/* Class Assistant: the Alignment Studio's look (Inter, Didact Gothic titles, cool greys, the EUC red-orange accent),
   light and dark. Shared by the instructor page, the student page and the join page. */
:root{
  --bg:#f6f7f9; --surface:#ffffff; --surface-2:#f2f4f7; --surface-3:#e5e8ed; --border:#e6e8ec; --border-2:#d5d9e0;
  --text:#101828; --text-2:#344054; --muted:#667085;
  --accent:#de3d22; --accent-2:#c4321a; --accent-soft:#fdeee9; --accent-text:#b4301a;
  --good:#12a150; --good-soft:#e3f6ea; --good-text:#0e6b3a;
  --warn:#e08a00; --warn-soft:#fff3d6; --warn-text:#8a4b00;
  --bad:#d92d4b; --bad-soft:#fde7eb; --bad-text:#a3162f;
  --info:#0e8fb3; --info-soft:#e0f4fa; --info-text:#0b5e77;
  --data:#3b4252;
  --shadow:0 1px 2px rgba(16,24,40,.05); --shadow-md:0 4px 14px rgba(16,24,40,.07),0 1px 3px rgba(16,24,40,.05);
  --shadow-lg:0 24px 64px rgba(16,24,40,.18); --radius:14px; --radius-sm:10px;
  --font:"Inter","Open Sans",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif; --font-title:"Didact Gothic","Inter",sans-serif;
  color-scheme:light;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0d0f13; --surface:#15181e; --surface-2:#1c2028; --surface-3:#272c35; --border:#252a33; --border-2:#353b46;
  --text:#f2f4f7; --text-2:#cdd2da; --muted:#949bab;
  --accent:#ff5b3d; --accent-2:#ec4527; --accent-soft:rgba(255,91,61,.14); --accent-text:#ff8a72;
  --good:#2bc46c; --good-soft:rgba(43,196,108,.14); --good-text:#86e3ad; --warn:#f5a524; --warn-soft:rgba(245,165,36,.14); --warn-text:#fcd27a;
  --bad:#fb6b84; --bad-soft:rgba(251,107,132,.14); --bad-text:#fda4b4; --info:#2cc4ea; --info-soft:rgba(44,196,234,.13); --info-text:#a2e6f8;
  --data:#c8cedb; --shadow:0 1px 2px rgba(0,0,0,.3); --shadow-md:0 6px 18px rgba(0,0,0,.35); --shadow-lg:0 24px 64px rgba(0,0,0,.55); color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0d0f13; --surface:#15181e; --surface-2:#1c2028; --surface-3:#272c35; --border:#252a33; --border-2:#353b46;
  --text:#f2f4f7; --text-2:#cdd2da; --muted:#949bab;
  --accent:#ff5b3d; --accent-2:#ec4527; --accent-soft:rgba(255,91,61,.14); --accent-text:#ff8a72;
  --good:#2bc46c; --good-soft:rgba(43,196,108,.14); --good-text:#86e3ad; --warn:#f5a524; --warn-soft:rgba(245,165,36,.14); --warn-text:#fcd27a;
  --bad:#fb6b84; --bad-soft:rgba(251,107,132,.14); --bad-text:#fda4b4; --info:#2cc4ea; --info-soft:rgba(44,196,234,.13); --info-text:#a2e6f8;
  --data:#c8cedb; --shadow:0 1px 2px rgba(0,0,0,.3); --shadow-md:0 6px 18px rgba(0,0,0,.35); --shadow-lg:0 24px 64px rgba(0,0,0,.55); color-scheme:dark}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--text);font:14px/1.5 var(--font);-webkit-font-smoothing:antialiased}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
button,input,select,textarea{font:inherit;color:inherit}
a{color:var(--accent-text);text-decoration:none} a:hover{text-decoration:underline}
h1,h2,h3{font-family:var(--font-title);font-weight:400;letter-spacing:0;margin:0}
h1{font-size:26px} h2{font-size:19px} h3{font-size:15.5px}
.muted{color:var(--muted)} .small{font-size:12.5px} .nowrap{white-space:nowrap}
.app{display:grid;grid-template-columns:260px 1fr;min-height:100vh}

/* sidebar */
.side{position:sticky;top:0;height:100vh;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:22px 12px 16px;gap:2px;overflow-y:auto}
.brand{display:flex;flex-direction:column;gap:8px;padding:2px 8px 18px}
.brand img{height:34px;width:auto;display:block}
.brand .on-dark{display:none}
:root[data-theme="dark"] .brand .on-light{display:none} :root[data-theme="dark"] .brand .on-dark{display:block}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .brand .on-light{display:none} :root:not([data-theme="light"]) .brand .on-dark{display:block}}
.brand b{font-family:var(--font-title);font-weight:400;font-size:17px}
.brand span{font-size:11.5px;color:var(--muted)}
.nav-label{font-size:10.5px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);padding:16px 12px 6px;font-weight:600}
.nav{position:relative;display:flex;align-items:center;gap:10px;padding:7px 12px;border-radius:8px;border:0;background:none;cursor:pointer;color:var(--text-2);font-weight:500;font-size:13.5px;text-align:left;width:100%}
.nav:hover{background:var(--surface-2);color:var(--text)}
.nav.active{background:var(--surface-2);color:var(--text);font-weight:600}
.nav.active::before{content:"";position:absolute;left:-12px;top:7px;bottom:7px;width:3px;border-radius:0 3px 3px 0;background:var(--accent)}
.nav .count{margin-left:auto;font-size:11px;background:var(--surface-2);border:1px solid var(--border);border-radius:999px;padding:0 7px;font-weight:600}
.nav .dot{width:7px;height:7px;border-radius:50%;background:var(--good);flex:none}
.nav .sub{display:block;font-size:11.5px;color:var(--muted);font-weight:400}
.side-foot{margin-top:auto;padding:14px 10px 0;font-size:11.5px;color:var(--muted);border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px}

/* main */
.main{min-width:0;display:flex;flex-direction:column}
.topbar{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--surface) 85%,transparent);backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--border);padding:12px 32px 0}
.topbar .row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.topbar .title{flex:1;min-width:200px}
.tabs{display:flex;gap:2px;margin-top:10px;overflow-x:auto}
.tab{border:0;background:none;padding:9px 14px;cursor:pointer;color:var(--muted);font-weight:500;border-bottom:2px solid transparent;white-space:nowrap}
.tab:hover{color:var(--text)} .tab.on{color:var(--text);border-bottom-color:var(--accent);font-weight:600}
.content{padding:26px 32px 60px;max-width:1240px;width:100%}

