:root{
  --paper:#E9EFE6; --panel:#FAFCF8; --grid:#DCE6D6; --ink:#1B2733; --muted:#566574; --line:#C6D3C0;
  --accent:#1F5F8B; --accent-soft:#DCE9F3; --good:#2A7A4B; --good-bg:#E0F0E5; --bad:#A93A2E; --bad-bg:#F6E2DE;
  --mark:#F1D54E; --hon:#5E3C99;
  --ui:"Bricolage Grotesque", "Segoe UI", system-ui, -apple-system, sans-serif;
  --math:"Source Serif 4", Georgia, "Times New Roman", serif;
  box-sizing:border-box;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --paper:#11171C; --panel:#182129; --grid:#1F2B35; --ink:#E4EAEE; --muted:#9AA8B4; --line:#2C3A46;
    --accent:#6DB3DF; --accent-soft:#1E3444; --good:#6CC592; --good-bg:#17301F; --bad:#EE8A7C; --bad-bg:#3A1F1B;
    --mark:#E4C53A; --hon:#B69CF0;
  }
}
:root[data-theme="dark"]{
  --paper:#11171C; --panel:#182129; --grid:#1F2B35; --ink:#E4EAEE; --muted:#9AA8B4; --line:#2C3A46;
  --accent:#6DB3DF; --accent-soft:#1E3444; --good:#6CC592; --good-bg:#17301F; --bad:#EE8A7C; --bad-bg:#3A1F1B;
  --mark:#E4C53A; --hon:#B69CF0;
}
html{scroll-padding-top:env(safe-area-inset-top,0px);-webkit-text-size-adjust:100%;text-size-adjust:100%}
*,*::before,*::after{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--ui);font-size:16px;line-height:1.5;-webkit-tap-highlight-color:transparent}
button{font:inherit;color:inherit;touch-action:manipulation}
a{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}

.wrap{max-width:1200px;margin:0 auto;padding:18px 20px 48px}
header.top{padding:4px 0 20px;border-bottom:2px solid var(--ink);margin-bottom:24px}
.course{margin-bottom:16px}
.course button{padding:9px 18px;font-size:15px}
.headrow{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:16px 24px}
.brand h1{font-family:var(--math);font-weight:600;font-size:clamp(28px,4.2vw,44px);line-height:1.05;margin:0;letter-spacing:-.01em}
.brand h1 i{font-weight:400}
.brand p{margin:6px 0 0;color:var(--muted);max-width:56ch}
.controls{display:flex;flex-wrap:wrap;gap:12px 20px;align-items:center}
.seg{display:inline-flex;border:1.5px solid var(--ink);border-radius:999px;overflow:hidden}
.seg button{background:none;border:0;padding:7px 14px;cursor:pointer;font-weight:600;font-size:14px;min-height:40px}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--panel)}
.stats{display:flex;gap:18px;font-size:14px;color:var(--muted)}
.stats b{display:block;font-size:22px;color:var(--ink);font-weight:800;line-height:1.1;font-variant-numeric:tabular-nums}

.layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:28px;align-items:start}
nav.topics{position:sticky;top:calc(env(safe-area-inset-top,0px) + 76px);max-height:calc(100vh - 90px);overflow:auto}
.sheethead{display:none}
.tlist{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:2px}
.gh{font-size:13px;font-weight:600;color:var(--muted);padding:14px 10px 4px}
.gh:first-child{padding-top:0}
.tbtn{width:100%;text-align:left;background:none;border:0;border-radius:8px;padding:8px 10px;cursor:pointer;display:grid;grid-template-columns:1fr auto;gap:2px 10px;align-items:center}
.tbtn:hover{background:var(--accent-soft)}
.tbtn[aria-current="true"]{background:var(--ink);color:var(--panel)}
.tbtn .nm{font-size:15px;font-weight:600;line-height:1.25}
.tbtn .ct{font-size:12px;opacity:.75;font-variant-numeric:tabular-nums}
.meter{grid-column:1/-1;height:4px;border-radius:2px;background:var(--line);overflow:hidden}
.meter span{display:block;height:100%;background:var(--good);width:0}
.tbtn[aria-current="true"] .meter{background:rgba(255,255,255,.25)}
.reset{margin-top:14px;background:none;border:0;color:var(--muted);font-size:13px;text-decoration:underline;cursor:pointer;padding:6px 10px}
.backdrop{display:none}

