/* ==========================================================================
   Super 7 Live
   Aston University Mathematics School

   Built to the Aston University brand guidelines:
   Deep Purple as the ground, white type, the secondary palette only for the
   three pillars, the tertiary palette only for data. Sentence case, one
   typeface, very little motion.
   ========================================================================== */

/* ---------- type ---------- */
@font-face{
  font-family:"Schibsted Grotesk";
  font-style:normal;font-weight:400 900;font-display:swap;
  src:url(vendor/fonts/schibsted-grotesk-latin.woff2) format("woff2-variations"),
      url(vendor/fonts/schibsted-grotesk-latin.woff2) format("woff2");
  unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+0304,U+0308,U+0329,U+2000-206F,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD;
}
@font-face{
  font-family:"Schibsted Grotesk";
  font-style:normal;font-weight:400 900;font-display:swap;
  src:url(vendor/fonts/schibsted-grotesk-latin-ext.woff2) format("woff2-variations"),
      url(vendor/fonts/schibsted-grotesk-latin-ext.woff2) format("woff2");
  unicode-range:U+0100-02BA,U+02BD-02C5,U+02C7-02CC,U+02CE-02D7,U+02DD-02FF,U+1D00-1DBF,U+1E00-1E9F,U+1EF2-1EFF,U+2020,U+20A0-20AB,U+20AD-20C0,U+2113,U+2C60-2C7F,U+A720-A7FF;
}

/* ---------- tokens ---------- */
:root{
  /* primary */
  --deep:#610064; --deep-hi:#6F0A73; --deep-lo:#4A004C; --deep-ink:#3B003D;
  /* secondary, pillars only */
  --purple:#920088; --orange:#F93E26; --pink:#D30063;
  /* tertiary, data only */
  --blue:#5949EB; --green:#30F4BE; --grey:#B7B7B7;
  --green-ink:#0B6E50; --orange-ink:#B3260F;
  --green-25:#D5FCF1; --orange-12:#FEE7E3; --blue-12:#EAE8FD; --deep-06:#F5EEF5; --deep-12:#EBDDEB;
  /* neutrals */
  --ink:#150817; --ink-2:#5B5160; --ink-3:#8A808E;
  --line:#E5DEE7; --line-2:#CFC4D3;
  --paper:#F6F3F7; --white:#fff;

  --font:"Schibsted Grotesk","Aktiv Grotesk",Arial,Helvetica,sans-serif;
  --r:3px;                          /* the brand is square-edged: keep corners tight */
  --r-lg:6px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --u:1vmin;                        /* pillar unit */
  --top:64px;
  --gut:clamp(16px,4vw,40px);
  --shadow-1:0 1px 0 rgba(21,8,23,.04),0 1px 2px rgba(21,8,23,.06);
  --shadow-2:0 1px 2px rgba(21,8,23,.06),0 8px 24px -6px rgba(59,0,61,.16);
  --shadow-3:0 2px 6px rgba(21,8,23,.08),0 24px 60px -12px rgba(59,0,61,.35);
  color-scheme:light;
  accent-color:var(--deep);
}
@media (max-width:640px){ :root{ --top:56px; } }

/* ---------- base ---------- */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;background:var(--paper)}
body{
  min-height:100vh;min-height:100dvh;
  font-family:var(--font);font-size:16px;line-height:1.5;font-weight:400;
  color:var(--ink);background:var(--paper);
  -webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
  font-optical-sizing:auto;text-rendering:optimizeLegibility;
  font-feature-settings:"kern","liga";
}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer;background:none;border:0}
b,strong{font-weight:650}
a{color:inherit}
svg{flex-shrink:0}
h1,h2,h3{font-weight:500;letter-spacing:-.02em;line-height:1.1;text-wrap:balance}
p{text-wrap:pretty}
::selection{background:var(--deep);color:#fff}
[hidden]{display:none!important}
.katex{font-size:1.06em}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* one focus style everywhere: orange, because it reads on white and on purple */
:focus{outline:none}
:focus-visible{outline:3px solid var(--orange);outline-offset:2px}

/* diagrams from the packs pick up the site typeface */
.qsvg svg text,.gd svg text{font-family:var(--font)}

/* ==========================================================================
   Header
   ========================================================================== */
.top{
  position:sticky;top:0;z-index:40;
  display:flex;align-items:center;gap:14px;
  height:calc(var(--top) + env(safe-area-inset-top));
  padding:env(safe-area-inset-top) max(var(--gut),env(safe-area-inset-right)) 0 max(var(--gut),env(safe-area-inset-left));
  background:var(--deep);color:#fff;
}
.top::after{ /* hairline that only shows once the page scrolls under the bar */
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:rgba(255,255,255,.12);
  opacity:0;transition:opacity .2s;
}
.scrolled .top::after{opacity:1}
.brand{display:flex;align-items:center;color:#fff;text-decoration:none;border-radius:var(--r)}
.brand .logo{display:block;height:34px;width:calc(34px * 6057 / 1167)}
.prodname{display:flex;flex-direction:column;justify-content:center;line-height:1.15;padding-left:18px;margin-left:4px;
  border-left:1px solid rgba(255,255,255,.28);min-width:0}
.prodname .p{font-size:15px;font-weight:600;letter-spacing:-.005em;white-space:nowrap}
.prodname .ttl{font-size:13px;color:rgba(255,255,255,.72);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:34ch}
.top .sp{flex:1}
.chip{
  display:inline-flex;align-items:center;gap:8px;height:32px;padding:0 12px;
  font-size:13.5px;font-weight:500;line-height:1;white-space:nowrap;color:#fff;
  background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.22);border-radius:var(--r);
  max-width:40vw;overflow:hidden;text-overflow:ellipsis;
}
button.chip{transition:background .15s}
button.chip:hover{background:rgba(255,255,255,.18)}
.chip.live::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--green);flex:none;
  box-shadow:0 0 0 0 rgba(48,244,190,.6);animation:beat 2.4s var(--ease) infinite}
.offline .chip.live::before{background:var(--grey);animation:none}
@keyframes beat{0%{box-shadow:0 0 0 0 rgba(48,244,190,.55)}70%,100%{box-shadow:0 0 0 7px rgba(48,244,190,0)}}
#who::after{content:"";width:12px;height:12px;flex:none;opacity:.7;
  background:currentColor;-webkit-mask:var(--i-edit) center/contain no-repeat;mask:var(--i-edit) center/contain no-repeat}