/* building blocks */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;box-shadow:var(--shadow)}
.card+.card,.stack>*+*{margin-top:16px}
.grid>.card+.card{margin-top:0}  /* cards side by side start level */
.card-head{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.card-head h2,.card-head h3{flex:1}
.grid{display:grid;gap:16px} .g2{grid-template-columns:repeat(2,minmax(0,1fr))} .g3{grid-template-columns:repeat(3,minmax(0,1fr))} .g4{grid-template-columns:repeat(4,minmax(0,1fr))}
.kpi{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px}
.kpi b{display:block;font-size:26px;font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:-.02em}
.kpi span{font-size:12px;color:var(--muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--border-2);background:var(--surface);border-radius:9px;padding:6px 13px;min-height:34px;cursor:pointer;font-weight:500;box-shadow:var(--shadow);text-decoration:none;color:var(--text)}
.btn:hover{border-color:color-mix(in srgb,var(--text) 25%,var(--border-2));text-decoration:none}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}
.btn.primary:hover{background:var(--accent-2)}
.btn.ghost{background:none;box-shadow:none;border-color:transparent}
.btn.danger{color:var(--bad-text)}
.btn.sm{min-height:28px;padding:3px 10px;font-size:12.5px}
.btn:disabled{opacity:.55;cursor:default}
.input,.select,textarea.input{appearance:none;background:var(--surface);border:1px solid var(--border-2);border-radius:9px;padding:7px 11px;min-height:36px;outline:none;width:100%}
textarea.input{min-height:90px;resize:vertical;line-height:1.45}
.select{padding-right:30px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 10px center;cursor:pointer}
.input:focus,.select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.field{display:flex;flex-direction:column;gap:4px;margin-bottom:12px}
.field>label{font-size:11px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);font-weight:600}
.field .hint{font-size:12px;color:var(--muted)}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.end{justify-content:flex-end}
.spacer{flex:1}
.pill{display:inline-flex;align-items:center;gap:5px;font-size:11.5px;font-weight:600;padding:1px 9px;border-radius:999px;background:var(--surface-2);color:var(--text-2);border:1px solid var(--border);white-space:nowrap}
.pill.good{background:var(--good-soft);color:var(--good-text);border-color:transparent}
.pill.warn{background:var(--warn-soft);color:var(--warn-text);border-color:transparent}
.pill.bad{background:var(--bad-soft);color:var(--bad-text);border-color:transparent}
.pill.info{background:var(--info-soft);color:var(--info-text);border-color:transparent}
.pill.accent{background:var(--accent-soft);color:var(--accent-text);border-color:transparent}
table.t{width:100%;border-collapse:collapse}
.t th{text-align:left;font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:600;padding:8px 10px;border-bottom:1px solid var(--border)}
.t td{padding:9px 10px;border-bottom:1px solid var(--border);vertical-align:top}
.t tr:last-child td{border-bottom:0}
.empty{padding:28px;text-align:center;color:var(--muted);border:1px dashed var(--border-2);border-radius:var(--radius)}
.switch{position:relative;display:inline-flex;align-items:center;gap:10px;cursor:pointer;font-weight:500}
.switch input{position:absolute;opacity:0;pointer-events:none}
.switch i{width:38px;height:22px;border-radius:999px;background:var(--surface-3);position:relative;transition:background .15s;flex:none}
.switch 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:left .15s}
.switch input:checked+i{background:var(--good)} .switch input:checked+i::after{left:19px}
.switch input:focus-visible+i{outline:2px solid var(--accent);outline-offset:2px}
.callout{border-radius:var(--radius-sm);padding:10px 14px;background:var(--info-soft);color:var(--info-text);font-size:13px}
.callout.warn{background:var(--warn-soft);color:var(--warn-text)} .callout.good{background:var(--good-soft);color:var(--good-text)}
.share-switch{display:flex;align-items:center;gap:16px;padding:18px;border-radius:14px;background:var(--surface-2);border:1px solid var(--border)}
.switch.big i{width:52px;height:30px} .switch.big i::after{width:24px;height:24px} .switch.big input:checked+i::after{left:25px}
.addr{display:flex;align-items:center;gap:10px;padding:10px 12px;border:1px solid var(--border);border-radius:10px;margin-top:8px;font:14px ui-monospace,Consolas,monospace;flex-wrap:wrap}
.addr>span:first-child{flex:1;min-width:0;overflow-wrap:anywhere}
.addr .addr-label{flex:none;font-family:var(--font)} .addr .btn{font-family:var(--font)}
.linkbox{display:flex;gap:8px;align-items:center;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:8px 10px;font:600 15px/1.3 ui-monospace,Consolas,monospace;word-break:break-all}
.linkbox span{flex:1}
.code-big{font:700 34px/1 ui-monospace,Consolas,monospace;letter-spacing:.18em;color:var(--accent-text)}
.qr{background:#fff;padding:10px;border-radius:10px;display:inline-block;line-height:0}

/* bars (statistics) */
.bars{display:flex;flex-direction:column;gap:6px}
.bar{display:grid;grid-template-columns:minmax(120px,240px) 1fr 44px;gap:10px;align-items:center;font-size:13px}
.bar .bl{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bar .bt{height:12px;background:var(--surface-2);border-radius:4px;overflow:hidden}
.bar .bt i{display:block;height:100%;background:var(--data);border-radius:4px}
.bar.hot .bt i{background:var(--accent)}
.bar .bv{text-align:right;font-variant-numeric:tabular-nums;color:var(--text-2)}
.cols{display:flex;align-items:flex-end;gap:3px;height:120px;padding-top:6px}
.cols div{flex:1;background:var(--data);border-radius:3px 3px 0 0;min-height:1px;position:relative}
.cols div:hover{background:var(--accent)}
.cols-x{display:flex;gap:3px;font-size:10.5px;color:var(--muted)} .cols-x span{flex:1;text-align:center}
.u{display:inline-flex;gap:2px} .u i{width:8px;height:8px;border-radius:2px;background:var(--surface-3)} .u i.on{background:var(--accent)}

/* weeks */
.week{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);margin-bottom:12px}
.week>header{display:flex;align-items:center;gap:10px;padding:12px 16px;cursor:pointer;flex-wrap:wrap}
.week>header .wk{font-weight:700;color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:.06em;min-width:64px;white-space:nowrap;flex:none}
.week>header .wt .muted{font-weight:400;font-style:italic}
.week>header .wt{flex:1;font-weight:600;min-width:120px}
.week .body{padding:0 16px 14px;border-top:1px solid var(--border)}
.week.now{border-color:color-mix(in srgb,var(--accent) 45%,var(--border))}
.item{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--border);flex-wrap:wrap}
.item:last-child{border-bottom:0}
.item .name{flex:1;min-width:180px}
.item .name b{font-weight:600}
.drop{display:block;border:1.5px dashed var(--border-2);border-radius:var(--radius-sm);padding:14px;text-align:center;color:var(--muted);margin-top:10px;cursor:pointer}
.drop.over{border-color:var(--accent);background:var(--accent-soft);color:var(--accent-text)}

/* question feed */
.q .meta{display:flex;gap:8px;align-items:center;font-size:12px;color:var(--muted);flex-wrap:wrap}
.q .text{margin:4px 0;white-space:pre-wrap}
.q details{font-size:13px;color:var(--text-2)} .q summary{cursor:pointer;color:var(--muted);font-size:12px}
.q .reply{background:var(--surface-2);border-radius:10px;padding:8px 12px;margin-top:6px}