.bar{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}
.bar h2{margin:0;font-size:20px;font-weight:800}
.topicbtn{display:none}
.card{background-color:var(--panel);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:26px 26px;background-position:-1px -1px;
  border:1.5px solid var(--ink);border-radius:4px;padding:26px clamp(18px,4vw,40px) 28px;box-shadow:6px 6px 0 var(--line)}
.meta{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;font-size:13px;color:var(--muted);margin-bottom:14px}
.pill{display:inline-block;border:1px solid currentColor;border-radius:999px;padding:1px 9px;font-weight:600}
.pill.hon{color:var(--hon)}
.pill.sec{color:var(--accent)}
.clock{font-variant-numeric:tabular-nums;font-weight:600}
.q{font-family:var(--math);font-size:clamp(19px,2.3vw,22px);line-height:1.55;max-width:62ch}
.q .eq{font-size:1.35em;margin:14px 0 4px;overflow-x:auto;padding:4px 0}
.q .eq.small{font-size:1.05em}
.psg{font-size:clamp(17px,2vw,19px);line-height:1.7;background:var(--panel);border:1px solid var(--line);border-radius:6px;padding:14px 16px;max-width:64ch}
.psg ul{margin:6px 0 0;padding-left:20px}
.psg li{margin:4px 0}
.psg .src{display:block;font-family:var(--ui);font-size:13px;color:var(--muted);margin-bottom:6px}
.stem{font-family:var(--ui);font-size:16px;font-weight:600;margin:16px 0 0;line-height:1.45}
.blank{display:inline-block;width:3.2em;border-bottom:2px solid currentColor;vertical-align:baseline;margin:0 .15em}
.dt{border-collapse:collapse;font-family:var(--ui);font-size:15px;margin:12px 0 4px;background:var(--panel)}
.dt th,.dt td{border:1px solid var(--line);padding:6px 10px;text-align:center}
.dt th{font-weight:600}
.dt td:first-child,.dt th:first-child{text-align:left}
.tscroll{overflow-x:auto;max-width:100%}
.choices{display:grid;gap:10px;margin:22px 0 0;max-width:760px}
.ch{display:grid;grid-template-columns:34px 1fr;align-items:center;gap:12px;text-align:left;cursor:pointer;min-height:52px;
  background:var(--panel);border:1.5px solid var(--line);border-radius:8px;padding:10px 14px;font-family:var(--math);font-size:19px;line-height:1.4;overflow-x:auto}
.ch.txt{font-size:17px}
.ch:hover:not([disabled]){border-color:var(--ink)}
.ch .k{font-family:var(--ui);font-weight:800;font-size:14px;width:28px;height:28px;border-radius:50%;border:1.5px solid currentColor;display:grid;place-items:center}
.ch[disabled]{cursor:default}
.ch.right{border-color:var(--good);background:var(--good-bg)}
.ch.right .k{background:var(--good);border-color:var(--good);color:var(--panel)}
.ch.wrong{border-color:var(--bad);background:var(--bad-bg)}
.ch.wrong .k{background:var(--bad);border-color:var(--bad);color:var(--panel)}
.ch.dim{opacity:.55}
.gridin{margin-top:22px;max-width:420px}
.gridin label{display:block;font-weight:600;font-size:15px;margin-bottom:6px}
.girow{display:flex;gap:8px}
.gridin input{flex:1;min-width:0;font-family:var(--math);font-size:22px;padding:8px 12px;border:1.5px solid var(--ink);border-radius:8px;background:var(--panel);color:var(--ink);min-height:50px}
.gridin.right input{border-color:var(--good);background:var(--good-bg)}
.gridin.wrong input{border-color:var(--bad);background:var(--bad-bg)}
.kbtn{min-width:50px;min-height:50px;border:1.5px solid var(--line);border-radius:8px;background:var(--panel);font-family:var(--math);font-size:22px;cursor:pointer}
.kbtn[disabled]{opacity:.4}
.gridin small{display:block;color:var(--muted);font-size:13px;margin-top:6px}
.gridin small.err{color:var(--bad);font-weight:600}
.actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px;align-items:center}
.btn{border:1.5px solid var(--ink);background:var(--panel);border-radius:999px;padding:9px 18px;font-weight:600;cursor:pointer;min-height:44px}
.btn.primary{background:var(--ink);color:var(--panel)}
.btn[disabled]{opacity:.4;cursor:default}
.keys{font-size:12px;color:var(--muted);margin-left:auto}
.hint{margin-top:18px;padding:10px 14px;border-left:4px solid var(--mark);background:color-mix(in srgb,var(--mark) 16%,var(--panel));font-size:15px;max-width:720px}
.hint .h{font-weight:800;margin-right:6px}
.fb{margin-top:18px;font-weight:800;font-size:17px}
.fb.ok{color:var(--good)} .fb.no{color:var(--bad)}
.sol{margin-top:10px;max-width:720px;background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:14px 18px}
.sol h3{margin:0 0 6px;font-size:15px}
.sol ol{margin:0;padding-left:22px;font-family:var(--math);font-size:17px;line-height:1.7}
.sol li{padding-left:4px;overflow-x:auto}
.sol p{margin:0;font-size:16px;line-height:1.6}

.learn{margin-top:26px;display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:22px;padding-top:18px;border-top:1px solid var(--line)}
.learn h3{margin:0 0 6px;font-size:16px}
.learn p{margin:0;color:var(--muted);max-width:60ch}
.links{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.links a{font-weight:600;text-decoration:none;border-bottom:1.5px solid color-mix(in srgb,var(--accent) 40%,transparent)}
.links a:hover{border-bottom-color:var(--accent)}
.links small{display:block;color:var(--muted);font-size:13px}

.summary .big{font-family:var(--math);font-size:clamp(48px,8vw,72px);line-height:1;font-weight:600}
.summary table{border-collapse:collapse;margin:14px 0;font-size:15px;min-width:280px}
.summary td,.summary th{padding:6px 12px 6px 0;border-bottom:1px solid var(--line);text-align:left}
.summary td:last-child{text-align:right;font-variant-numeric:tabular-nums}
.missed{margin-top:10px;display:flex;flex-direction:column;gap:10px}
.missed>div{background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:10px 14px;font-family:var(--math);overflow-x:auto}
.missed .ans{color:var(--good);font-weight:600}
.missed .psg{border:0;padding:0;font-size:16px}
.missed .stem{font-size:15px}

/* math typesetting */
.fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;font-size:.86em;margin:0 .12em;line-height:1.15}
.fr>span:first-child{border-bottom:1px solid currentColor;padding:0 .25em .05em}
.fr>span:last-child{padding:.05em .25em 0}
.rad{border-top:1.2px solid currentColor;padding:0 .15em 0 .08em}
.fn{font-style:normal}
.sig{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;line-height:1;margin-right:.15em;font-size:.8em}
.sig .s{font-size:1.7em;line-height:1}
sup,sub{font-size:.68em;line-height:0}
i{font-style:italic}

