/* bl-teach.css - the teacher platform (includes/teachers.php). Theme tokens only, so light and dark both follow
   brainlag.css. One surface per section; inside it, rules and spacing, never a card in a card. */
main.wrap.bt{max-width:1040px;padding-top:28px;padding-bottom:48px}
.bt h1{margin:0 0 8px;font-weight:600}
.bt h2{font-family:var(--f-body);font-weight:600;font-size:22px;letter-spacing:0;margin:0 0 8px}
.bt h3{font-family:var(--f-body);font-weight:600;font-size:17px;margin:26px 0 10px;padding-top:20px;border-top:1px solid var(--rule)}
.bt p{max-width:68ch;line-height:1.55;color:var(--ink-2);margin:0 0 12px}
.bt a{color:var(--study-ink)}
.bt [hidden]{display:none !important}

/* ---------- public page ---------- */
.bt-land h2{margin:40px 0 10px}
.bt-lead{font-size:19px;color:var(--ink) !important}
.bt-cta{margin:20px 0 0 !important}
.bt-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 40px;margin:0}
.bt-grid dt,.bt-faq dt{font-weight:700;color:var(--ink);margin:16px 0 4px}
.bt-grid dd,.bt-faq dd{margin:0;color:var(--ink-2);line-height:1.55;max-width:60ch}
.bt-faq{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 40px;margin:0}
.bt-links{display:flex;flex-wrap:wrap;gap:4px 24px;margin:18px 0 0 !important}
.bt-links a,.bt-a{font-weight:700;display:inline-flex;align-items:center;min-height:44px}
.bt-steps{margin:0;padding-left:22px;max-width:70ch}
.bt-steps li,.bt-list li{margin:0 0 10px;line-height:1.55;color:var(--ink-2)}
.bt-list{margin:0;padding-left:20px;max-width:70ch}
.bt-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 40px}
.bt-soon{font-weight:700;color:var(--ink) !important}
@media (max-width:760px){.bt-grid,.bt-faq,.bt-two{grid-template-columns:1fr}}

/* ---------- app pages ---------- */
.bt-state{color:var(--ink-3)}
.bt-head{margin:0 0 20px}
.bt-sub{color:var(--ink-3) !important;margin:0 !important}
.bt-back{margin:0 0 8px !important}
.bt-back a{font-weight:700;display:inline-flex;align-items:center;min-height:44px}
.bt-back a::before{content:'';width:8px;height:8px;border-left:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);margin-right:10px}
.bt-code{font-family:var(--f-mono);letter-spacing:.06em;color:var(--ink)}
.bt-sec{background:var(--surface);border-radius:var(--r3);box-shadow:var(--shadow);padding:26px 28px;margin:0 0 20px;scroll-margin-top:84px}
.bt-sec:focus{outline:none}
@media (max-width:600px){.bt-sec{padding:20px 16px}}
.bt-big{font:600 20px/1.3 var(--f-body);color:var(--ink) !important}
.bt-note{font-size:14.5px;color:var(--ink-3) !important}
.bt-empty{color:var(--ink-3) !important;margin:6px 0 0 !important}
.bt-foot{margin-top:8px !important}
.bt-row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.bt-hrow{display:flex;flex-wrap:wrap;gap:8px 16px;align-items:center;justify-content:space-between;margin:0 0 12px}
.bt-hrow h2{margin:0}

/* tabs: a plain row of links; scrolls sideways inside itself on a phone, never the page */
.bt-tabs{display:flex;gap:4px;overflow-x:auto;margin:0 0 18px;padding:0 0 2px;border-bottom:1px solid var(--rule);scrollbar-width:thin}
.bt-tabs a{flex:none;display:flex;align-items:center;min-height:44px;padding:0 14px;color:var(--ink-2);font-weight:600;text-decoration:none;border-bottom:3px solid transparent;margin-bottom:-1px}
.bt-tabs a:hover{color:var(--ink)}
.bt-tabs a[aria-current="true"]{color:var(--study-ink);border-bottom-color:var(--study)}