/* collapsible sections: the title and a one-line summary; click to open */
.secs{display:flex;flex-direction:column;gap:10px}
details.sec{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
details.sec>summary{list-style:none;display:flex;align-items:center;gap:12px;padding:14px 18px;cursor:pointer;flex-wrap:wrap}
details.sec>summary::-webkit-details-marker{display:none}
details.sec>summary:hover{background:var(--surface-2);border-radius:var(--radius)}
details.sec[open]>summary{border-bottom:1px solid var(--border);border-radius:var(--radius) var(--radius) 0 0}
.sec-t{font-family:var(--font-title);font-size:16.5px}
.sec-s{flex:1;color:var(--muted);font-size:12.5px;min-width:160px}
.sec-a{display:flex;gap:6px}
.sec-chev{width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(-45deg);transition:transform .15s;flex:none;margin-right:2px}
details[open]>summary>.sec-chev{transform:rotate(45deg)}
.sec-b{padding:14px 18px 18px}
details.sec.sub{box-shadow:none;background:var(--surface-2);margin-top:8px}
details.sec.sub>summary{padding:10px 14px}
details.sec.sub .sec-t{font-size:14.5px}
details.sec.sub .sec-b{padding:6px 14px 12px}
.filters{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-bottom:10px}
.filters-card .filters{margin-bottom:0}
.filters .select{width:auto;max-width:240px}
.filters .select.on{border-color:var(--accent);background-color:var(--accent-soft)}
/* questions: one line each, open for the details */
details.q{border-bottom:1px solid var(--border)}
details.q:last-child{border-bottom:0}
details.q>summary{list-style:none;display:flex;align-items:center;gap:10px;padding:10px 4px;cursor:pointer}
details.q>summary::-webkit-details-marker{display:none}
details.q>summary:hover{background:var(--surface-2)}
.q-line{flex:1;min-width:0;display:flex;gap:10px;align-items:baseline;overflow:hidden}
.q-line b{flex:none}
.q-first{color:var(--text-2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.q-tags{display:flex;gap:6px;align-items:center;flex:none}
.q-body{padding:4px 4px 14px 24px}
@media (max-width:900px){ .q-tags .pill{display:none} }

/* Student questions: a conversation, opened, as a chat with the tutor's note under each answer */
.seg{display:inline-flex;background:var(--surface-2);border:1px solid var(--border);border-radius:10px;padding:3px;gap:2px}
.seg button{border:0;background:none;padding:5px 12px;border-radius:7px;cursor:pointer;font-weight:500;color:var(--muted);font-size:13px}
.seg button.on{background:var(--surface);color:var(--text);box-shadow:var(--shadow);font-weight:600}
.conv .q-line{gap:8px;align-items:center}
.conv-body{display:flex;flex-direction:column;gap:6px;padding:6px 6px 16px 26px}
.c-msg{max-width:760px;padding:8px 12px;border-radius:12px;line-height:1.5}
.c-msg.me{align-self:flex-start;background:var(--accent-soft);white-space:pre-wrap}
.c-msg.bot{background:var(--surface-2);margin-left:28px}
.c-msg.bot p{margin:0 0 6px} .c-msg.bot p:last-child{margin:0} .c-msg.bot ul,.c-msg.bot ol{margin:4px 0;padding-left:20px}
.c-who{font-size:11px;font-weight:700;color:var(--muted);margin-bottom:2px;white-space:normal}
.c-note{font-size:12px;color:var(--muted);margin:0 0 8px 28px}

/* modal + toast */
.overlay{position:fixed;inset:0;background:rgba(16,24,40,.45);display:none;align-items:flex-start;justify-content:center;z-index:50;padding:6vh 16px;overflow-y:auto}
.overlay.on{display:flex}
.modal{background:var(--surface);border-radius:var(--radius);box-shadow:var(--shadow-lg);width:min(720px,100%);padding:22px 24px}
.modal h2{margin-bottom:14px}
.toast{position:fixed;bottom:22px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--text);color:var(--bg);padding:9px 16px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s;z-index:60;max-width:90vw}
.toast.on{opacity:1;transform:translateX(-50%)}
.spin{width:14px;height:14px;border:2px solid currentColor;border-right-color:transparent;border-radius:50%;display:inline-block;animation:spin .8s linear infinite;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}

/* the dark EUC band at the top, as in the Alignment Studio: logo, the app's name, the page-wide buttons, the orange line */
:root{--bb-h:58px;--hero:#101318}
.brandbar{position:sticky;top:0;z-index:30;height:var(--bb-h);background:var(--hero);color:#fff;border-bottom:3px solid var(--accent)}
:root[data-theme="dark"] .brandbar{background:#07080b}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .brandbar{background:#07080b}}
.bb-in{height:100%;display:flex;align-items:center;gap:12px;padding:0 24px}
.bb-logo img{height:32px;width:auto;display:block}
.bb-app{font-family:var(--font-title);font-size:18px;padding-left:16px;border-left:1px solid rgba(255,255,255,.25);white-space:nowrap}
.bb-tag{font-size:12.5px;color:rgba(255,255,255,.6);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;min-width:0}
.bb-btn{display:inline-flex;align-items:center;gap:7px;height:36px;padding:0 12px;background:transparent;color:#fff;border:1px solid rgba(255,255,255,.25);border-radius:9px;cursor:pointer;font-weight:550;font-size:13.5px;white-space:nowrap;text-decoration:none}
.bb-btn:hover{background:rgba(255,255,255,.1);text-decoration:none}
.bb-btn.icon{width:36px;padding:0;justify-content:center}
.bb-btn.on{border-color:transparent;background:color-mix(in srgb,var(--good) 30%,transparent)}
.bb-btn .dot{width:8px;height:8px;border-radius:50%;background:rgba(255,255,255,.45)}
.bb-btn.on .dot{background:#4ade80}
.bb-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.bb-lang{position:relative;display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 28px 0 10px;font-size:13px;font-weight:600;white-space:nowrap;color:#fff;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2.5'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 10px center;border:1px solid rgba(255,255,255,.25);border-radius:9px;cursor:pointer}
.bb-lang:hover{background-color:rgba(255,255,255,.1)}
.bb-lang:focus-within{outline:2px solid var(--accent);outline-offset:2px}
/* the select covers the label, invisible: the label shows the language, the browser's own list opens on click */
.bb-lang select{position:absolute;inset:0;width:100%;height:100%;opacity:0;cursor:pointer;font-size:14px}
.bb-lang option{color:var(--text);background:var(--surface)}
.bb-lang-short{display:none}
.bb-menu{display:none}
.app>.side{top:var(--bb-h);height:calc(100vh - var(--bb-h))}
.main>.topbar{top:var(--bb-h)}
@media (max-width:1000px){ .bb-tag{display:none} }
@media (max-width:900px){
  .bb-in{padding:0 12px;gap:8px}
  .bb-logo img{height:26px}
  .bb-app{font-size:15px;padding-left:10px}
  .bb-btn span.lbl{display:none}
  .bb-btn{padding:0 10px}
  .bb-menu{display:inline-flex}
  .bb-lang-full{display:none} .bb-lang-short{display:inline}
  .s-side{top:var(--bb-h)}
}