@media (max-width:1000px){ .prodname .ttl{max-width:22ch} }
@media (max-width:860px){ .prodname{display:none} }
@media (max-width:640px){
  .top{gap:8px}
  .brand .logo{height:27px;width:calc(27px * 6057 / 1167)}
  .chip{height:30px;padding:0 10px;font-size:13px}
}
@media (max-width:420px){
  .brand .logo{height:24px;width:calc(24px * 6057 / 1167)}
  #who{max-width:28vw}
}
@media (max-width:360px){ #who{display:none!important} }

/* connection lost */
.demo,.offbar{font-size:13.5px;font-weight:500;text-align:center;padding:8px var(--gut)}
.demo{background:#FFF4D6;color:#5E4700;border-bottom:1px solid #EFD897}
.offbar{position:sticky;top:calc(var(--top) + env(safe-area-inset-top));z-index:39;background:var(--ink);color:#fff;display:none}
.offline .offbar{display:block}

/* ==========================================================================
   Buttons and inputs
   ========================================================================== */
.btn{
  --bg:var(--deep);--fg:#fff;--bd:var(--deep);
  position:relative;display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:0 22px;
  font-size:16px;font-weight:600;letter-spacing:-.005em;line-height:1;white-space:nowrap;
  color:var(--fg);background:var(--bg);border:1.5px solid var(--bd);border-radius:var(--r);
  transition:background-color .15s,border-color .15s,color .15s,transform .1s;
  -webkit-tap-highlight-color:transparent;touch-action:manipulation;user-select:none;
}
.btn:hover{--bg:var(--deep-lo);--bd:var(--deep-lo)}
.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.4;pointer-events:none}
.btn.gold{} /* primary: the default look */
.btn.grey{--bg:#fff;--fg:var(--ink);--bd:var(--line-2)}
.btn.grey:hover{--bg:var(--deep-06);--bd:var(--deep)}
.btn.small{min-height:36px;padding:0 13px;font-size:14px;gap:6px}
.btn.on{--bg:var(--deep);--fg:#fff;--bd:var(--deep)}
.btn.arrow::after{content:"";width:18px;height:18px;background:currentColor;
  -webkit-mask:var(--i-arrow) center/contain no-repeat;mask:var(--i-arrow) center/contain no-repeat;transition:transform .2s var(--ease)}
.btn.arrow:hover::after{transform:translateX(3px)}

.inp{
  display:block;width:100%;min-height:52px;padding:0 16px;
  font-size:18px;font-weight:500;letter-spacing:-.005em;
  color:var(--ink);background:#fff;border:1.5px solid var(--line-2);border-radius:var(--r);
  transition:border-color .15s,box-shadow .15s;
  -webkit-appearance:none;appearance:none;
}
.inp::placeholder{color:var(--ink-3);font-weight:400}
.inp:hover{border-color:var(--ink-3)}
.inp:focus,.inp:focus-visible{outline:none;border-color:var(--deep);box-shadow:0 0 0 3px rgba(97,0,100,.16)}
select.inp{padding-right:44px;cursor:pointer;
  background:#fff var(--i-chev) no-repeat right 16px center/14px}

.muted{color:var(--ink-2);font-size:15px}
.lab{font-size:12.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-2)}

/* ==========================================================================
   Stage: the full-bleed purple screens (waiting, joining, PIN, finished)
   ========================================================================== */
.stage{
  position:relative;isolation:isolate;overflow:hidden;
  min-height:calc(100vh - var(--top));min-height:calc(100dvh - var(--top) - env(safe-area-inset-top));
  display:flex;align-items:center;
  padding:clamp(32px,7vh,96px) max(var(--gut),env(safe-area-inset-right)) calc(clamp(32px,8vh,96px) + env(safe-area-inset-bottom)) max(var(--gut),env(safe-area-inset-left));
  background:var(--deep);color:#fff;
}
.stage-in{position:relative;z-index:2;width:100%;max-width:38rem;margin-left:clamp(0px,6vw,96px)}
.stage .kicker{font-size:15px;font-weight:500;color:rgba(255,255,255,.78);margin-bottom:clamp(14px,2.2vh,22px);display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.stage .kicker .dot{width:4px;height:4px;border-radius:50%;background:currentColor;opacity:.6}
.stage h1{font-size:clamp(2.5rem,1.3rem + 4.6vw,5rem);line-height:1.0;letter-spacing:-.035em;font-weight:500;color:#fff}
.stage h1 .hl{color:var(--orange)} /* the one place orange type is allowed: headline highlights on Deep Purple */
.stage .lede{font-size:clamp(1.06rem,.98rem + .35vw,1.3rem);line-height:1.45;color:rgba(255,255,255,.86);margin-top:clamp(16px,2.6vh,26px);max-width:32rem}
.stage .lede + .lede{margin-top:10px}
.stage .form{display:flex;gap:10px;margin-top:clamp(22px,4vh,36px);max-width:32rem}
.stage .form .inp{flex:1;min-width:0;border-color:transparent;min-height:56px}
.stage .form .inp:focus{border-color:#fff;box-shadow:0 0 0 4px rgba(255,255,255,.28)}
.stage .btn{--bg:#fff;--fg:var(--deep);--bd:#fff;min-height:56px;padding:0 24px}
.stage .btn:hover{--bg:#F2E8F2;--bd:#F2E8F2}
.stage .hint{font-size:14px;color:rgba(255,255,255,.66);margin-top:14px}
.stage .facts{display:flex;flex-wrap:wrap;gap:10px 28px;margin-top:clamp(26px,5vh,44px);padding-top:18px;border-top:1px solid rgba(255,255,255,.2);max-width:32rem}
.stage .facts div{font-size:14px;color:rgba(255,255,255,.7);line-height:1.35}
.stage .facts b{display:block;font-size:16px;font-weight:600;color:#fff}
@media (max-width:560px){
  .stage{align-items:flex-end}
  .stage .form{flex-direction:column}
  .stage .form .btn{width:100%}
}