@media (max-width:880px){
  .wrap{padding:10px 12px 32px}
  header.top{padding-bottom:14px;margin-bottom:14px}
  .course{display:flex;width:100%;margin-bottom:12px}
  .course button{flex:1;min-height:44px}
  .brand h1{font-size:28px}
  .brand p{font-size:14px}
  .controls{width:100%;gap:10px}
  .controls .seg{flex:1}
  .controls .seg button{flex:1;padding:7px 8px}
  .stats{width:100%;justify-content:space-between}
  .long{display:none}
  .layout{grid-template-columns:1fr;gap:0}
  nav.topics{position:fixed;left:0;right:0;bottom:0;top:auto;max-height:82vh;overflow:auto;background:var(--panel);
    border-top:2px solid var(--ink);border-radius:16px 16px 0 0;padding:6px 14px calc(18px + env(safe-area-inset-bottom,0px));
    transform:translateY(105%);visibility:hidden;transition:transform .25s ease,visibility .25s;z-index:30;overscroll-behavior:contain}
  nav.topics.open{transform:none;visibility:visible}
  .sheethead{display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;background:var(--panel);padding:10px 0 6px;z-index:1}
  .sheethead b{font-size:17px}
  .backdrop{position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:20}
  .backdrop.show{display:block}
  .tbtn{min-height:52px}
  .topicbtn{display:inline-flex;align-items:center;gap:6px;border:1.5px solid var(--ink);background:var(--panel);border-radius:999px;padding:8px 14px;font-weight:600;min-height:44px;cursor:pointer}
  .bar h2{font-size:18px}
  .card{padding:18px 16px 0;box-shadow:4px 4px 0 var(--line)}
  .q{font-size:19px}
  .psg{padding:12px 13px}
  .ch{font-size:18px;padding:10px 12px}
  .actions{position:sticky;bottom:0;margin:20px -16px 0;padding:12px 16px calc(12px + env(safe-area-inset-bottom,0px));
    background:var(--panel);border-top:1px solid var(--line);flex-wrap:nowrap;z-index:5}
  .actions .btn{flex:1;padding:9px 10px;font-size:15px}
  .summary .actions{margin-top:20px}
  .learn{grid-template-columns:1fr;margin-top:20px}
  .keys{display:none}
}
@media (prefers-reduced-motion: no-preference){
  .card.enter{animation:rise .28s ease-out}
  @keyframes rise{from{transform:translateY(6px);opacity:.3}to{transform:none;opacity:1}}
}
@media (prefers-reduced-motion: reduce){ nav.topics{transition:none} }

/* ================= app shell ================= */
[hidden]{display:none !important}
.appbar{position:sticky;top:0;z-index:15;background:var(--paper);border-bottom:2px solid var(--ink);padding-top:env(safe-area-inset-top,0px)}
.appbar .in{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:18px;padding:10px 20px}
.logo{font-family:var(--math);font-weight:600;font-size:20px;text-decoration:none;color:var(--ink);white-space:nowrap}
.logo i{font-weight:400}
.navlinks{display:flex;gap:4px;flex:1;flex-wrap:wrap}
.navlinks a{padding:8px 14px;border-radius:999px;text-decoration:none;color:var(--ink);font-weight:600;font-size:15px}
.navlinks a:hover{background:var(--accent-soft)}
.navlinks a[aria-current="page"]{background:var(--ink);color:var(--panel)}
.who{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--muted);margin-left:auto}
.who .rp{border:1px solid currentColor;border-radius:999px;padding:1px 8px;font-weight:600;font-size:12px}
.who .btn{min-height:36px;padding:6px 14px;font-size:14px}
.tabbar{display:none}
.view{max-width:1200px;margin:0 auto;padding:18px 20px 48px}
#view-practice .wrap{padding-top:18px}

/* ================= generic view pieces ================= */
.vh{font-family:var(--math);font-weight:600;font-size:clamp(26px,3.6vw,38px);line-height:1.1;margin:6px 0 6px;letter-spacing:-.01em}
.lede{color:var(--muted);margin:0 0 22px;max-width:62ch}
.panel{background:var(--panel);border:1.5px solid var(--ink);border-radius:4px;padding:18px 20px;margin-bottom:18px}
.panel h2{font-size:17px;margin:0 0 12px}
.panel p{margin:0 0 10px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:14px}
.ccard{background:var(--panel);border:1.5px solid var(--line);border-radius:8px;padding:16px;display:flex;flex-direction:column;gap:8px}
.ccard h3{margin:0;font-size:18px}
.ccard .sub{color:var(--muted);font-size:14px}
.ccard .acts{display:flex;gap:8px;flex-wrap:wrap;margin-top:auto;padding-top:6px}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px;margin-bottom:18px}
.tile{background:var(--panel);border:1.5px solid var(--line);border-radius:8px;padding:12px 14px}
.tile b{display:block;font-size:28px;font-weight:800;line-height:1.1;font-variant-numeric:tabular-nums}
.tile span{font-size:13px;color:var(--muted)}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field label{font-weight:600;font-size:14px}
.inp{font:inherit;font-size:16px;padding:10px 12px;border:1.5px solid var(--ink);border-radius:8px;background:var(--panel);color:var(--ink);min-height:46px;width:100%}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:flex-end}
.row .field{flex:1;min-width:180px;margin-bottom:0}
.formerr{color:var(--bad);font-weight:600;font-size:14px;margin:8px 0 0;min-height:1.2em}
.help{color:var(--muted);font-size:13px}
.tbl{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
.tbl th,.tbl td{text-align:left;padding:10px 8px;border-bottom:1px solid var(--line);vertical-align:middle}
.tbl th{font-size:13px;color:var(--muted);font-weight:600}
.tbl .num{font-variant-numeric:tabular-nums;white-space:nowrap}
.linkbtn{background:none;border:0;color:var(--accent);font-weight:600;cursor:pointer;padding:4px 0;text-decoration:underline;font-size:14px}
.linkbtn.danger,.btn.danger{color:var(--bad)}
.btn.danger{border-color:var(--bad)}
.back{background:none;border:0;color:var(--accent);font-weight:600;cursor:pointer;padding:6px 0;font-size:15px}
.bigcode{font-family:var(--math);font-size:34px;font-weight:600;letter-spacing:.14em;font-variant-numeric:tabular-nums;margin:2px 0 8px}
.bars{display:flex;align-items:flex-end;gap:4px;height:100px;padding-top:6px}
.bars span{flex:1;background:var(--accent);border-radius:3px 3px 0 0;min-height:3px}
.bars span.z{background:var(--line)}
.barlabels{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:6px}
.mbar{height:6px;background:var(--line);border-radius:3px;overflow:hidden;min-width:70px;max-width:160px}
.mbar span{display:block;height:100%;background:var(--good)}
.empty{color:var(--muted);margin:4px 0}
.ok{color:var(--good);font-weight:600}.no{color:var(--bad);font-weight:600}
.recent{list-style:none;margin:0;padding:0}
.recent li{display:flex;justify-content:space-between;gap:10px;padding:8px 0;border-bottom:1px solid var(--line);font-size:15px}
.recent li span:last-child{color:var(--muted);font-size:13px;white-space:nowrap}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 16px}
.chip{border:1.5px solid var(--ink);background:var(--panel);border-radius:999px;padding:6px 14px;font-weight:600;cursor:pointer;min-height:38px}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--panel)}
.banner{background:var(--accent-soft);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:14px;margin:0 0 14px}
.sectionh{font-size:18px;margin:26px 0 10px}