/* ---------------- student page ---------------- */
.s-app{display:grid;grid-template-columns:300px 1fr;height:calc(100vh - var(--bb-h));height:calc(100dvh - var(--bb-h))}
.s-side{background:var(--surface);border-right:1px solid var(--border);overflow-y:auto;padding:18px 14px;display:flex;flex-direction:column;gap:14px}
.s-main{display:flex;flex-direction:column;min-width:0;overflow:hidden;height:calc(100vh - var(--bb-h));height:calc(100dvh - var(--bb-h))}
.s-top{padding:12px 20px;border-bottom:1px solid var(--border);background:var(--surface);display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.s-top .ctx{flex:1;min-width:160px}
.chat{flex:1;overflow-y:auto;padding:22px 20px;display:flex;flex-direction:column;gap:14px}
.msg{max-width:min(760px,100%);width:fit-content;padding:10px 14px;border-radius:14px;line-height:1.55;word-wrap:break-word}
.msg.me,.msg.err{white-space:pre-wrap}
.msg.me{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}
.msg.bot{background:var(--surface);border:1px solid var(--border);border-bottom-left-radius:4px}
.msg.bot code,.msg.bot pre{font-family:ui-monospace,Consolas,monospace;font-size:12.5px;background:var(--surface-2);border-radius:5px;padding:1px 4px}
.msg.bot pre{padding:8px 10px;overflow-x:auto;white-space:pre}
/* the tutor's answers: paragraphs, lists, headings, code with a Copy button (also in the instructor's question list) */
.msg.bot p,.reply p{margin:0 0 8px} .msg.bot p:last-child,.reply p:last-child{margin-bottom:0}
.msg.bot ul,.msg.bot ol,.reply ul,.reply ol{margin:4px 0 8px;padding-left:22px} .msg.bot li,.reply li{margin:2px 0}
.msg.bot h4,.reply h4{margin:10px 0 4px;font-size:14px}
.code{position:relative;margin:6px 0 8px} .code pre{margin:0;padding:10px 12px!important;background:var(--surface-2);border-radius:8px;overflow-x:auto;white-space:pre;font:12.5px/1.5 ui-monospace,Consolas,monospace}
.code .copy{position:absolute;top:6px;right:6px;border:1px solid var(--border-2);background:var(--surface);border-radius:6px;font-size:11.5px;padding:2px 8px;cursor:pointer;opacity:.8}
.code .copy:hover{opacity:1;border-color:var(--accent)}
.typing{display:flex;align-items:center;gap:10px;color:var(--muted)}
.dots{display:inline-flex;gap:4px} .dots i{width:7px;height:7px;border-radius:50%;background:var(--muted);animation:blink 1.2s infinite both}
.dots i:nth-child(2){animation-delay:.2s} .dots i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
.quick{display:flex;flex-wrap:wrap;gap:6px;margin:-4px 0 0;max-width:760px}
.quick .chip{font-size:12.5px;padding:5px 11px}
.msg.err{background:var(--bad-soft);color:var(--bad-text)}
.composer{border-top:1px solid var(--border);background:var(--surface);padding:12px 20px 8px}
.composer.hide{display:none}
.composer-in{display:flex;gap:10px;align-items:flex-end}
.composer-hint{font-size:11.5px;color:var(--muted);margin-top:4px;padding-left:2px}
.composer textarea{min-height:44px;max-height:200px;flex:1;width:auto;min-width:0}
.welcome{max-width:620px;margin:auto;text-align:center;color:var(--text-2)}
.welcome .chips{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:14px}
.chip{border:1px solid var(--border-2);background:var(--surface);border-radius:999px;padding:6px 12px;cursor:pointer;font-size:13px}
.chip:hover{border-color:var(--accent);color:var(--accent-text)}
.s-item{display:block;width:100%;text-align:left;border:1px solid var(--border);background:var(--surface-2);border-radius:10px;padding:9px 11px;cursor:pointer;color:var(--text)}
.s-item:hover{background:var(--surface-3);border-color:var(--border-2)} .s-item.on{border-color:var(--accent);background:var(--accent-soft)}
.s-item+.s-item{margin-top:6px}
.s-file{display:flex;gap:10px;align-items:center;color:var(--text)} .s-file svg{flex:none;color:var(--accent)} .s-file:hover{text-decoration:none}
/* the student's menu: the course, then three numbered steps */
.s-course{padding:12px 14px;border-radius:var(--radius-sm);background:var(--surface-2);border:1px solid var(--border)}
.s-course h3{margin:2px 0}
.s-code{font-size:11px;font-weight:700;letter-spacing:.08em;color:var(--accent-text)}
.s-sec{display:flex;flex-direction:column;gap:6px}
.s-h{display:flex;align-items:center;gap:8px;font-size:12px;font-weight:700;color:var(--text-2);text-transform:uppercase;letter-spacing:.05em;margin-bottom:2px}
.s-num{width:20px;height:20px;border-radius:50%;background:var(--accent);color:#fff;display:inline-grid;place-items:center;font-size:11px;flex:none}
.s-row{display:flex;align-items:center;gap:10px}
.s-row+.s-row,.s-sec .s-item+.s-item{margin-top:0}
.s-ic{font-size:18px;line-height:1;flex:none;width:22px;text-align:center}
.s-tx{display:flex;flex-direction:column;min-width:0;flex:1}
.s-tx b{overflow:hidden;text-overflow:ellipsis}
.s-now{font-size:10.5px;font-weight:700;color:#fff;background:var(--accent);border-radius:999px;padding:1px 7px;flex:none}
.s-open{color:var(--muted);flex:none}
.s-empty{font-size:12.5px;color:var(--muted);padding:8px 10px;border:1px dashed var(--border-2);border-radius:10px}
.s-more summary{cursor:pointer;font-size:12.5px;font-weight:600;color:var(--muted);padding:4px 0}
.s-more .s-item{margin-top:6px}
/* the start screen: what do you need help with? */
.start{max-width:760px;margin:auto;width:100%;text-align:center}
.start>p{margin-top:6px}
.pick-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:12px;margin-top:18px;text-align:left}
.pick-card{display:flex;flex-direction:column;gap:4px;align-items:flex-start;text-align:left;padding:16px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);cursor:pointer;box-shadow:var(--shadow);transition:border-color .15s,transform .15s}
.pick-card:hover{border-color:var(--accent);transform:translateY(-1px)}
.pick-ic{font-size:22px;line-height:1} .pick-t{font-weight:600;font-size:15px} .pick-s{font-size:12.5px;color:var(--muted)}
.pick-note{font-size:11.5px;color:var(--warn-text);background:var(--warn-soft);border-radius:999px;padding:1px 8px;margin-top:4px}
.pick-grid.small .pick-card{padding:12px}
.earlier{margin-top:18px;text-align:left} .earlier summary{cursor:pointer;color:var(--muted);font-weight:600}
/* the exercise's questions above the chat */
.act-card{max-width:760px;width:100%;align-self:center;border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:var(--radius-sm);background:var(--surface)}
.act-card summary{padding:10px 14px;cursor:pointer;list-style:none;display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.act-card summary::-webkit-details-marker{display:none}
.act-toggle{margin-left:auto;font-size:12px;color:var(--muted)} .act-card[open] .act-toggle::after{content:' ▴'} .act-card:not([open]) .act-toggle::after{content:' ▾'}
.act-body{padding:0 14px 12px} .act-text{white-space:pre-wrap;line-height:1.55}
.act-files{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px} .act-files .s-item{width:auto;margin:0}
/* the name screen */
.name-card{text-align:center;max-width:420px;margin:0 auto} .name-wave{font-size:34px;margin-bottom:4px}