/* the pillars: one-unit SVGs, placed by anchor, sized by --u */
.pillars{position:absolute;inset:0;z-index:0;pointer-events:none}
.pl{position:absolute;width:var(--u);height:var(--u);overflow:visible;transform:scale(var(--k,1));transform-origin:0 0}
.pl.p1{left:var(--p1x,26%);top:var(--p1y,19%);fill:var(--pink)}
.pl.p2{left:var(--p2x,71%);top:var(--p2y,36%);fill:var(--orange)}
.pl.p3{left:var(--p3x,54%);top:var(--p3y,66%);fill:var(--purple)}
.stage{--k:1.05}
/* layouts, so each screen feels like the next frame of the same story */
.stage.l2{--p1x:34%;--p1y:22%;--p2x:76%;--p2y:52%;--p3x:60%;--p3y:74%}
.stage.l3{--p1x:18%;--p1y:18%;--p2x:68%;--p2y:28%;--p3x:50%;--p3y:60%}
@media (max-width:900px){
  .stage{--k:1.35}
  .pl.p1{left:var(--m1x,44%);top:var(--m1y,10%)}
  .pl.p2{left:var(--m2x,80%);top:var(--m2y,20%)}
  .pl.p3{left:var(--m3x,97%);top:var(--m3y,34%)}
  .stage.l2{--m1x:56%;--m1y:8%;--m2x:84%;--m2y:23%;--m3x:98%;--m3y:40%}
  .stage.l3{--m1x:36%;--m1y:9%;--m2x:78%;--m2y:18%;--m3x:96%;--m3y:32%}
}
@media (max-width:900px) and (orientation:landscape){ .pillars{opacity:.35} }

/* entrance: one slow drift along each pillar's own direction, then still */
@media (prefers-reduced-motion:no-preference){
  .pl{animation:drift 1.1s var(--ease) both}
  .pl.p1{--dx:-4.6;--dy:-6.6}
  .pl.p2{--dx:7.9;--dy:.9;animation-delay:.08s}
  .pl.p3{--dx:.7;--dy:8;animation-delay:.16s}
  .stage-in{animation:rise .6s var(--ease) .12s both}
  .wrap,.dash{animation:rise .35s var(--ease) both}
}
@keyframes drift{from{opacity:0;translate:calc(var(--dx)*var(--u)) calc(var(--dy)*var(--u))}to{opacity:1;translate:0 0}}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

/* ==========================================================================
   Working screens: question band, question, whiteboard, answer
   ========================================================================== */
.band{
  background:var(--deep);color:#fff;
  padding:clamp(18px,3vh,30px) max(var(--gut),env(safe-area-inset-right)) clamp(40px,6vh,58px) max(var(--gut),env(safe-area-inset-left));
  clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),0 100%); /* the pillar angle, as an edge */
  margin-bottom:-18px;
}
.band.wide .band-in{max-width:1240px}
.band-in{max-width:880px;margin:0 auto;display:flex;align-items:flex-end;gap:16px 24px;flex-wrap:wrap}
.band .k{font-size:14px;font-weight:500;color:rgba(255,255,255,.72);margin-bottom:6px;display:flex;gap:10px;align-items:center}
.band .sub{font-size:15px;color:rgba(255,255,255,.78);margin-top:8px;max-width:40rem}
.band h1{font-size:clamp(1.7rem,1.2rem + 2vw,2.6rem);letter-spacing:-.03em;color:#fff}
.band .steps{display:flex;gap:4px;margin-left:auto;padding-bottom:6px}
.band .steps i{width:26px;height:4px;background:rgba(255,255,255,.25);transform:skewX(-35deg)}
.band .steps i.on{background:#fff}
.band .steps i.done{background:rgba(255,255,255,.6)}

.wrap.wide{max-width:1240px}
.wrap{position:relative;max-width:880px;margin:0 auto;padding:0 max(var(--gut),env(safe-area-inset-right)) calc(56px + env(safe-area-inset-bottom)) max(var(--gut),env(safe-area-inset-left))}
.qhead{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:12px}
.tag{display:inline-flex;align-items:center;height:26px;padding:0 10px;font-size:13px;font-weight:600;color:#fff;background:var(--deep);border-radius:var(--r);white-space:nowrap}
.tag.gold{background:var(--pink)}

.panel,.qtext{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1)}
.qtext{position:relative;z-index:1;padding:clamp(18px,3vw,28px);font-size:clamp(1.12rem,1rem + .5vw,1.35rem);line-height:1.5;letter-spacing:-.005em}
.qsvg{margin-top:12px;padding:16px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);text-align:center}
.qsvg svg{max-width:100%;height:auto;max-height:300px}

/* whiteboard with its toolbar fastened to the bottom edge */
.boardwrap{margin-top:14px;background:#fff;border:1px solid var(--line-2);border-bottom:0;border-radius:var(--r-lg) var(--r-lg) 0 0;overflow:hidden;position:relative}
.boardwrap::before{content:"Working out";position:absolute;top:10px;left:12px;font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);pointer-events:none}
.boardwrap canvas{display:block;width:100%;height:44vh;height:44dvh;min-height:240px;touch-action:none;cursor:crosshair}
.boardwrap.small canvas{height:30vh;height:30dvh;min-height:200px}
.tools{display:flex;align-items:center;gap:6px 14px;flex-wrap:wrap;padding:8px 10px;background:#FBFAFC;border:1px solid var(--line-2);border-radius:0 0 var(--r-lg) var(--r-lg)}
.tools .pens,.tools .ws,.tools .acts{display:inline-flex;align-items:center;gap:4px}
.tools .acts{margin-left:auto}
.tools .pen{width:32px;height:32px;border-radius:50%;display:grid;place-items:center}
.tools .pen::before{content:"";width:18px;height:18px;border-radius:50%;background:var(--c);transition:transform .15s var(--ease)}
.tools .pen:hover::before{transform:scale(1.12)}
.tools .pen.on{box-shadow:inset 0 0 0 2px var(--c)}
.tools .ws button{width:32px;height:32px;display:grid;place-items:center;border-radius:var(--r)}
.tools .ws i{display:block;border-radius:50%;background:var(--ink-2)}
.tools .ws button:hover{background:var(--deep-06)}
.tools .ws button.on{background:var(--deep-12)}
.tools .ws button.on i{background:var(--deep)}
.tb{height:32px;padding:0 11px;font-size:14px;font-weight:500;color:var(--ink);border-radius:var(--r)}
.tb:hover{background:var(--deep-06)}
.tb.on{background:var(--deep);color:#fff}
@media (max-width:520px){ .tools .acts{margin-left:0} .tb{padding:0 9px} }

.ansrow{display:flex;gap:10px;margin-top:16px}
.ansrow .inp{flex:1;min-width:0}
.ansrow .btn{min-height:52px;min-width:108px}
@media (max-width:420px){ .ansrow .btn{min-width:0} }