/* ================= videos ================= */
.vgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:14px}
.vid{display:flex;flex-direction:column;background:var(--panel);border:1.5px solid var(--line);border-radius:8px;overflow:hidden}
.vid:hover{border-color:var(--ink)}
.vopen{display:flex;flex-direction:column;text-align:left;background:none;border:0;padding:0;cursor:pointer;width:100%}
.thumb{position:relative;display:block;aspect-ratio:16/9;background:var(--ink);overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.play{position:absolute;left:50%;top:50%;width:54px;height:38px;margin:-19px 0 0 -27px;border-radius:10px;background:rgba(0,0,0,.72)}
.play::after{content:"";position:absolute;left:22px;top:11px;border-left:14px solid #fff;border-top:8px solid transparent;border-bottom:8px solid transparent}
.vph{display:grid;place-items:center;height:100%;color:var(--paper);font-weight:800;font-size:18px;padding:10px;text-align:center}
.vt{font-weight:600;font-size:15px;line-height:1.3;padding:10px 12px 2px}
.vs{font-size:12px;color:var(--muted);padding:0 12px 10px}
.vdel{align-self:flex-start;margin:0 12px 10px;background:none;border:0;color:var(--bad);font-weight:600;font-size:13px;text-decoration:underline;cursor:pointer;padding:2px 0}
.learn{display:block}
.learn-v{margin-bottom:20px}
.learn-v .vgrid{grid-template-columns:repeat(auto-fill,minmax(190px,1fr))}
.learn-2{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(0,1fr);gap:22px}
.preview{display:flex;gap:12px;align-items:center;margin:0 0 14px}
.preview img{width:160px;aspect-ratio:16/9;object-fit:cover;border-radius:6px;border:1px solid var(--line)}
.modal{position:fixed;inset:0;z-index:60;background:rgba(0,0,0,.75);display:none;align-items:center;justify-content:center;padding:calc(12px + env(safe-area-inset-top,0px)) 12px calc(12px + env(safe-area-inset-bottom,0px))}
.modal.show{display:flex}
.modal .box{width:min(980px,100%);background:var(--panel);border-radius:8px;overflow:hidden}
.modal .frame{aspect-ratio:16/9;background:#000}
.modal iframe{width:100%;height:100%;border:0;display:block}
.modal .mfoot{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:10px 14px;flex-wrap:wrap}
.modal .mfoot b{font-size:15px}
.modal .mfoot div{display:flex;gap:12px;align-items:center}

/* ================= auth ================= */
.auth{min-height:100vh;min-height:100dvh;display:grid;place-items:center;padding:calc(24px + env(safe-area-inset-top,0px)) 16px calc(24px + env(safe-area-inset-bottom,0px));
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:26px 26px}
.authcard{width:min(460px,100%);background:var(--panel);border:1.5px solid var(--ink);border-radius:6px;box-shadow:6px 6px 0 var(--line);padding:26px 24px}
.authcard h1{font-family:var(--math);font-weight:600;font-size:32px;margin:0 0 4px;line-height:1.1}
.authcard h1 i{font-weight:400}
.authcard .lede{margin-bottom:18px}
.authtabs{display:flex;margin-bottom:18px}
.authtabs.seg button{flex:1}
.roles{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.roles label{position:relative;border:1.5px solid var(--line);border-radius:8px;padding:10px 6px;text-align:center;cursor:pointer;font-weight:600;font-size:14px}
.roles input{position:absolute;opacity:0;pointer-events:none}
.roles label:has(input:checked){border-color:var(--ink);background:var(--accent-soft)}
.roles label:has(input:focus-visible){outline:3px solid var(--accent);outline-offset:2px}
.roles small{display:block;font-weight:400;color:var(--muted);font-size:12px;margin-top:2px}
.btn.full{width:100%;margin-top:6px}
.toast{position:fixed;left:50%;bottom:calc(24px + env(safe-area-inset-bottom,0px));transform:translateX(-50%);background:var(--ink);color:var(--panel);padding:10px 18px;border-radius:999px;font-weight:600;z-index:80;opacity:0;transition:opacity .2s;pointer-events:none;max-width:90vw;text-align:center}
.toast.show{opacity:1}
.boot{min-height:60vh;display:grid;place-items:center;color:var(--muted)}