/* forms */
.bt-form{display:grid;gap:14px;max-width:640px}
.bt-form label > span{display:block;font-size:13.5px;font-weight:700;color:var(--ink);margin:0 0 6px}
.bt-form .input,.bt-form .select{width:100%;min-height:48px;box-sizing:border-box;font-size:16px}
.bt-form .b{justify-self:start}
.bt-inline{grid-template-columns:minmax(0,1fr) auto;align-items:end;margin-top:18px}
.bt-row2{display:grid;grid-template-columns:200px minmax(0,1fr);gap:14px}
@media (max-width:600px){.bt-inline,.bt-row2{grid-template-columns:1fr}}
.bt-check{display:flex;gap:10px;align-items:flex-start;line-height:1.45;cursor:pointer;color:var(--ink-2)}
.bt-check input{flex:none;width:20px;height:20px;margin:2px 0 0;accent-color:var(--study)}
.bt-check span{font-weight:400 !important;font-size:15.5px !important;color:var(--ink-2) !important;margin:0 !important}
.bt-codein{font-family:var(--f-mono);letter-spacing:.08em;text-transform:uppercase}
.bt-msg{min-height:1.4em;margin:0 !important;font-weight:600}
.bt-msg.err{color:var(--bad)}
.bt-msg.ok{color:var(--ok)}
.bt-msg:empty{min-height:0}

/* rows */
.bt-rows{list-style:none;margin:0;padding:0}
.bt-rows > li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 16px;align-items:center;padding:14px 0;border-bottom:1px solid var(--rule)}
.bt-rows > li:last-child{border-bottom:0}
.bt-rows .t{font-weight:700;color:var(--ink);overflow-wrap:anywhere}
.bt-rows a.t{text-decoration:none}
.bt-rows a.t:hover{text-decoration:underline;text-underline-offset:3px}
.bt-rows .d{display:block;font-size:14px;color:var(--ink-3);margin-top:3px;line-height:1.45}
.bt-rows .d b{color:var(--ink-2);font-weight:600}
.bt-rows .acts{display:flex;flex-wrap:wrap;gap:8px 14px;justify-content:flex-end;align-items:center}
.bt-rows .full{grid-column:1 / -1}
.bt-tag{display:inline-block;font-size:12.5px;font-weight:700;color:var(--ink-3);margin-left:8px}
.bt-tag.plus{color:var(--study-ink)}
.bt-od{color:var(--bad) !important;font-weight:700}
.bt-ask{grid-column:1 / -1;display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;padding:12px 0 0}
.bt-ask p{margin:0;font-weight:600;color:var(--ink)}
.bt-acts{display:flex;flex-wrap:wrap;gap:12px 16px;margin:22px 0 0;padding-top:18px;border-top:1px solid var(--rule)}
.bt-acts > div{display:grid;gap:8px}
.bt-danger{color:var(--bad) !important}

/* results */
.bt-seg{max-width:420px;margin:0 0 14px}
.bt-res details{border-bottom:1px solid var(--rule)}
.bt-res details:last-child{border-bottom:0}
.bt-res summary{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:4px 14px;align-items:center;padding:14px 0;cursor:pointer;list-style:none}
.bt-res summary::-webkit-details-marker{display:none}
.bt-res summary .t{font-weight:700;color:var(--ink);overflow-wrap:anywhere}
.bt-res summary .d{display:block;font-size:14px;color:var(--ink-3);margin-top:2px}
.bt-res summary::after{content:'';width:8px;height:8px;border-right:2px solid var(--ink-3);border-bottom:2px solid var(--ink-3);transform:rotate(45deg);grid-column:2;grid-row:1;justify-self:end;margin-right:4px}
.bt-res details[open] summary::after{transform:rotate(-135deg)}
.bt-res .sm{display:flex;align-items:center;gap:10px;grid-column:2;grid-row:1;margin-right:26px}
.bt-lines{list-style:none;margin:0 0 12px;padding:0}
.bt-lines li{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:2px 14px;align-items:center;padding:8px 0 8px 14px;border-left:3px solid var(--rule)}
.bt-lines .n{color:var(--ink);font-weight:600;overflow-wrap:anywhere}
.bt-lines .s{font-size:14px;color:var(--ink-3);text-align:right}
@media (max-width:600px){.bt-lines li{grid-template-columns:1fr}.bt-lines .s{text-align:left}}