/* verdicts */
.verdict{margin-top:12px;font-size:16px;line-height:1.45}
.verdict:empty{display:none}
.verdict.ok,.verdict.no{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:var(--r-lg);color:var(--ink)}
.verdict.ok{background:var(--green-25)}
.verdict.no{background:var(--orange-12)}
.verdict.ok::before,.verdict.no::before{content:"";flex:none;width:24px;height:24px;border-radius:50%;margin-top:-1px;
  background:var(--vc) var(--vi) center/14px no-repeat}
.verdict.ok::before{--vc:var(--green-ink);--vi:var(--i-tick)}
.verdict.no::before{--vc:var(--orange-ink);--vi:var(--i-cross)}
.verdict b{font-weight:650}
@media (prefers-reduced-motion:no-preference){
  .verdict.ok,.verdict.no{animation:rise .3s var(--ease) both}
  .verdict.ok::before{animation:pop .45s var(--ease) both}
}
@keyframes pop{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.12);opacity:1}100%{transform:scale(1)}}

/* worked solutions */
.sol{margin-top:16px}
.sol:empty{display:none}
.solinner{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:6px 20px 20px;box-shadow:var(--shadow-1);counter-reset:s}
.solinner .lab{display:block;padding:14px 0 10px;border-bottom:1px solid var(--line);color:var(--deep)}
.solinner .step{counter-increment:s;display:grid;grid-template-columns:28px minmax(0,150px) 1fr;gap:6px 14px;align-items:baseline;padding:12px 0;border-bottom:1px solid var(--line);font-size:16.5px}
.solinner .step::before{content:counter(s);font-size:13px;font-weight:600;color:var(--ink-3);font-variant-numeric:tabular-nums}
.solinner .step .t{font-size:14px;font-weight:600;color:var(--deep)}
.solinner .final{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap;margin-top:16px;padding:14px 18px;background:var(--deep);color:#fff;border-radius:var(--r);font-size:18px;font-weight:500}
.solinner .final::before{content:"Answer";font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:rgba(255,255,255,.7)}
@media (max-width:560px){
  .solinner{padding:4px 16px 16px}
  .solinner .step{grid-template-columns:22px 1fr}
  .solinner .step>span:last-child{grid-column:2}
}

/* extension: earned, so it gets the brand treatment */
.extcard{position:relative;isolation:isolate;overflow:hidden;margin-top:22px;padding:clamp(18px,3vw,28px);background:var(--deep);color:#fff;border-radius:var(--r-lg)}
.extcard::after{ /* one pink pillar end, coming in from the top edge */
  content:"";position:absolute;z-index:-1;right:-36px;top:0;width:200px;height:160px;pointer-events:none;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 200 160'%3E%3Cpolygon fill='%23D30063' points='115.5,96.8 184.5,87.2 -159.7,-404.3 -228.6,-394.6'/%3E%3C/svg%3E") no-repeat right top/contain}
@media (max-width:560px){ .extcard::after{width:150px;height:120px;right:-40px} }
.exthead{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:14px;padding-right:90px}
.exthead .muted{color:rgba(255,255,255,.78)}
.extcard .tag.gold{background:#fff;color:var(--deep)}
.extcard .qtext{background:transparent;border:0;box-shadow:none;padding:0;color:#fff}
.extcard .boardwrap{border-color:transparent}
.extcard .boardwrap + *,.extcard .ansrow{margin-top:14px}
.extcard .inp{border-color:transparent}
.extcard .inp:focus{border-color:#fff;box-shadow:0 0 0 4px rgba(255,255,255,.28)}
.extcard .btn{--bg:#fff;--fg:var(--deep);--bd:#fff}
.extcard .btn:hover{--bg:#F2E8F2;--bd:#F2E8F2}
.extcard .solinner{box-shadow:none;border:0}
@media (prefers-reduced-motion:no-preference){ .extcard{animation:rise .45s var(--ease) both} }

/* ==========================================================================
   The twelve
   ========================================================================== */
.ggrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,250px),1fr));gap:12px;margin-top:4px}
.gcell{
  position:relative;z-index:1;container-type:inline-size;
  display:flex;flex-direction:column;gap:10px;min-height:150px;padding:16px 16px 14px;text-align:left;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1);
  transition:border-color .15s,box-shadow .2s,transform .2s var(--ease);
}
.gcell:hover{border-color:var(--deep);box-shadow:var(--shadow-2);transform:translateY(-2px)}
.gcell .gn{display:flex;align-items:center;gap:6px;font-size:13px;font-weight:600;color:var(--deep)}
.gcell .gn .mk{font-weight:500;color:var(--ink-2)}
.gcell .gn::after{content:"";margin-left:auto;width:16px;height:16px;background:var(--ink-3);opacity:.7;
  -webkit-mask:var(--i-open) center/contain no-repeat;mask:var(--i-open) center/contain no-repeat;transition:transform .2s var(--ease)}
.gcell:hover .gn::after{background:var(--deep);opacity:1;transform:translate(2px,-2px)}
.gcell .gq{font-size:15.5px;line-height:1.42;color:var(--ink)}
.gcell .gd{display:flex;justify-content:center}
.gcell .gd svg{max-width:100%;height:auto;max-height:110px}
.gcell .ga{margin-top:auto;font-size:15px;font-weight:600}
.gcell .ga:empty{display:none}
.gcell .ga.on{display:flex;gap:8px;align-items:baseline;padding:8px 10px;background:var(--green-25);border-radius:var(--r)}
.gcell .ga.on::before{content:"Answer";font-size:12px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--green-ink)}

/* one question opened from the twelve */
.over{position:fixed;inset:0;z-index:60;display:flex;align-items:flex-start;justify-content:center;overflow:auto;overscroll-behavior:contain;
  padding:max(16px,env(safe-area-inset-top)) 16px max(16px,env(safe-area-inset-bottom));
  background:rgba(33,0,35,.55);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}
.overbox{position:relative;width:100%;max-width:820px;margin:auto 0;padding:clamp(20px,3vw,32px);background:var(--paper);border-radius:var(--r-lg);box-shadow:var(--shadow-3)}
.overbox .qhead{padding-right:48px}
.overbox .x{position:absolute;top:12px;right:12px;width:44px;height:44px;display:grid;place-items:center;border-radius:var(--r);font-size:0;color:var(--ink)}
.overbox .x::before{content:"";width:18px;height:18px;background:currentColor;-webkit-mask:var(--i-x) center/contain no-repeat;mask:var(--i-x) center/contain no-repeat}
.overbox .x:hover{background:var(--deep-06)}
@media (prefers-reduced-motion:no-preference){
  .over{animation:fade .2s ease both}
  .overbox{animation:sheet .35s var(--ease) both}
}
@keyframes fade{from{opacity:0}}
@keyframes sheet{from{opacity:0;transform:translateY(24px)}}
@media (max-width:640px){
  .over{padding:0;align-items:flex-end}
  .overbox{margin:0;border-radius:var(--r-lg) var(--r-lg) 0 0;min-height:92dvh;padding-bottom:calc(24px + env(safe-area-inset-bottom))}
}