@media (max-width:880px){
  .appbar .in{padding:8px 12px;gap:10px}
  .navlinks{display:none}
  .who .nm,.who .rp{display:none}
  .view{padding:12px 12px 32px}
  #view-practice .wrap{padding-top:10px}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:18;background:var(--panel);border-top:1.5px solid var(--ink);padding-bottom:env(safe-area-inset-bottom,0px)}
  .tabbar a{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;padding:7px 2px 6px;font-size:11px;font-weight:600;text-decoration:none;color:var(--muted);min-height:56px}
  .tabbar a[aria-current="page"]{color:var(--ink)}
  .tabbar a[aria-current="page"] svg{stroke-width:2.6}
  .tabbar svg{width:23px;height:23px}
  body.shell{padding-bottom:calc(60px + env(safe-area-inset-bottom,0px))}
  .actions{bottom:calc(58px + env(safe-area-inset-bottom,0px));padding-bottom:12px}
  nav.topics{z-index:40}
  .backdrop{z-index:35}
  .toast{bottom:calc(76px + env(safe-area-inset-bottom,0px))}
  .learn-2{grid-template-columns:1fr}
  .learn-v .vgrid,.vgrid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:10px}
  .panel{padding:16px}
  .roles label{font-size:13px}
}

/* consent */
.consent{display:flex;flex-direction:column;gap:10px;margin:4px 0 16px}
.check{display:grid;grid-template-columns:24px 1fr;gap:10px;align-items:start;font-size:14px;line-height:1.45;cursor:pointer}
.check input{width:22px;height:22px;margin:0;accent-color:var(--ink)}
.authfoot{text-align:center;font-size:13px;margin:14px 0 0}

/* ================= badges & banner ================= */
.badge{display:inline-grid;place-items:center;min-width:18px;height:18px;padding:0 5px;border-radius:999px;background:var(--bad);color:#fff;font-size:11px;font-weight:800;line-height:1;margin-left:6px;vertical-align:middle}
.navlinks a[aria-current="page"] .badge{background:var(--mark);color:#1B2733}
.tabbar .ti{position:relative;display:inline-flex}
.tabbar .ti .badge{position:absolute;top:-6px;right:-12px;margin:0}
.newsbar{background:var(--mark);color:#1B2733;border-bottom:1.5px solid var(--ink)}
.newsbar .in{max-width:1200px;margin:0 auto;padding:8px 20px;display:flex;gap:12px;align-items:center;justify-content:space-between;flex-wrap:wrap;font-size:15px}
.newsbar .help{color:#3a4652}
.newsbar a,.newsbar .linkbtn{color:#1B2733;font-weight:700}
.nb-acts{display:flex;gap:14px;align-items:center}

/* ================= question feedback ================= */
.qfb{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px;margin-top:14px;font-size:14px;color:var(--muted)}
.chip.sm{min-height:34px;padding:4px 12px;font-size:14px}
.qreport{flex-basis:100%;display:flex;flex-direction:column;gap:8px;margin-top:6px;max-width:640px}
.qreport label{font-weight:600;color:var(--ink)}
.qreport textarea,.fedit textarea,#ff textarea,#uf textarea{resize:vertical;line-height:1.45}

/* ================= feedback lists ================= */
.fbl{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.fbl>li{background:var(--panel);border:1.5px solid var(--line);border-radius:8px;padding:14px 16px}
.fbl p{margin:8px 0;white-space:pre-wrap;overflow-wrap:anywhere}
.fbh{display:flex;flex-wrap:wrap;gap:6px 10px;align-items:center}
.spill{display:inline-block;border-radius:999px;padding:1px 9px;font-size:12px;font-weight:700;border:1px solid currentColor}
.s-new{color:var(--bad)}.s-planned{color:var(--accent)}.s-in_progress{color:var(--hon)}.s-done{color:var(--good)}.s-wont_do{color:var(--muted)}
.reply{border-left:4px solid var(--good);background:var(--good-bg);padding:8px 12px;border-radius:0 6px 6px 0;margin-top:8px}
.reply.fresh{border-left-color:var(--mark)}
.reply p{margin:4px 0 0}
.snap{white-space:pre-wrap;font-family:var(--math);font-size:14px;background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:10px;margin:8px 0 0;overflow-wrap:anywhere;max-height:260px;overflow:auto}
details summary{cursor:pointer;font-weight:600;font-size:14px;color:var(--accent);margin-top:4px}
.upd{list-style:none;margin:0;padding:0}
.upd li{padding:12px 0;border-bottom:1px solid var(--line)}
.upd p{margin:6px 0;white-space:pre-wrap}

/* ================= messages ================= */
.chat{display:grid;grid-template-columns:320px minmax(0,1fr);gap:0;border:1.5px solid var(--ink);border-radius:6px;background:var(--panel);height:calc(100dvh - 150px);min-height:460px;overflow:hidden}
.clist{border-right:1.5px solid var(--line);display:flex;flex-direction:column;min-height:0}
.chead{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line)}
.chead .vh{font-size:24px;margin:0}
#convs{overflow:auto;flex:1}
#convs .empty,#plist .empty{padding:14px}
.convs{list-style:none;margin:0;padding:0}
.conv{width:100%;text-align:left;background:none;border:0;border-bottom:1px solid var(--line);padding:11px 14px;cursor:pointer;display:flex;flex-direction:column;gap:2px;min-height:56px}
.conv:hover{background:var(--accent-soft)}
.conv.on{background:var(--accent-soft);box-shadow:inset 3px 0 0 var(--ink)}
.ctop{display:flex;justify-content:space-between;align-items:center;gap:8px}
.csub{font-size:12px;color:var(--muted)}
.cprev{font-size:14px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cthread{display:flex;flex-direction:column;min-height:0;min-width:0}
.cempty{margin:auto;text-align:center;padding:24px;color:var(--muted);max-width:40ch}
.tbar{display:flex;align-items:center;gap:12px;padding:10px 14px;border-bottom:1px solid var(--line)}
.tbar .ttl{display:flex;flex-direction:column;flex:1;min-width:0}
.tbar .back{display:none}
.check.sm{grid-template-columns:20px 1fr;font-size:13px;font-weight:600;white-space:nowrap}
.check.sm input{width:18px;height:18px}
.msgs{flex:1;overflow:auto;padding:14px;display:flex;flex-direction:column;gap:10px;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:26px 26px}
.msgs .older{align-self:center}
.msg{max-width:78%;align-self:flex-start;display:flex;flex-direction:column;gap:3px}
.msg.mine{align-self:flex-end;align-items:flex-end}
.mfrom{font-size:12px;font-weight:700;color:var(--muted)}
.rtag{font-weight:600;border:1px solid currentColor;border-radius:999px;padding:0 6px;font-size:11px;margin-left:4px}
.bubble{background:var(--panel);border:1.5px solid var(--line);border-radius:14px 14px 14px 4px;padding:8px 12px;white-space:pre-wrap;overflow-wrap:anywhere;line-height:1.45;font-size:15px}
.msg.mine .bubble{background:var(--ink);color:var(--panel);border-color:var(--ink);border-radius:14px 14px 4px 14px}
.bubble.gone{font-style:italic;color:var(--muted);background:transparent}
.msg.mine .bubble.gone{background:transparent;color:var(--muted);border-color:var(--line)}
.mmeta{font-size:11px;color:var(--muted)}
.mmeta .linkbtn{font-size:11px;padding:0}
.composer{display:flex;gap:8px;align-items:flex-end;padding:10px 12px 4px;border-top:1px solid var(--line)}
.composer textarea{resize:none;min-height:46px;max-height:140px;line-height:1.4}
.ctip{padding:0 12px 10px;margin:0}
.cnote{padding:12px 14px;margin:0;border-top:1px solid var(--line);color:var(--muted)}
.picker{padding:14px;display:flex;flex-direction:column;gap:10px;overflow:auto}

