
.sq.tricky{background:var(--star-bg);border-color:var(--star);color:var(--star-ink)}
.cell-detail{font-weight:800;text-align:center;min-height:1.5em}
.legend{list-style:none;display:flex;flex-wrap:wrap;gap:6px 16px;justify-content:center;font-size:.85rem;font-weight:700}
.legend li{display:flex;align-items:center;gap:6px}
.legend .sq{width:22px;height:22px;font-size:.75rem}
.legend b{color:var(--navy);font-variant-numeric:tabular-nums}

footer.site{margin-top:28px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:.85rem;font-weight:700}
footer.site a{color:var(--navy)}
@media (max-width:420px){.panel{padding-inline:14px}.seg.ops small{display:none}}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}

/* ---------- printed chart (US Letter). Fixed paper colors: this is what prints. ---------- */
.sheet{display:none}
@page{size:letter;margin:.5in}
@media print{
  body{background:#fff;color:#16324A}
  .wrap{display:none!important}
  .sheet{display:block;font-family:var(--f-body);color:#16324A;font-size:11pt;line-height:1.35}
  .sh-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-end;border-bottom:2px solid #1D5B8D;padding-bottom:8px}
  .sh-eyebrow{font-size:8.5pt;text-transform:uppercase;letter-spacing:.09em;font-weight:800;color:#4F6A82}
  .sh-title{font-family:var(--f-display);font-weight:400;font-size:22pt;line-height:1;color:#1D5B8D;margin:2px 0 4px}
  .sh-meta{font-weight:700;color:#4F6A82;font-size:10pt}
  .sh-name{font-weight:700;white-space:nowrap;font-size:10pt}
  .sh-name i{display:inline-block;width:1.9in;border-bottom:1.5px solid #16324A}
  .sh-grid{border-collapse:collapse;margin:14px auto 4px;font-variant-numeric:tabular-nums}
  .sh-grid th{width:.42in;height:.3in;font-size:10pt;font-weight:800;color:#1D5B8D;text-align:center}
  .sh-grid td{width:.42in;height:.36in;border:1.2px solid #16324A;text-align:center;font-weight:800;font-size:12pt}
  .sh-grid td.known{background:#DDF5E8}.sh-grid td.quick{background:#9BDDB9}.sh-grid td.tricky{background:#FFEBA8}.sh-grid td.learning{background:#E3EFF9}
  .sh-note{text-align:center;font-size:9pt;color:#4F6A82;font-weight:700}
  .sh-key{display:flex;flex-wrap:wrap;gap:4px 18px;justify-content:center;margin-top:8px;font-size:9.5pt;font-weight:700}
  .sh-key i{display:inline-block;width:14pt;height:14pt;line-height:12pt;border:1.2px solid #16324A;text-align:center;font-style:normal;font-weight:800;margin-right:5px;vertical-align:middle}
  .sh-key i.known{background:#DDF5E8}.sh-key i.quick{background:#9BDDB9}.sh-key i.tricky{background:#FFEBA8}.sh-key i.learning{background:#E3EFF9}
  .sh-tricky{margin-top:14px;break-inside:avoid}
  .sh-tricky h3{font-size:8.5pt;text-transform:uppercase;letter-spacing:.09em;color:#1D5B8D;margin:0 0 6px}
  .sh-facts{display:grid;grid-template-columns:repeat(4,1fr);gap:8px 14px;font-weight:800;font-size:12pt;font-variant-numeric:tabular-nums}
  .sh-foot{margin-top:14px;display:flex;align-items:center;gap:8px;font-weight:800;color:#1D5B8D;font-size:9pt;border-top:1px solid #C5D6E5;padding-top:6px}
  .sh-foot img{width:22pt;height:22pt;border-radius:50%}
  *{-webkit-print-color-adjust:exact;print-color-adjust:exact}
}