/* ==========================================================================
   A note from the teacher, and the toast
   ========================================================================== */
.note{
  position:fixed;z-index:70;left:50%;top:calc(var(--top) + env(safe-area-inset-top) + 12px);
  width:min(560px,calc(100vw - 24px));translate:-50% 0;
  display:none;gap:16px;align-items:center;padding:16px 16px 16px 20px;
  background:#fff;border-radius:var(--r-lg);box-shadow:var(--shadow-3);font-size:17px;line-height:1.4;
  border-top:4px solid var(--pink);
}
.note.show{display:flex}
.note .who{display:block;font-size:13px;font-weight:600;color:var(--pink);margin-bottom:3px}
.note .btn{margin-left:auto;flex:none}
@media (prefers-reduced-motion:no-preference){ .note.show{animation:drop .4s var(--ease) both} }
@keyframes drop{from{opacity:0;transform:translateY(-14px)}}

#toast{
  position:fixed;z-index:80;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));translate:-50% 0;
  padding:12px 18px;font-size:15px;font-weight:500;color:#fff;background:var(--ink);border-radius:var(--r);box-shadow:var(--shadow-3);
  opacity:0;transform:translateY(8px);pointer-events:none;transition:opacity .2s,transform .25s var(--ease);
}
#toast.show{opacity:1;transform:none}

/* first paint, before the database answers */
.boot{min-height:calc(100dvh - var(--top));display:grid;place-items:center;background:var(--deep)}
.boot i{width:36px;height:4px;background:rgba(255,255,255,.25);position:relative;overflow:hidden;transform:skewX(-35deg)}
.boot i::after{content:"";position:absolute;inset:0;background:#fff;animation:load 1.1s var(--ease) infinite}
@keyframes load{from{translate:-100% 0}to{translate:100% 0}}

/* ==========================================================================
   Teacher
   ========================================================================== */
body.teacher{background:var(--paper)}
.dash{max-width:1440px;margin:0 auto;padding:18px max(var(--gut),env(safe-area-inset-right)) 60px max(var(--gut),env(safe-area-inset-left))}
body.teacher #main > .tbar{margin-top:0}

.tbar{
  position:sticky;top:calc(var(--top) + env(safe-area-inset-top));z-index:30;
  display:flex;align-items:center;gap:8px 10px;flex-wrap:wrap;
  margin:0 calc(-1 * var(--gut));padding:12px var(--gut);
  background:rgba(246,243,247,.88);-webkit-backdrop-filter:saturate(1.4) blur(10px);backdrop-filter:saturate(1.4) blur(10px);
  border-bottom:1px solid var(--line);
}
.tbar .sp{flex:1}
.tbar .btn.small{--bg:#fff;--fg:var(--ink);--bd:var(--line-2)}
.tbar .btn.small:hover{--bd:var(--deep);--bg:var(--deep-06)}
.tbar .btn.small.on{--bg:var(--deep);--fg:#fff;--bd:var(--deep)}
.tbar .btn.gold.small{--bg:var(--deep);--fg:#fff;--bd:var(--deep)}
.tbar .btn.gold.small:hover{--bg:var(--deep-lo)}
.tbar .btn.grey.small{--bg:transparent;--bd:transparent;--fg:var(--ink-2)}
.tbar .btn.grey.small:hover{--bg:var(--orange-12);--fg:var(--orange-ink)}
.ydgroup{display:inline-flex;align-items:center;gap:0;padding-left:12px;margin-left:2px;border-left:1px solid var(--line-2)}
.ydgroup .lab{margin-right:8px;white-space:nowrap}
.ydgroup .btn.small{min-width:40px;padding:0 10px;border-radius:0;margin-left:-1.5px}
.ydgroup .btn.small:first-of-type{border-radius:var(--r) 0 0 var(--r);margin-left:0}
.ydgroup .btn.small:last-of-type{border-radius:0 var(--r) var(--r) 0}
.ydgroup .btn.small.on{position:relative;z-index:1}
.ydgroup + .btn{margin-left:4px}
.wkpick{display:inline-flex;align-items:center;gap:8px;padding-right:12px;margin-right:2px;border-right:1px solid var(--line-2)}
.wkpick .lab{white-space:nowrap}
.inp.small{min-height:36px;width:auto;max-width:280px;font-size:14px;font-weight:600;padding:0 36px 0 12px;background-position:right 12px center;background-size:12px}
@media (max-width:760px){
  .tbar{position:static;background:transparent;-webkit-backdrop-filter:none;backdrop-filter:none;padding-top:4px}
  .ydgroup{order:-1;width:100%;padding-left:0;margin-left:0;border-left:0;overflow-x:auto;scrollbar-width:none;padding-bottom:2px}
  .wkpick{order:-2;width:100%;border-right:0;padding-right:0}
  .wkpick .inp.small{flex:1;max-width:none}
  .ydgroup::-webkit-scrollbar{display:none}
  .ydgroup .btn.small{flex:1 0 40px}
  .tally{grid-template-columns:1fr 1fr;gap:8px}
  .tally .tile{padding:14px 14px 12px}
  .tally .tile .n{font-size:2rem}
  .tally .tile:nth-child(5){grid-column:span 2}
  .tally .tile:only-child{grid-column:1/-1}
}

.tally{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px;margin-top:18px}
.tally .tile:only-child{grid-column:span 1;min-width:200px}
@media (max-width:1000px) and (min-width:761px){ .tally{grid-template-columns:repeat(3,minmax(0,1fr))} }
.tally .tile{position:relative;padding:18px 18px 16px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1);overflow:hidden}
.tally .tile::before{content:"";position:absolute;left:0;top:0;right:0;height:3px;background:var(--tc,var(--deep))}
.tally .tile .n{font-size:clamp(2.2rem,1.6rem + 1.6vw,3.2rem);font-weight:500;letter-spacing:-.04em;line-height:1;font-variant-numeric:tabular-nums;color:var(--ink)}
.tally .tile .l{font-size:14px;color:var(--ink-2);margin-top:8px}
.tally .tile.good{--tc:var(--green)}
.tally .tile.gold{--tc:var(--pink)}
.tally .tile.blue{--tc:var(--blue)}
.tally .tile.pct{--tc:var(--grey)}
.meter{grid-column:1/-1;display:flex;flex-direction:column;gap:10px;padding:16px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1)}
.meter .bar{display:flex;height:14px;background:var(--paper);border-radius:2px;overflow:hidden}
.meter .bar i{display:block;height:100%;transition:flex-basis .5s var(--ease)}
.meter .bar .c{background:var(--green)}
.meter .bar .w{background:var(--orange)}
.meter .bar .x{background:var(--deep)}
.meter .key{display:flex;flex-wrap:wrap;gap:6px 20px;font-size:13.5px;color:var(--ink-2)}
.meter .key span{display:inline-flex;align-items:center;gap:7px;font-variant-numeric:tabular-nums}
.meter .key span::before{content:"";width:10px;height:10px;border-radius:2px;background:var(--kc)}