@media (max-width:900px){
  .app{grid-template-columns:1fr} .side{position:static;height:auto}
  .g2,.g3,.g4{grid-template-columns:1fr 1fr} .content{padding:18px 16px 60px} .topbar{padding:10px 16px 0}
  .s-app{grid-template-columns:1fr} .s-side{display:none;position:fixed;inset:0 20% 0 0;z-index:30;box-shadow:var(--shadow-lg)}
  .s-side.on{display:flex} .chat{padding:16px} .composer{padding:10px 12px}
  .bar{grid-template-columns:110px 1fr 36px}
}
@media (max-width:560px){.g2,.g3,.g4{grid-template-columns:1fr}}

/* ---------------------------------------------------------------- folder upload, files not placed yet */
.folder-card{margin-bottom:14px}
.drop.folder{margin-top:12px;padding:18px}
.unsorted{margin-bottom:14px;border-color:var(--warn-text)}
.pill.auto{background:var(--info-soft);color:var(--info-text);border-color:transparent}
.ow-list{max-height:55vh;overflow:auto;padding-right:4px}
.select.sm-select{width:auto;max-width:210px;padding-top:5px;padding-bottom:5px;font-size:13px}
.span2{grid-column:span 2}
@media (max-width:560px){.span2{grid-column:auto}}

/* ---------------------------------------------------------------- student menu: active tasks, course content */
.s-h svg{color:var(--accent);flex:none}
.s-badge{margin-left:auto;font-size:11px;font-weight:700;color:#fff;background:var(--accent);border-radius:999px;padding:0 7px;letter-spacing:0}
.s-tag{display:inline-block;font-size:10.5px;font-weight:700;color:var(--accent-text);background:var(--accent-soft);border-radius:999px;padding:0 7px}
.s-week{border:1px solid var(--border);border-radius:10px;background:var(--surface-2)}
.s-week[open]{background:var(--surface)}
.s-week.cur{border-color:var(--border-2)}
.s-week>summary{display:flex;align-items:center;gap:8px;padding:9px 11px;cursor:pointer;list-style:none;border-radius:10px}
.s-week>summary::-webkit-details-marker{display:none}
.s-week>summary:hover{background:var(--surface-3)}
.s-week>summary::after{content:"▸";color:var(--muted);font-size:11px;margin-left:4px}
.s-week[open]>summary::after{content:"▾"}
.s-wk{font-weight:700;font-size:13px;white-space:nowrap}
.s-wt{flex:1;min-width:0;font-size:12.5px;color:var(--text-2);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.s-cnt{font-size:11px;color:var(--muted);font-weight:600}
.s-week-body{display:flex;flex-direction:column;gap:6px;padding:2px 8px 10px}
.s-week-body .s-item{margin:0}
/* the join page: a grey prompt, the code itself in capitals once typed */
.join-code{flex:1;font:700 20px ui-monospace,Consolas,monospace;letter-spacing:.15em;text-transform:uppercase}
.join-code::placeholder{font:400 15px var(--font);letter-spacing:0;text-transform:none;color:var(--muted);opacity:.75}

/* ---------------------------------------------------------------- Report: every part as a tile on one screen; click opens it */
.r-kpis{margin-top:14px} .r-kpis .kpi{padding:10px 14px} .r-kpis .kpi b{font-size:22px}
.r-tiles{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:12px}
.r-tile{position:relative;display:flex;flex-direction:column;gap:4px;min-height:168px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);
  box-shadow:var(--shadow);padding:12px 14px 26px;cursor:pointer;text-align:left;overflow:hidden;transition:border-color .12s,box-shadow .12s}
.r-tile:hover,.r-tile:focus-visible{border-color:var(--accent);box-shadow:var(--shadow-lg);outline:none}
.r-tile.wide{grid-column:span 2}
.r-th{display:flex;align-items:flex-start;gap:8px}
.r-tt{flex:1;font-family:var(--font-title);font-size:15px;font-weight:600;line-height:1.25}
.r-ts{font-size:12px;color:var(--muted)}
.r-peek{flex:1;min-height:0;margin-top:6px;overflow:hidden}
.r-peek .bars{gap:4px} .r-peek .bar{grid-template-columns:minmax(60px,45%) 1fr 26px;gap:6px;font-size:12px} .r-peek .bar .bt{height:8px}
.r-peek .cols{height:70px;padding-top:2px}
.cols div.hot{background:var(--accent)}
.r-big .cols{height:220px}
.r-clamp{margin:0;font-size:13px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.r-pills{gap:5px;margin-top:8px}
.r-q{font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:3px 0;border-bottom:1px solid var(--border)} .r-q:last-child{border-bottom:0}
.r-q span{color:var(--text-2)}
.r-open{position:absolute;right:12px;bottom:7px;font-size:11.5px;font-weight:600;color:var(--accent-text);opacity:.8}
.r-tile:hover .r-open{opacity:1}
.modal.wide{width:min(1000px,100%)}
.r-part-head{gap:8px}
.r-checks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 14px}
.r-check{display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--border);border-radius:9px;background:var(--surface-2);cursor:pointer;font-size:13px}
.r-check:hover{border-color:var(--border-2)}
.r-check input{accent-color:var(--accent);width:16px;height:16px;flex:none}
@media (max-width:1100px){ .r-tiles{grid-template-columns:repeat(2,minmax(0,1fr))} }
@media (max-width:620px){ .r-tiles,.r-checks{grid-template-columns:1fr} .r-tile.wide{grid-column:auto} }
@media print{ .r-open{display:none} }

/* the student menu's parts fold: click the heading */
.s-fold>summary{list-style:none;cursor:pointer;border-radius:8px;padding:4px 6px;margin:0 -6px 2px}
.s-fold>summary::-webkit-details-marker{display:none}
.s-fold>summary:hover{background:var(--surface-2)}
.s-fold>summary:focus-visible{outline:2px solid var(--accent);outline-offset:1px}
.s-chev{width:7px;height:7px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:rotate(45deg);transition:transform .15s;flex:none;margin:0 3px 0 6px}
.s-fold:not([open])>summary .s-chev{transform:rotate(-45deg)}
.s-fold .s-badge{margin-left:auto}
.s-cnt-h{margin-left:auto;font-size:11px;font-weight:600;color:var(--muted);text-transform:none;letter-spacing:0}
.s-fold-body{display:flex;flex-direction:column;gap:6px}

.r-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-bottom:12px}
.r-head h2{margin:0}
.r-kpis{gap:12px} .r-kpis .kpi{display:flex;align-items:baseline;gap:10px;padding:9px 14px} .r-kpis .kpi b{display:inline;font-size:21px}
.r-tile{min-height:150px}
.r-tile.strip{grid-column:1/-1;min-height:0;padding-bottom:12px}
.r-tile.strip .r-th{display:inline-flex} .r-tile.strip .r-ts{display:inline;margin-left:10px}
.r-tile.strip{display:block} .r-tile.strip .r-peek{margin-top:8px}  /* the title and its summary on one line */
/* the strips' contents side by side: two columns of questions or bars; the charts a low band */
.r-tile.strip .r-peek-low,.r-tile.strip .r-peek .bars{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 32px}
.r-tile.strip .r-peek .cols{height:46px}
.r-tile.strip .r-q{border-bottom:0}
.r-tile.strip .r-open{bottom:auto;top:13px}
@media (max-width:620px){ .r-tile.strip .r-peek-low,.r-tile.strip .r-peek .bars{grid-template-columns:1fr} }