@media (max-width:880px){
  .newsbar .in{padding:8px 12px;font-size:14px}
  .chat{grid-template-columns:1fr;height:calc(100dvh - 130px - env(safe-area-inset-bottom,0px) - env(safe-area-inset-top,0px));border-radius:4px}
  .chat .cthread{display:none}
  .chat.show-thread .clist{display:none}
  .chat.show-thread .cthread{display:flex}
  .tbar .back{display:inline-block}
  .msg{max-width:88%}
}

/* ================= SSO ================= */
.ssobtns{display:flex;flex-direction:column;gap:10px}
.btn.sso{display:flex;justify-content:center;align-items:center;text-decoration:none;color:var(--ink);background:var(--panel)}
.ordiv{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:13px;margin:16px 0}
.ordiv::before,.ordiv::after{content:"";flex:1;border-top:1px solid var(--line)}

/* ================= levels ================= */
.pill.lvl{border-style:dashed}
.pill.lvl.l1{color:var(--good)}.pill.lvl.l2{color:var(--accent)}.pill.lvl.l3{color:var(--hon)}
.lvsel{min-height:36px;padding:4px 8px;width:auto}

/* ================= AI tutor ================= */
.tutor{margin-top:16px;max-width:760px;background:var(--panel);border:1.5px solid var(--ink);border-radius:8px;overflow:hidden}
.tuhead{display:flex;flex-wrap:wrap;gap:4px 12px;align-items:baseline;padding:10px 14px;border-bottom:1px solid var(--line)}
.tuhead .linkbtn{margin-left:auto}
.tumsgs{max-height:360px;overflow:auto;padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.tum{max-width:90%;border-radius:12px;padding:8px 12px;font-size:15px;line-height:1.5;overflow-wrap:anywhere}
.tum p{margin:0 0 8px}.tum p:last-child{margin:0}
.tum.user{align-self:flex-end;background:var(--ink);color:var(--panel);white-space:pre-wrap}
.tum.assistant{align-self:flex-start;background:var(--accent-soft)}
.tum.busy{color:var(--muted);font-style:italic}
.tuchips{padding:0 14px;margin:0 0 4px}
.tucomp{border-top:0}
.tunote{padding:0 14px 10px;margin:0}

/* ================= quizzes & bank ================= */
.qzhead{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
.ch.picked{border-color:var(--ink);background:var(--accent-soft)}
.ch.picked .k{background:var(--ink);color:var(--panel);border-color:var(--ink)}
.qzrow{align-items:flex-end;margin-bottom:10px}
.qzrow .qrm{margin-bottom:12px}
.bankpick{display:flex;flex-direction:column;gap:8px;max-height:260px;overflow:auto;border:1px solid var(--line);border-radius:8px;padding:10px;background:var(--paper)}
.qbstem{font-size:18px;margin:8px 0}
.qbch{margin:4px 0 10px;padding-left:24px;font-family:var(--math)}
.chrow{align-items:center;margin-bottom:8px}
.chrow input[type=radio]{width:22px;height:22px;accent-color:var(--good)}
.chrow .qec{flex:1}
.qprev{box-shadow:none}
.missed details ol{font-family:var(--math);margin:6px 0 0}

/* Apple's guidelines call for a black (or white) button; swap in Apple's official button artwork before App Store review. */
.btn.sso-apple{background:#000;color:#fff;border-color:#000}
@media (prefers-color-scheme: dark){ :root:not([data-theme="light"]) .btn.sso-apple{background:#fff;color:#000;border-color:#fff} }

/* ================= tutor settings & hand-off ================= */
.modes{display:flex;flex-direction:column;gap:8px}
.modes label{display:grid;grid-template-columns:24px 1fr;gap:10px;align-items:start;border:1.5px solid var(--line);border-radius:8px;padding:12px;cursor:pointer}
.modes label:has(input:checked){border-color:var(--ink);background:var(--accent-soft)}
.modes input{width:20px;height:20px;margin:2px 0 0;accent-color:var(--ink)}
.modes small{display:block;color:var(--muted);font-size:13px;margin-top:2px;line-height:1.4}
.tuhand{padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.tuhand p{margin:0}
.tuhand .chips{margin:0}
.sharebox{margin-top:14px;padding-top:12px;border-top:1px solid var(--line)}