.wrongs{margin-top:12px;display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:14px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1)}
.wrongs .lab{width:100%;margin-bottom:2px}
.wrongs .muted{font-size:14.5px}
.wchip{display:inline-flex;align-items:center;gap:10px;height:34px;padding:0 4px 0 12px;font-size:15px;background:var(--orange-12);border-radius:var(--r);color:var(--ink)}
.wchip b{font-weight:600}
.wchip{font-variant-numeric:tabular-nums}
.wchip .c{min-width:26px;height:26px;display:grid;place-items:center;padding:0 7px;font-size:13px;font-weight:600;color:#fff;background:var(--orange-ink);border-radius:2px}

.roster{margin-top:12px;padding:14px 18px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1)}
.rhead{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:12px}
.rhead .inp{max-width:340px;min-height:44px;font-size:16px;padding-left:42px;background:#fff var(--i-search) no-repeat 14px center/17px}
.rhead .muted{font-size:14px;font-variant-numeric:tabular-nums}
.rlist{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:6px;max-height:48vh;overflow:auto;overscroll-behavior:contain;padding:2px;margin:-2px}
.rw{display:flex;align-items:center;gap:10px;min-height:44px;padding:0 8px 0 12px;text-align:left;background:var(--paper);border:1px solid transparent;border-radius:var(--r);transition:border-color .12s,background .12s}
.rw:hover{border-color:var(--deep);background:#fff}
.rw .nm{flex:1;min-width:0;font-size:14.5px;font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.rw .av{max-width:80px;font-size:13px;color:var(--ink-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-variant-numeric:tabular-nums}
.rw .mk{width:22px;height:22px;flex:none;display:grid;place-items:center;font-size:12px;font-weight:700;border-radius:2px;color:transparent}
.rw.ok .mk{background:var(--green);color:var(--ink)}
.rw.no .mk{background:var(--orange);color:#fff}
.rw.ext .mk{background:var(--deep);color:#fff}
.rw.ok{background:#F1FEFA}
.rw.no{background:#FFF5F3}
.rw.ext{background:var(--deep-06)}

.qline{display:flex;align-items:baseline;gap:6px 16px;flex-wrap:wrap;margin-top:18px;padding:14px 18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1)}
.qline .t{font-size:18px;font-weight:500;letter-spacing:-.01em}
.qline .a{margin-left:auto;display:inline-flex;align-items:baseline;gap:10px;padding:6px 12px;background:var(--deep-06);border-radius:var(--r);font-size:16px}
.qline .a .lab{font-size:11.5px;color:var(--deep)}

/* drill-down: a drawer on a laptop, a sheet on a phone */
#focus:empty{display:none}
#focus{position:fixed;z-index:50;top:calc(var(--top) + env(safe-area-inset-top));right:0;bottom:0;width:min(480px,100vw);
  background:#fff;box-shadow:var(--shadow-3);overflow:auto;overscroll-behavior:contain}
.focusbox{padding:20px 22px calc(24px + env(safe-area-inset-bottom))}
@media (prefers-reduced-motion:no-preference){ #focus:not(:empty){animation:drawer .35s var(--ease) both} }
@keyframes drawer{from{transform:translateX(24px);opacity:0}}
.fhead{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:14px}
.fhead b{font-size:22px;font-weight:500;letter-spacing:-.02em}
.fhead .sp{flex:1}
.fhead .pill{display:inline-flex;align-items:center;height:28px;padding:0 10px;font-size:14px;font-weight:500;background:var(--paper);border-radius:var(--r)}
.fhead .pill.good{background:var(--green-25)}
.fhead .pill.bad{background:var(--orange-12)}
.fhead .btn.small{--bg:#fff;--fg:var(--ink);--bd:var(--line-2)}
.fbd{display:block;width:100%;height:50vh;border:1px solid var(--line-2);border-radius:var(--r-lg);background:#fff}
.focusbox .ansrow .btn{min-width:88px}
.quick{display:flex;gap:6px;flex-wrap:wrap;margin-top:12px}
.quick .btn.small{--bg:var(--paper);--bd:var(--paper);--fg:var(--ink);font-weight:500}
.quick .btn.small:hover{--bg:var(--deep-06);--bd:var(--deep)}
#fkick{margin-top:18px!important;--bg:transparent!important;--bd:transparent!important;--fg:var(--orange-ink)!important;padding:0 4px}
#fkick:hover{text-decoration:underline}
@media (max-width:640px){
  #focus{top:auto;height:88dvh;width:100%;border-radius:var(--r-lg) var(--r-lg) 0 0}
  .fbd{height:44dvh}
}

/* the same stage styles serve the connection test */
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);padding:clamp(20px,3vw,32px);box-shadow:var(--shadow-1)}
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--deep);margin-bottom:8px}
.eyebrow i{display:none}

/* ==========================================================================
   v3: question panel, on/off switches, messages
   ========================================================================== */
/* switches in the teacher bar: impossible to misread */
.tog{display:inline-flex;align-items:center;gap:10px;min-height:40px;padding:0 12px 0 8px;border-radius:var(--r);
  background:#fff;border:1.5px solid var(--line-2);color:var(--ink);font-size:14px;font-weight:600;transition:background .15s,border-color .15s}
.tog i{position:relative;width:38px;height:22px;border-radius:11px;background:var(--line-2);flex:none;transition:background .2s}
.tog i::after{content:"";position:absolute;top:3px;left:3px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.25);transition:transform .2s var(--ease)}
.tog .ts{min-width:62px;padding:3px 8px;border-radius:2px;font-size:12.5px;font-weight:600;letter-spacing:.02em;text-align:center;background:var(--paper);color:var(--ink-2)}
.tog:hover{border-color:var(--deep)}
.tog.on{background:#F1FEFA;border-color:var(--green-ink)}
.tog.on i{background:var(--green-ink)}
.tog.on i::after{transform:translateX(16px)}
.tog.on .ts{background:var(--green-ink);color:#fff}