/* RAG: a square with its letter, so it never depends on colour alone */
.rag{display:inline-flex !important;align-items:center;justify-content:center;box-sizing:border-box;width:26px;height:26px;min-width:26px;padding:0;
  border-radius:6px;font:700 12.5px/1 var(--f-body);font-variant-numeric:tabular-nums;text-align:center;color:#fff;flex:none;vertical-align:middle}
/* contrast (WCAG AA, checked): light R white on #c0362c 5.5, G white on #13804f 5.0, A #2b1d00 on #e9a21a 7.6;
   dark #04161c on #ff8a80 8.1, on #3fd59a 9.9, on #ffc23d 11.5 */
.rag.r{background:var(--bad)}
.rag.a{background:#e9a21a;color:#2b1d00}
:root[data-theme="dark"] .rag.a{background:#ffc23d}
:root[data-theme="dark"] .rag.r,:root[data-theme="dark"] .rag.g{color:#04161c}
.rag.g{background:var(--ok)}
.rag.n{background:var(--sunk);color:var(--ink-3)}
.bt-key{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0 0 14px;font-size:14px;color:var(--ink-3)}
.bt-key > span{display:inline-flex;align-items:center;gap:8px}
.bt-scroll{overflow-x:auto;margin:0 -4px;padding:0 4px 4px}
.bt-grid-t{border-collapse:collapse;font-size:14.5px;min-width:100%}
.bt-grid-t th,.bt-grid-t td{padding:8px 10px;border-bottom:1px solid var(--rule);text-align:center;vertical-align:middle}
.bt-grid-t th{font-size:13px;color:var(--ink-3);font-weight:700;white-space:nowrap}
.bt-grid-t th:first-child,.bt-grid-t td:first-child{text-align:left;position:sticky;left:0;background:var(--surface);min-width:180px;max-width:280px;white-space:normal;color:var(--ink);font-weight:600}
.bt-grid-t .cnt{font-size:13px;color:var(--ink-3);white-space:nowrap}

/* join sheet preview */
.bt-sheet{max-width:420px;margin:18px 0 0;border-radius:var(--r1);overflow:hidden;box-shadow:var(--shadow);background:#fff}
.bt-sheet svg{display:block;width:100%;height:auto}
.bt-printonly{display:none}
@media print{
  body.bt-printing > *:not(.bt-printhost){display:none !important}
  body.bt-printing .bt-printhost{display:block !important}
  body.bt-printing .bt-printhost svg{width:210mm;height:297mm}
  @page{size:A4;margin:0}
}