/* the report's items open their questions; the strips fold */
.bar.click,.cols div.click,tr.click,.r-q.click{cursor:pointer}
.bar.click:hover .bl{color:var(--accent-text);text-decoration:underline}
.bar.click:hover .bt i{background:var(--accent)}
tr.click:hover td{background:var(--surface-2)}
.r-q.click:hover span{color:var(--accent-text);text-decoration:underline}
.r-strips-bar{grid-column:1/-1;display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-top:4px}
.r-strip{grid-column:1/-1;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.r-strip>summary{list-style:none;display:flex;align-items:center;gap:10px;padding:11px 14px;cursor:pointer;border-radius:var(--radius);flex-wrap:wrap}
.r-strip>summary::-webkit-details-marker{display:none}
.r-strip>summary:hover{background:var(--surface-2)}
.r-strip>summary .r-ts{flex:1;min-width:160px}
.r-strip .r-all{color:var(--accent-text);font-weight:600}
.r-strip>.r-peek{padding:2px 14px 14px;margin:0;overflow:visible}
.r-strip .r-peek .bars,.r-strip .r-peek-low{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 32px}
.r-strip .r-peek .bar{grid-template-columns:minmax(60px,45%) 1fr 26px;gap:6px;font-size:12px} .r-strip .r-peek .bar .bt{height:8px}
.r-strip .r-peek .cols{height:56px;padding-top:2px}
.r-strip .r-peek .cols-x{font-size:10px}
.r-strip .r-q{font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;padding:3px 0}
@media (max-width:620px){ .r-strip .r-peek .bars,.r-strip .r-peek-low{grid-template-columns:1fr} }
/* the AI analysis: each item its own small card, its lines close together, the cards apart */
details.sec.sub>.sec-b{display:flex;flex-direction:column;gap:8px;padding-top:10px}
details.sec.sub .item{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:9px 12px;gap:4px 12px;line-height:1.4;align-items:flex-start}
details.sec.sub .item:last-child{border-bottom:1px solid var(--border)}
details.sec.sub .item .name{line-height:1.4}
details.sec.sub .item .name br+*{margin-top:0}

.s-all{display:flex;align-items:center;gap:6px;justify-content:flex-end;font-size:11.5px;color:var(--muted);margin:-2px 2px 0}
.s-link{border:0;background:none;padding:2px 0;color:var(--accent-text);font-weight:600;cursor:pointer;font-size:11.5px}
.s-link:hover{text-decoration:underline}
#a-custom-box textarea{font-size:13px}
#a-custom-box[hidden]{display:none}  /* .field is display:flex, which would override hidden */
.r-strip>summary .r-tt{flex:none}
/* an analysis item: its title, main text and cause, each a little apart */
.item .name>.ln{display:block;margin-top:6px}

/* ---------------------------------------------------------------- answered on the page */
.form-box{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface-2);padding:12px 14px;margin-bottom:14px}
.form-box[hidden]{display:none}
.fq{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:8px 10px;margin-bottom:8px;display:flex;flex-direction:column;gap:6px}
.fq-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap} .fq-n{min-width:22px}
.fq-pts{width:150px;min-height:28px;padding:3px 9px;font-size:12.5px}
.fq textarea{min-height:56px}
.fq-opts[hidden]{display:none}
/* the student page: the menu, the questions in the middle, the tutor on the right */
.s-app.working{grid-template-columns:300px minmax(0,1fr) minmax(340px,430px)}
.s-app.side-closed{grid-template-columns:46px 1fr}
.s-app.side-closed.working{grid-template-columns:46px minmax(0,1fr) minmax(340px,430px)}
.s-app.side-closed .s-side{padding:10px 4px}
.s-hide{align-self:flex-end;border:0;background:none;color:var(--muted);font-size:12px;font-weight:600;cursor:pointer;padding:2px 4px;margin:-6px -2px -6px 0;border-radius:6px}
.s-hide:hover{color:var(--text);background:var(--surface-2)}
.s-rail{border:1px solid var(--border);background:var(--surface-2);border-radius:10px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:10px;padding:10px 0;color:var(--text-2);font-weight:700}
.s-rail:hover{background:var(--surface-3);color:var(--text)}
.s-rail-t{writing-mode:vertical-rl;font-size:12px;letter-spacing:.08em;text-transform:uppercase}
.s-work{display:flex;flex-direction:column;min-width:0;overflow:hidden;border-right:1px solid var(--border);background:var(--bg)}
.s-work[hidden]{display:none}
.w-head{display:flex;align-items:center;gap:8px;flex-wrap:wrap;padding:12px 20px;border-bottom:1px solid var(--border);background:var(--surface)}
.w-body{flex:1;overflow-y:auto;padding:18px 22px 40px;display:flex;flex-direction:column;gap:14px}
.w-intro{white-space:pre-wrap;color:var(--text-2);font-size:13.5px}
.w-q{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow)}
.w-q:focus-within{border-color:var(--accent)}
.w-qh{display:flex;gap:10px;align-items:flex-start}
.w-n{flex:none;width:26px;height:26px;border-radius:50%;background:var(--accent-soft);color:var(--accent-text);font-weight:700;display:grid;place-items:center;font-size:13px}
.w-qt{flex:1;white-space:pre-wrap;line-height:1.5}
.w-code{font-family:ui-monospace,Consolas,monospace;font-size:13px;tab-size:4}
.w-opts{display:flex;flex-direction:column;gap:6px}
.w-opt{display:flex;gap:10px;align-items:flex-start;padding:8px 10px;border:1px solid var(--border);border-radius:9px;cursor:pointer;background:var(--surface-2)}
.w-opt:hover{border-color:var(--border-2)} .w-opt input{accent-color:var(--accent);margin-top:3px}
.w-opt:has(input:checked){border-color:var(--accent);background:var(--accent-soft)}
.w-qa{display:flex;justify-content:flex-end}
.w-foot{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding-top:4px}
.w-foot .muted{flex:1;min-width:200px}
@media (max-width:900px){
  .s-app.working,.s-app.side-closed,.s-app.side-closed.working{grid-template-columns:1fr}
  .s-app.working{grid-template-rows:minmax(0,58fr) minmax(0,42fr)}
  .s-work{border-right:0;border-bottom:1px solid var(--border)}
  .s-hide,.s-rail{display:none}
  .s-app.side-closed .s-side{padding:18px 14px}
}

/* ---------------------------------------------------------------- add an activity: drop the file, check, save */
.drop.big{padding:28px 16px;display:flex;flex-direction:column;align-items:center;gap:6px;font-size:14.5px;color:var(--text-2);background:var(--surface-2)}
.drop-ic{font-size:28px}
.q-file{display:flex;align-items:center;gap:8px;padding:7px 10px;border:1px solid var(--border);border-radius:9px;margin-top:8px;background:var(--surface)}
.callout.good{background:var(--good-soft);color:var(--good-text);border-color:transparent;margin-bottom:14px}
.a-more{border:1px solid var(--border);border-radius:var(--radius-sm);padding:0 12px;margin-bottom:10px;background:var(--surface)}
.a-more>summary{cursor:pointer;padding:10px 0;font-weight:600;font-size:13px}
.a-more[open]>summary{margin-bottom:4px}
.a-foot{margin-top:14px}
#modal .callout{margin-bottom:14px}
.field>label.switch,.field>label.row{text-transform:none;letter-spacing:0;font-weight:500;color:var(--text);font-size:13.5px}
.field>label.row{font-size:12.5px;font-weight:400;color:var(--text-2)}