/* two columns on a laptop: the lesson on the left, messages on the right */
.dgrid{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:16px;align-items:start}
.dmain{min-width:0}
.dside{position:sticky;top:calc(var(--top) + env(safe-area-inset-top) + 76px);margin-top:18px}
@media (max-width:1100px){ .dgrid{grid-template-columns:1fr} .dside{position:static;order:-1} }

/* the question the students are looking at */
.qpanel{display:grid;grid-template-columns:minmax(0,1.6fr) minmax(240px,1fr);gap:0;margin-top:18px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1);overflow:hidden}
.qpanel.grid,.qpanel.idle{display:block;padding:16px 18px}
.qp-main{padding:18px 20px}
.qp-k{display:flex;align-items:baseline;gap:12px;flex-wrap:wrap;margin-bottom:10px}
.qp-k .lab{color:var(--deep)}
.qp-t{font-size:16px;font-weight:600;letter-spacing:-.01em}
.qpanel.grid .qp-t,.qpanel.idle .qp-t{font-weight:400;color:var(--ink-2);font-size:15px}
.qp-q{font-size:17px;line-height:1.5}
.qp-svg{margin-top:12px;text-align:center}
.qp-svg svg{max-width:100%;height:auto;max-height:220px}
.qp-svg svg text{font-family:var(--font)}
.qp-side{display:flex;flex-direction:column;gap:12px;padding:18px 20px;background:var(--deep-06);border-left:1px solid var(--line)}
.qp-ans{display:flex;flex-direction:column;gap:6px;padding:12px 14px;background:var(--deep);color:#fff;border-radius:var(--r)}
.qp-ans .lab{color:rgba(255,255,255,.7)}
.qp-ans .v{font-size:22px;font-weight:500}
.qp-rev{display:flex;align-items:center;gap:8px;margin:0;font-size:14px;font-weight:500;color:var(--ink-2)}
.qp-rev::before{content:"";width:10px;height:10px;border-radius:50%;background:var(--grey);flex:none}
.qp-rev.on{color:var(--green-ink)}
.qp-rev.on::before{background:var(--green-ink);box-shadow:0 0 0 3px rgba(11,110,80,.18)}
.qpanel.grid .qp-rev{margin:0 0 12px}
.qp-ext{padding-top:12px;border-top:1px solid var(--line-2);font-size:14.5px;line-height:1.45}
.qp-ext .lab{display:block;margin-bottom:6px}
.qp-ea{margin-top:8px;font-weight:500}
.qp-ea .lab{display:inline;margin-right:6px}
@media (max-width:760px){ .qpanel{grid-template-columns:1fr} .qp-side{border-left:0;border-top:1px solid var(--line)} }
.gqs{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.gqs .gq{display:flex;flex-direction:column;gap:6px;padding:10px 12px;text-align:left;background:var(--paper);border:1px solid transparent;border-radius:var(--r);font-size:13.5px;line-height:1.4;cursor:pointer}
.gqs .gq:hover{border-color:var(--deep);background:#fff}
.gqn{font-weight:600;color:var(--deep);font-size:13px}
.gqn em{font-style:normal;font-weight:400;color:var(--ink-2);margin-left:4px}
.gqq{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.gqs .gq.open .gqq{display:block}
.gqa{margin-top:auto;font-weight:600}
.gqa .lab{font-size:11px;margin-right:4px;color:var(--green-ink)}

/* messages from students */
.mailchip{cursor:pointer}
.mailchip.new{background:var(--orange);border-color:var(--orange)}
@media (prefers-reduced-motion:no-preference){ .mailchip.new{animation:nudge 2.4s var(--ease) infinite} }
@keyframes nudge{0%,80%,100%{transform:none}85%{transform:translateY(-2px)}90%{transform:none}95%{transform:translateY(-1px)}}
.inbox{padding:14px 16px;background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1);max-height:calc(100vh - 180px);overflow:auto;overscroll-behavior:contain}
.ihead{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.ihead .lab{color:var(--deep)}
.badge{display:inline-flex;align-items:center;height:22px;padding:0 8px;font-size:12px;font-weight:600;color:#fff;background:var(--orange);border-radius:2px}
.inbox .muted{font-size:14px}
.ilist{list-style:none;display:flex;flex-direction:column;gap:8px}
.im{padding:10px 12px;background:var(--paper);border-radius:var(--r);border-left:3px solid transparent}
.im.new{background:#FFF5F3;border-left-color:var(--orange)}
.imh{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;font-size:14px}
.imh b{font-weight:600}
.imq{font-size:12px;color:var(--ink-2)}
.imt{margin-left:auto;font-size:12px;color:var(--ink-3)}
.imb{margin:6px 0 8px;font-size:15px;line-height:1.4;overflow-wrap:anywhere}
.ima{display:flex;gap:6px;flex-wrap:wrap}
.ima .btn.small{min-height:32px;font-size:13px;padding:0 10px}
.rw.has-msg .nm::after{content:"";display:inline-block;width:14px;height:12px;margin-left:6px;vertical-align:-1px;background:var(--orange);
  -webkit-mask:var(--i-chat) center/contain no-repeat;mask:var(--i-chat) center/contain no-repeat}
.fnote{margin-bottom:12px;padding:10px 12px;background:#FFF5F3;border-left:3px solid var(--orange);border-radius:var(--r)}
.fnote p{margin-top:4px;font-size:15px}