/* ---------- live quiz (bl-quiz.js) ----------
   Ours, not a game show: one calm surface, letters for answers (no coloured shapes), the brand teal for what is
   picked and right, Noodle and a friend reacting at their fixed size, a slow bar in place of a countdown. */
.qz-h{font-size:30px}
.qz-radios{border:0;margin:0;padding:0;display:grid;gap:10px}
.qz-radios legend{font-size:13.5px;font-weight:700;color:var(--ink);margin:0 0 8px;padding:0}
.qz-stage{background:var(--surface);border-radius:var(--r3);box-shadow:var(--shadow);padding:24px 28px 28px;margin:0 0 20px}
@media (max-width:600px){.qz-stage{padding:18px 16px 22px}}
.qz-top{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:8px 16px;margin:0 0 14px;padding:0 0 12px;border-bottom:1px solid var(--rule)}
.qz-topr{display:flex;align-items:center;gap:16px}
.qz-src{margin:0 !important;font-weight:700;color:var(--ink-3) !important}
.qz-mute{font-size:14px}
.qz-lobby{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:24px;align-items:center}
@media (max-width:700px){.qz-lobby{grid-template-columns:1fr}}
.qz-code{font:700 clamp(44px,9vw,84px)/1 var(--f-mono);letter-spacing:.08em;color:var(--ink) !important;margin:6px 0 10px !important}
.qz-join{font-size:18px;color:var(--ink) !important}
.qz-count{font-weight:700;color:var(--ink-2) !important;margin:14px 0 !important}
.qz-qr{background:#fff;border-radius:var(--r2);padding:10px;box-shadow:var(--shadow);max-width:260px}
.qz-qr svg{display:block;width:100%;height:auto}
.qz-cast{display:flex;align-items:flex-end;justify-content:center;gap:8px;margin:18px 0 0}
.qz-noodle{width:120px;height:120px;flex:none}
.qz-friend{width:110px;height:auto;flex:none}
.qz-grid{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:24px;align-items:start}
@media (max-width:860px){.qz-grid{grid-template-columns:1fr}.qz-grid .qz-cast{order:-1;justify-content:flex-start;margin:0}}
.qz-of{font-size:14px;font-weight:700;color:var(--ink-3) !important;margin:0 0 6px !important}
.qz-title{font-weight:700;color:var(--ink-2) !important;margin:0 0 6px !important}
.qz-stem p,.qz-prompt p{color:var(--ink) !important;max-width:70ch}
.qz-prompt{font-size:21px;font-weight:600;line-height:1.4}
.qz-prompt p{margin:0 0 10px}
.qz-choices{list-style:none;margin:14px 0 0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
@media (max-width:600px){.qz-choices{grid-template-columns:1fr}}
.qz-choices li{display:flex;align-items:center;gap:12px}
.qz-static li{padding:14px 16px;border:2px solid var(--rule-2);border-radius:var(--r2);font-size:19px;color:var(--ink)}
.qz-choice{display:flex;align-items:center;gap:14px;width:100%;min-height:64px;padding:12px 16px;border:2px solid var(--rule-2);border-radius:var(--r2);background:var(--surface);color:var(--ink);font:600 18px/1.3 var(--f-body);text-align:left;cursor:pointer}
.qz-choice:hover{border-color:var(--blue)}
.qz-choice.on{border-color:var(--study);background:var(--study-tint)}
.qz-choice:focus-visible{outline:3px solid var(--study-ink);outline-offset:2px}
.qz-choice:disabled{opacity:.6;cursor:default}
.qz-let{flex:none;display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:8px;background:var(--sunk);color:var(--ink);font:700 15px/1 var(--f-body)}
.qz-choice.on .qz-let{background:var(--study);color:#fff}
:root[data-theme="dark"] .qz-choice.on .qz-let{color:#04161c}
.qz-ct{min-width:0;overflow-wrap:anywhere}
.qz-time{height:8px;border-radius:8px;background:var(--sunk);overflow:hidden;margin:16px 0 0}
.qz-time span{display:block;height:100%;background:var(--study);transform-origin:left center;opacity:.7}
@media (prefers-reduced-motion:reduce){.qz-time span{transition:none !important}}
.qz-note{min-height:1.4em;font-weight:600;color:var(--ink-2) !important;margin:14px 0 0 !important}
.qz-sub{font-size:16px !important;border-top:0 !important;padding-top:0 !important;margin:20px 0 8px !important}
.qz-dist{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.qz-dist li{display:grid;grid-template-columns:auto minmax(0,1fr) auto minmax(80px,30%) 2.5em;align-items:center;gap:10px;padding:8px 10px;border-radius:var(--r1)}
.qz-dist li.ok{background:var(--study-tint)}
.qz-dist li.ok .qz-let{background:var(--study);color:#fff}
:root[data-theme="dark"] .qz-dist li.ok .qz-let{color:#04161c}
.qz-dist li.mine:not(.ok){outline:2px dashed var(--rule-2)}
.qz-tick{color:var(--study-ink);display:inline-flex}
.qz-dist li:not(.ok) .qz-ct + .qz-bar{grid-column:4}
.qz-bar{height:10px;border-radius:10px;background:var(--sunk);overflow:hidden;grid-column:4}
.qz-bar span{display:block;height:100%;background:var(--ink-3);border-radius:10px}
.qz-dist li.ok .qz-bar span{background:var(--study)}
.qz-n{text-align:right;font-variant-numeric:tabular-nums;font-weight:700;color:var(--ink-2)}
@media (max-width:600px){.qz-dist li{grid-template-columns:auto minmax(0,1fr) auto 2.5em}.qz-bar{grid-column:2 / 4;grid-row:2}.qz-dist li:not(.ok) .qz-ct + .qz-bar{grid-column:2 / 4}.qz-n{grid-column:4;grid-row:1}}
.qz-sol{margin:18px 0 0;padding:14px 18px;border-left:4px solid var(--study);background:var(--study-tint);border-radius:0 var(--r1) var(--r1) 0}
.qz-sol h3{margin:0 0 6px !important;padding:0 !important;border:0 !important;font-size:15px !important}
.qz-sol p{margin:0 0 4px !important;line-height:1.5;color:var(--ink) !important}
.qz-say{font-weight:600;color:var(--ink) !important;margin:12px 0 0 !important}
.qz-wait,.qz-res{display:grid;justify-items:center;text-align:center;gap:6px;padding:10px 0}
.qz-big{font:600 22px/1.35 var(--f-body);color:var(--ink) !important;margin:8px 0 !important}
.qz-end h2{margin:0 0 6px}
.qz-board{margin:20px 0 0}
.qz-board h3{font-size:16px !important;border-top:0 !important;padding-top:0 !important;margin:0 0 8px !important}
.qz-names{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px 20px;font-weight:700;font-size:19px;color:var(--ink)}
.qz-teams li{grid-template-columns:minmax(0,1fr) minmax(80px,40%) 3em}
.qz-teams .qz-bar{grid-column:2}
@media (max-width:600px){.qz-teams li{grid-template-columns:minmax(0,1fr) 3em}.qz-teams .qz-bar{grid-column:1 / 3;grid-row:2}.qz-teams .qz-n{grid-column:2;grid-row:1}}