/* handed in: the activity is closed for the student */
.s-app.working.handed{grid-template-columns:300px minmax(0,1fr)}
.s-app.side-closed.working.handed{grid-template-columns:46px minmax(0,1fr)}
.s-app.handed .s-main{display:none}
.w-done{margin:auto;max-width:520px;text-align:center;padding:40px 24px;display:flex;flex-direction:column;align-items:center;gap:6px}
.w-done-ic{font-size:44px}
.w-done h2{margin:0}
.s-tag.done,.pick-note.done{background:var(--good-soft);color:var(--good-text)}
@media (max-width:900px){ .s-app.working.handed{grid-template-columns:1fr;grid-template-rows:1fr} }

/* timed activities: the countdown */
.w-timer{font-weight:700;font-variant-numeric:tabular-nums;padding:2px 10px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border)}
.w-timer.low{background:var(--bad-soft);color:var(--bad-text);border-color:transparent}
.form-rules{margin-bottom:4px}

/* every submission of a student */
.att-btn{font-variant-numeric:tabular-nums}
.att-btn.on{background:var(--accent-soft);color:var(--accent-text)}
.att-row td{background:var(--surface-2);padding-top:6px;padding-bottom:10px}
.att-list{display:flex;flex-direction:column;gap:6px}
.att{display:flex;align-items:center;gap:8px;flex-wrap:wrap;background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:6px 10px}

/* Add an activity: from a file, or generated from the weeks' material */
.add-seg{margin:-4px 0 14px}
.gen-weeks{display:flex;flex-direction:column;gap:6px;max-height:280px;overflow-y:auto;border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px;background:var(--surface-2)}
.gen-week{background:var(--surface);border:1px solid var(--border);border-radius:9px;padding:6px 10px}
.gen-wk{display:flex;align-items:center;gap:8px;cursor:pointer;text-transform:none;letter-spacing:0;font-size:13px;color:var(--text)}
.gen-files{display:flex;flex-direction:column;gap:2px;padding:4px 0 2px 24px}
.gen-file{display:flex;align-items:center;gap:8px;cursor:pointer;font-size:13px;color:var(--text-2);text-transform:none;letter-spacing:0;font-weight:400}
.gen-file .muted{margin-left:auto}
.gen-wk input,.gen-file input{accent-color:var(--accent);width:15px;height:15px;flex:none}

/* the activity window: its buttons stay at the bottom of the screen while the window scrolls */
.a-foot{position:sticky;bottom:0;z-index:3;background:var(--surface);margin:14px -24px -22px;padding:12px 24px 14px;
  border-top:1px solid var(--border);border-radius:0 0 var(--radius) var(--radius);box-shadow:0 -6px 14px -10px rgba(16,24,40,.25)}
.overlay{padding-bottom:0}
.modal{margin-bottom:6vh}
/* the student menu: Submitted */
.s-badge.done{background:var(--good-text)}

/* the student's question box: bigger; the menu's hide / show buttons with an icon */
.composer textarea{min-height:78px;font-size:14.5px;line-height:1.45;padding:10px 13px}
.composer-in{align-items:stretch} .composer-in .btn{align-self:flex-end;min-height:42px}
.s-hide{display:inline-flex;align-items:center;gap:6px;padding:4px 8px}
.s-hide svg,.s-rail svg{flex:none}

/* the gear button (course settings) and its window */
.gear-btn{align-self:flex-end;padding:8px 10px;display:inline-flex;align-items:center}
.gear-btn svg{display:block}
.set-sec{padding:14px 0;border-top:1px solid var(--border)}
.set-sec:first-of-type{border-top:0;padding-top:4px}
.set-sec h3{margin:0 0 10px;font-size:15px}
.set-sec.danger h3{color:var(--bad-text)}
.set-title{display:flex;align-items:center;gap:8px}

/* ---------------------------------------------------------------- the Overview */
.ov-banner{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:12px 16px;border-radius:var(--radius);margin-bottom:14px;border:1px solid transparent;font-size:14px}
.ov-banner>span{flex:1;min-width:220px}
.ov-banner.warn{background:var(--warn-soft);border-color:color-mix(in srgb,var(--warn) 35%,transparent);color:var(--text)}
.ov-banner.info{background:var(--info-soft);border-color:color-mix(in srgb,var(--info) 35%,transparent);color:var(--text)}
.ov-kpis{display:grid;grid-template-columns:repeat(4,1fr);padding:6px 4px;gap:0}
.ov-kpis .kpi{background:none;border:0;border-radius:0;display:flex;align-items:center;gap:12px;padding:12px 16px}
.ov-kpis .kpi+.kpi{border-left:1px solid var(--border)}
.ov-kpis .kpi b small{font-size:14px;font-weight:500;color:var(--muted)}
.kpi-ic{flex:none;width:38px;height:38px;border-radius:10px;display:grid;place-items:center}
.kpi-ic.info{background:var(--info-soft);color:var(--info-text)} .kpi-ic.good{background:var(--good-soft);color:var(--good-text)}
.kpi-ic.warn{background:var(--warn-soft);color:var(--warn-text)} .kpi-ic.bad{background:var(--bad-soft);color:var(--bad-text)}
.kpi-ic.accent{background:var(--accent-soft);color:var(--accent-text)}
.ov-look{margin-top:14px}
.ov-pair{margin-top:14px;align-items:stretch}
.ov-wk{font-weight:400;font-size:14px}
.ov-list{display:flex;flex-direction:column}
.ov-row,.ov-look-row,.ov-qrow{display:flex;align-items:center;gap:10px;padding:10px 2px;border-top:1px solid var(--border);font-size:14px}
.ov-list>:first-child{border-top:0}
.ov-row .name,.ov-look-row .name{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ov-look-row,.ov-qrow{background:none;border-left:0;border-right:0;border-bottom:0;width:100%;text-align:left;color:var(--text);cursor:pointer;font:inherit;font-size:14px;border-radius:6px}
.ov-look-row:hover,.ov-qrow:hover{background:var(--surface-2, rgba(127,127,127,.07))}
.ov-view{color:var(--muted);font-size:13px} .ov-look-row:hover .ov-view{color:var(--accent-text)}
.ov-dot{flex:none;width:9px;height:9px;border-radius:50%}
.ov-dot.warn{background:var(--warn)} .ov-dot.bad{background:var(--bad)} .ov-dot.info{background:var(--info)}
.ov-ok{color:var(--good-text);font-size:14px;padding:4px 2px}
.ov-kind{font-size:12.5px;color:var(--muted)}
.ov-kind.k-slides{color:var(--info-text)} .ov-kind.k-reading{color:var(--good-text)} .ov-kind.k-notes{color:var(--warn-text)}
.ov-type{display:inline-block;font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.04em;color:var(--accent-text);background:var(--accent-soft);border-radius:5px;padding:1px 6px;margin-right:8px;vertical-align:1px}
.ov-state{font-size:12.5px;color:var(--muted)} .ov-state.on{color:var(--good-text)}
.ov-qrow{flex-direction:column;align-items:flex-start;gap:2px}
.ov-qtext{font-weight:500;max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ov-meta{font-size:12.5px;color:var(--muted)} .ov-topic{color:var(--accent-text)}
@media (max-width:900px){.ov-kpis{grid-template-columns:repeat(2,1fr)} .ov-kpis .kpi:nth-child(3){border-left:0}}