/* student: the message button and its little panel */
.askbtn{position:fixed;z-index:45;right:max(16px,env(safe-area-inset-right));bottom:max(16px,env(safe-area-inset-bottom));
  display:inline-flex;align-items:center;gap:8px;min-height:44px;padding:0 16px 0 14px;font-size:14.5px;font-weight:600;color:#fff;
  background:var(--deep);border-radius:22px;box-shadow:var(--shadow-2);transition:transform .15s var(--ease),background .15s}
.askbtn::before{content:"";width:18px;height:16px;background:currentColor;-webkit-mask:var(--i-chat) center/contain no-repeat;mask:var(--i-chat) center/contain no-repeat}
.askbtn:hover{background:var(--deep-lo);transform:translateY(-1px)}
.ask{position:fixed;z-index:46;right:max(16px,env(safe-area-inset-right));bottom:calc(max(16px,env(safe-area-inset-bottom)) + 56px);
  width:min(360px,calc(100vw - 32px));padding:16px;background:#fff;border-radius:var(--r-lg);box-shadow:var(--shadow-3);border-top:4px solid var(--deep)}
.askh{display:flex;align-items:center;justify-content:space-between}
.askh b{font-size:17px;font-weight:600}
.askx{width:36px;height:36px;margin:-6px -6px 0 0;font-size:24px;line-height:1;color:var(--ink-2);border-radius:var(--r)}
.askx:hover{background:var(--deep-06)}
.askp{font-size:14px;color:var(--ink-2);margin:2px 0 10px}
.ask textarea.inp{min-height:84px;padding:10px 12px;font-size:16px;font-weight:400;resize:none;line-height:1.4}
.askf{display:flex;align-items:center;justify-content:space-between;margin-top:10px}
.askf .muted{font-size:13px}
@media (prefers-reduced-motion:no-preference){ .ask:not([hidden]){animation:rise .25s var(--ease) both} }
@media (max-width:420px){ .askbtn{padding:0 14px;font-size:14px} }
:root{--i-chat:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 22'%3E%3Cpath d='M2 2h20v14H9l-5 5v-5H2z' fill='%23000'/%3E%3C/svg%3E")}

/* ==========================================================================
   Icons, as masks so they take the colour of whatever they sit in
   ========================================================================== */
:root{
  --i-arrow:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.2' stroke-linecap='square'%3E%3Cpath d='M4 12h15M13 6l6 6-6 6'/%3E%3C/svg%3E");
  --i-open:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.2' stroke-linecap='square'%3E%3Cpath d='M7 17 17 7M9 7h8v8'/%3E%3C/svg%3E");
  --i-x:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.2' stroke-linecap='square'%3E%3Cpath d='M5 5l14 14M19 5 5 19'/%3E%3C/svg%3E");
  --i-edit:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='2.2'%3E%3Cpath d='M4 20h4L19 9l-4-4L4 16z'/%3E%3C/svg%3E");
  --i-tick:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3.2' stroke-linecap='square'%3E%3Cpath d='M5 12.5l4.5 4.5L19 7.5'/%3E%3C/svg%3E");
  --i-cross:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3.2' stroke-linecap='square'%3E%3Cpath d='M7 7l10 10M17 7 7 17'/%3E%3C/svg%3E");
  --i-chev:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23610064' stroke-width='2.4' stroke-linecap='square'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  --i-search:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%238A808E' stroke-width='2.2'%3E%3Ccircle cx='10.5' cy='10.5' r='6.5'/%3E%3Cpath d='M15.5 15.5 21 21'/%3E%3C/svg%3E");
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}
}
@media print{ .top,.tools,.ansrow,#toast,.note{display:none!important} .band{clip-path:none} }
body:has(.stage) .askbtn{background:#fff;color:var(--deep)}
body:has(.stage) .askbtn:hover{background:#F2E8F2}
/* keep the last line of every screen clear of the message button */
body:has(#askbtn:not([hidden])) .stage{padding-bottom:calc(clamp(32px,8vh,96px) + 64px + env(safe-area-inset-bottom))}
body:has(#askbtn:not([hidden])) .wrap{padding-bottom:calc(96px + env(safe-area-inset-bottom))}

/* v4: extension hint (student) and hint line in the teacher's question panel */
.extcard .hintrow{margin-top:14px}
.extcard .hintrow .btn{--bg:transparent;--fg:#fff;--bd:rgba(255,255,255,.55)}
.extcard .hintrow .btn:hover{--bg:rgba(255,255,255,.12);--bd:#fff}
.extcard .hint{margin-top:10px;padding:12px 14px;border-radius:12px;background:rgba(255,255,255,.12);border-left:4px solid var(--pink);font-size:16px;line-height:1.5;color:#fff}
.extcard .hint .lab{display:inline;margin-right:6px;color:#fff;opacity:.85}
.qp-eh{margin-top:8px;font-size:14px;color:var(--ink-2)}
.qp-eh .lab{display:inline;margin-right:6px}
.fsheet{display:inline-block;margin-top:8px;padding:4px 12px;border:1.5px solid currentColor;border-radius:6px;font-size:.88em;opacity:.9}
.extcard .sol .solinner{color:var(--ink)}
.extcard .sol .solinner .step span:last-child{color:var(--ink)}

/* v5: a link out of the waiting and finished screens */
.stage .stagelink{margin-top:clamp(20px,3.5vh,32px)}
.stage .stagelink .btn{display:inline-flex;text-decoration:none}

/* v5: practise any week */
a.chip{text-decoration:none;transition:background .15s}
a.chip:hover{background:rgba(255,255,255,.18)}
.practice .band .pb{flex:1;min-width:0}
.practice .wkinp{max-width:560px;margin-top:4px;font-size:clamp(1.1rem,1rem + .6vw,1.45rem);font-weight:650;min-height:56px;border-color:transparent}
.practice .wkinp:focus{border-color:#fff;box-shadow:0 0 0 4px rgba(255,255,255,.28)}
.pnav{position:relative;z-index:2;display:flex;align-items:center;gap:8px 10px;flex-wrap:wrap;margin:0 0 18px;padding:12px 14px;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow-1)}
.pnav .pqs{display:inline-flex;flex-wrap:wrap;gap:6px}
.pq{position:relative;min-width:40px;height:40px;padding:0 10px;font-size:15px;font-weight:600;color:var(--ink);
  background:#fff;border:1.5px solid var(--line-2);border-radius:var(--r);transition:border-color .15s,background .15s}
.pq:hover{border-color:var(--deep);background:var(--deep-06)}
.pq.on{background:var(--deep);border-color:var(--deep);color:#fff}
.pq.wide{margin-left:auto;padding:0 14px}
.pq.done::after{content:"";position:absolute;top:-5px;right:-5px;width:14px;height:14px;border-radius:50%;background:var(--green-ink) var(--i-tick) center/9px no-repeat;border:2px solid #fff}
.pq.star::after{background-color:var(--pink)}
.prow{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}
.pnext{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:28px;padding-top:18px;border-top:1px solid var(--line)}
.gcell.done{border-color:var(--green-ink)}
@media (max-width:640px){
  .pnav .lab{width:100%}
  .pq.wide{margin-left:0;flex:1 0 100%}
  .pnext .btn{flex:1}
}
/* what to type, for answers with more than one part */
.askline{margin:10px 0 -2px;font-size:15px;color:#610064;font-weight:600}
.extcard .askline{color:#FFD9EC}