/* ================= admin sign-in setup ================= */
.ssocard .fbh{margin-bottom:10px}
.steps{margin:0 0 14px;padding-left:22px;line-height:1.6}
.steps li{margin:6px 0}
.copyrow{display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;margin:6px 0}
.copyrow code{background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:4px 8px;font-size:13px;overflow-wrap:anywhere}
.btn.sm{min-height:32px;padding:4px 12px;font-size:13px}
.ssonote{text-align:center;margin:0 0 14px}

.agrp{display:flex;flex-wrap:wrap;gap:6px 16px;align-items:center;margin:6px 0 10px}
.agrp b{flex-basis:100%;font-size:14px}

.pill.rev{color:var(--hon);border-style:solid;font-weight:700}
.lesson{margin-top:12px;max-width:720px;border:1.5px solid var(--hon);border-radius:8px;padding:10px 14px;background:color-mix(in srgb,var(--hon) 8%,var(--panel))}
.lesson p{margin:4px 0 0}

/* ================= help chat ================= */
.helpbtn{display:inline-flex;align-items:center;gap:6px}
.helpbtn svg{width:18px;height:18px}
.helppanel{position:fixed;right:16px;bottom:16px;top:calc(76px + env(safe-area-inset-top,0px));width:min(420px,calc(100vw - 32px));z-index:50;background:var(--panel);border:1.5px solid var(--ink);border-radius:10px;box-shadow:6px 6px 0 var(--line);display:flex;flex-direction:column;overflow:hidden}
.hhead{display:flex;align-items:baseline;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line)}
.hhead .linkbtn{margin-left:auto}
.hmsgs{flex:1;overflow:auto;padding:12px 14px;display:flex;flex-direction:column;gap:10px}
.hm{max-width:92%;border-radius:12px;padding:9px 12px;font-size:15px;line-height:1.5;overflow-wrap:anywhere}
.hm.me{align-self:flex-end;background:var(--ink);color:var(--panel)}
.hm.bot{align-self:flex-start;background:var(--accent-soft)}
.hm p{margin:6px 0 0}.hm ol,.hm ul{margin:6px 0 0;padding-left:20px}.hm li{margin:3px 0}
.hm .hnotes{font-size:13px;color:var(--muted)}
.hm blockquote{margin:8px 0 0;padding:6px 10px;border-left:3px solid var(--ink);background:var(--panel);border-radius:0 6px 6px 0}
.hlinks{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.hchips{margin:8px 0 0}
.hrate{display:flex;gap:10px;align-items:center;margin-top:6px}
.hfoot{display:flex;flex-wrap:wrap;gap:4px 14px;padding:0 14px 10px}
.hfoot .linkbtn{font-size:13px}
.gtoc{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px 20px}
.gtoc b{grid-column:1/-1}
.gtoc div{display:flex;flex-direction:column;gap:3px}
.gtoc a{font-size:14px}
.gsec ol{margin:8px 0;padding-left:22px;line-height:1.6}
@media (max-width:880px){
  .helpbtn span{display:none}
  .helppanel{inset:calc(56px + env(safe-area-inset-top,0px)) 0 0 0;width:100%;border-radius:0;border-width:1.5px 0 0;box-shadow:none;padding-bottom:env(safe-area-inset-bottom,0px);z-index:60}
}
@media print{ .appbar,.tabbar,.helppanel,#gq,#gprint,.gtoc,#gmiss,.newsbar{display:none !important} .panel{border:0;box-shadow:none;break-inside:avoid} }
.courses{display:flex;flex-wrap:wrap;gap:8px 18px;margin:4px 0}
.vfind li{flex-wrap:wrap;gap:8px}
.vfrow{display:flex;gap:6px;align-items:center;flex-wrap:wrap}
.vfrow .inp{width:min(320px,60vw);padding:6px 10px}

/* ================= learning path ================= */
.mbar{display:inline-block;width:100%;max-width:220px;height:8px;border-radius:99px;background:var(--line);overflow:hidden;vertical-align:middle}
.mbar>span{display:block;height:100%;background:var(--ok,#2f8f5b);border-radius:99px;transition:width .4s}
.tile .mbar{margin-top:8px}
.mcell{display:flex;flex-direction:column;gap:3px;min-width:110px}
.upnext{border-width:2px}
.uhead{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.uhead h2{margin:0}.uhead .mbar{max-width:160px}
.plist{list-style:none;margin:12px 0 0;padding:0;display:flex;flex-direction:column;gap:6px}
.plist a{display:grid;grid-template-columns:32px 1fr 180px auto;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:8px;text-decoration:none;color:inherit}
.plist a:hover{border-color:var(--ink)}
.pnum{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;border:1.5px solid var(--ink);font-weight:700;font-size:13px}
.pname{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.pm{display:flex;align-items:center;gap:8px}
.thead{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-bottom:12px}.thead .pm{margin-left:auto}.thead .mbar{width:140px}
.crumb{margin:0 0 6px;font-size:14px}
.steps{display:flex;gap:6px;margin:6px 0 16px;flex-wrap:wrap}
.steps button{border:1.5px solid var(--ink);background:var(--panel);border-radius:99px;padding:7px 14px;font-weight:600;cursor:pointer}
.steps button[aria-selected="true"]{background:var(--ink);color:var(--panel)}
.steps button:disabled{opacity:.45;cursor:not-allowed}
.idea{font-size:17px;line-height:1.6;margin:0}
.skgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px}.skgrid .lesson{margin:0;max-width:none}
.exq .ch{cursor:default}
.pgo{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.result .big{font-size:48px;font-weight:800;line-height:1}
@media (max-width:640px){ .plist a{grid-template-columns:28px 1fr;} .plist .pm{grid-column:2} .plist .btn{display:none} .thead .pm{margin-left:0} }

/* ================= view as student ================= */
.impbar{position:sticky;top:0;z-index:40;display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap;padding:8px 14px;padding-top:calc(8px + env(safe-area-inset-top,0px));background:#7a2e0e;color:#fff;font-size:14px}
.impbar .btn{background:#fff;color:#7a2e0e;border-color:#fff}
body.imp .appbar{border-top:3px solid #7a2e0e}
.uacts{white-space:nowrap}
.uedit td{background:var(--accent-soft)}
.ueform{padding:6px 0}
.rubric{list-style:none;padding:0;margin:8px 0;display:flex;flex-direction:column;gap:6px}
.authcard .tagline{margin:-6px 0 6px;font-weight:700;color:var(--accent);font-size:18px}
/* keep the top menu on one line on laptops */
.navlinks{flex-wrap:nowrap;min-width:0;overflow-x:auto;scrollbar-width:none}
.navlinks::-webkit-scrollbar{display:none}
.navlinks a{white-space:nowrap}
@media (max-width:1500px){ .navlinks a{padding:7px 10px;font-size:14.5px} .navlinks{gap:2px} }
@media (max-width:1380px){ .who .rp{display:none} }
@media (max-width:1600px){ .who .rp{display:none} }
@media (max-width:1500px){ .helpbtn span{display:none} .helpbtn{padding-left:10px;padding-right:10px} }

.navmore{position:relative;flex:none}
.navmorebtn{padding:7px 12px;border-radius:999px;border:0;background:none;font:inherit;font-weight:600;font-size:14.5px;color:var(--ink);cursor:pointer;white-space:nowrap}
.navmorebtn:hover,.navmorebtn[aria-expanded="true"]{background:var(--accent-soft)}
.navmorebtn.cur{background:var(--ink);color:var(--panel)}
.navmenu{position:absolute;top:calc(100% + 6px);left:0;z-index:30;min-width:180px;background:var(--panel);border:1.5px solid var(--ink);border-radius:10px;box-shadow:4px 4px 0 var(--line);padding:6px;display:flex;flex-direction:column}
.navmenu[hidden]{display:none}
.navmenu a{border-radius:8px;padding:8px 12px !important}
.navlinks{overflow:visible}
.navlinks{margin-right:10px}

/* ================= product tour ================= */
.tourcard{position:relative;display:block;width:100%;margin:14px 0 18px;padding:0;border:1.5px solid var(--ink);border-radius:12px;overflow:hidden;cursor:pointer;background:#0d1b26;box-shadow:4px 4px 0 var(--line)}
.tourcard img{display:block;width:100%;height:auto;transition:transform .3s}
.tourcard:hover img{transform:scale(1.02)}
.tourplay{position:absolute;left:50%;top:50%;width:64px;height:64px;margin:-32px 0 0 -32px;border-radius:50%;background:#FFB23F;box-shadow:0 6px 18px rgba(0,0,0,.35)}
.tourplay::after{content:"";position:absolute;left:25px;top:19px;border-style:solid;border-width:13px 0 13px 22px;border-color:transparent transparent transparent #0d1b26}
.tourlabel{position:absolute;left:0;right:0;bottom:0;padding:8px 12px;background:linear-gradient(transparent,rgba(0,0,0,.75));color:#fff;font-weight:700;font-size:14px;text-align:left}
.tourmodal{position:fixed;inset:0;z-index:80;background:rgba(5,12,18,.82);display:grid;place-items:center;padding:16px}
.tourmodal[hidden]{display:none}
.tourbox{width:min(1100px,100%);background:#0d1b26;border-radius:14px;overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.5)}
.tourbox video{display:block;width:100%;aspect-ratio:16/9;background:#000}
.tourbar{display:flex;align-items:center;gap:18px;flex-wrap:wrap;padding:10px 14px;color:#fff}
.tourbar .check span{color:#fff}.tourbar .help{color:#b8c7d3}
.tourbar .btn{margin-left:auto}
.rvdl{white-space:nowrap}.rvdl .help{font-weight:400}.rvforms>.panel{flex:1;min-width:300px}

.pritem .ihead{display:flex;gap:10px;flex-wrap:wrap;align-items:baseline;margin-bottom:8px}.mono{font-family:ui-monospace,Menlo,monospace}
.pritem.done{opacity:.6}.practs{margin-top:10px;align-items:center}.flagbox{display:flex;gap:6px;flex:1;min-width:260px}.flagbox .inp{flex:1}
.prfilters .field{min-width:200px}

/* ================= free response ================= */
.frqlist a{grid-template-columns:1fr auto auto}
.frqparts{margin:8px 0 0;padding-left:22px;line-height:1.6}.frqparts li{margin:6px 0}
.frqwrap{display:grid;gap:16px}.frqwrap.withdocs{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);align-items:start}
.frqdocs{max-height:78vh;overflow:auto;position:sticky;top:12px}
.frqdoc{border-top:1px solid var(--line);padding:10px 0}.frqdoc p{margin:0;line-height:1.55}
.frqbar{align-items:center;gap:10px;margin-bottom:8px}#frqclock{font-variant-numeric:tabular-nums;font-weight:700}#frqclock.over{color:#B3261E}
.frqta{width:100%;font-family:var(--math);font-size:16px;line-height:1.6}.frqessay{min-height:420px}
.frqrubric{display:flex;flex-direction:column;gap:10px;margin:8px 0 12px}
.frqrow{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:start;border-bottom:1px solid var(--line);padding-bottom:8px}
.frqpts{display:flex;gap:10px}
.frqread{white-space:normal;line-height:1.65;font-family:var(--math);font-size:16px}
.frvi summary{cursor:pointer;display:flex;gap:10px;align-items:center;flex-wrap:wrap}
@media (max-width:880px){ .frqwrap.withdocs{grid-template-columns:1fr} .frqdocs{position:static;max-height:none} }
// teacher link on sign-in
.teacherfoot{margin-top:4px;font-size:14px;color:var(--muted)}.teacherfoot a{font-weight:600}