/* the course outline, above Week 1 */
.week.outline-wk{border-color:color-mix(in srgb,var(--info) 40%,var(--border))}
.week.outline-wk>header{background:var(--info-soft)}
.week.outline-wk .wk{display:inline-flex;align-items:center;gap:6px;color:var(--info-text);white-space:nowrap}

/* ---------------------------------------------------------------- Weeks & slides, clean */
.wk-top{display:flex;align-items:center;gap:6px;flex-wrap:wrap;margin-bottom:14px}
.wk-top p{margin:0;flex:1;min-width:220px}
.week.wk2>header .wk{color:var(--text);text-transform:none;letter-spacing:0;font-size:14px;min-width:70px}
.week.wk2>header .wt{font-weight:500;color:var(--text-2)}
.week.wk2 .body{border-top:0;padding-top:0}
.week .chev{font-size:12px}
.wk-now{color:var(--accent-text);font-size:13px;font-weight:600;padding:2px 0 8px;border-bottom:1px solid var(--border)}
.wk-row{display:flex;align-items:center;gap:12px;padding:10px 0;border-bottom:1px solid var(--border)}
.wk-row .name{flex:1;min-width:0;display:flex;flex-direction:column;gap:2px}
.wk-row .name b{font-weight:500;font-size:14px}
.wk-row .meta{font-size:12.5px;color:var(--muted)}
.wk-row .switch{gap:8px}
.warn-text{color:var(--warn-text)}
.btn.dots{font-size:18px;line-height:1;padding:4px 9px;letter-spacing:1px}
.wk-foot{display:flex;align-items:center;gap:8px;margin-top:10px;flex-wrap:wrap}
.wk-foot .drop{flex:1;min-width:220px;margin:0;padding:9px 14px;text-align:left}
.drop.folder.big{margin-top:8px}
.pop-menu{position:fixed;z-index:60;min-width:190px;background:var(--surface);border:1px solid var(--border-2);border-radius:10px;
  box-shadow:0 12px 32px -8px rgba(16,24,40,.28);padding:6px;display:flex;flex-direction:column}
.pop-menu a,.pop-menu button{all:unset;cursor:pointer;padding:7px 10px;border-radius:6px;font-size:13.5px;color:var(--text)}
.pop-menu a:hover,.pop-menu button:hover{background:var(--surface-2);text-decoration:none}
.pop-menu button.on{font-weight:600}
.pop-menu button.danger{color:var(--bad-text)}
.pop-menu .pm-label{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);padding:8px 10px 2px}
.pop-menu .select{margin:2px 6px 4px;width:auto;font-size:13px;padding:5px 8px}
.pop-menu hr{border:0;border-top:1px solid var(--border);margin:6px 0}

/* ---------------------------------------------------------------- Quizzes & exercises, clean */
.act-week{margin-bottom:14px;padding-top:14px;padding-bottom:6px}
.act-week h3{margin:0 0 4px;font-size:15px;font-weight:600;padding-bottom:8px;border-bottom:1px solid var(--border)}
.act-week .wk-row:last-child{border-bottom:0}
.act-title{cursor:pointer} .act-title:hover{color:var(--accent-text)}
.good-text{color:var(--good-text)}
.m-top{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.m-top h2{margin:0;flex:1}
.m-x{font-size:16px;padding:4px 10px}
.modal.narrow{max-width:460px}
.add-choices{display:flex;flex-direction:column;gap:10px}
.add-choice{all:unset;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;gap:3px;padding:13px 16px;border:1px solid var(--border);border-radius:10px;background:var(--surface)}
.add-choice:hover,.add-choice:focus-visible{border-color:var(--accent);background:var(--accent-soft)}
.add-choice b{font-size:14.5px;font-weight:600;color:var(--text)}
.add-choice span{font-size:13px;color:var(--muted)}

/* ---------------------------------------------------------------- Students' answers window */
.ans-bar{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.ans-bar>span{flex:1}
.ans-t td{vertical-align:middle;padding:12px 10px}
.ans-r td:first-child b{color:var(--accent-text);font-weight:600}
.ans-note{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.ans-note.warn{color:var(--warn-text)} .ans-note.info{color:var(--info-text)}
.ans-act{text-align:right}
.att-tog{all:unset;cursor:pointer;padding:3px 6px;border-radius:6px;white-space:nowrap}
.att-tog:hover{background:var(--surface-2)}
.att-tog .chev{display:inline-block;font-size:10px;color:var(--muted);transition:transform .15s}
.att-tog.on .chev{transform:rotate(180deg)}
.att-row>td{padding:0 0 12px;border-bottom:1px solid var(--border)}
.att-panel{background:var(--surface-2);border-radius:10px;padding:4px 12px 10px}
.att2{display:flex;align-items:center;gap:10px;padding:9px 0;border-bottom:1px solid var(--border)}
.att2 .att-t{flex:1;font-size:13px;color:var(--muted)} .att2 .att-t b{color:var(--text);font-weight:600}
.att-foot{display:flex;gap:8px;align-items:center;padding-top:10px}
.pop-menu a small{display:block;font-size:11.5px;color:var(--muted);margin-top:1px}

/* ---------------------------------------------------------------- Add an activity: the two steps */
.modal.mid{max-width:560px}
.gen2{display:flex;flex-direction:column;border-top:1px solid var(--border)}
.gen2 .gen-week{border-bottom:1px solid var(--border);padding:0;margin:0;background:none;border-radius:0}
.gen2 .gen-head{display:flex;align-items:center;gap:10px;padding:9px 2px}
.gen2 .gen-wk{flex:1;display:flex;align-items:center;gap:10px;cursor:pointer;font-size:14px;margin:0}
.gen2 .gen-wk input,.gen2 .gen-file input{width:17px;height:17px;accent-color:var(--accent);flex:none}
.gen-n{all:unset;cursor:pointer;font-size:12.5px;color:var(--muted);white-space:nowrap;padding:2px 4px;border-radius:5px}
.gen-n:hover{background:var(--surface-2)}
.gen-n .chev{display:inline-block;font-size:10px;transition:transform .15s}
.gen2 .gen-week.open .gen-n .chev{transform:rotate(90deg)}
.gen2 .gen-files{display:none;padding:0 0 10px 27px;flex-direction:column;gap:6px}
.gen2 .gen-week.open .gen-files{display:flex}
.gen2 .gen-file{display:flex;align-items:center;gap:8px;font-size:13.5px;cursor:pointer}
.gen2 .gen-file span:nth-child(2){flex:1}
.gen-more{margin:2px 0 6px}
.gen-more>summary{cursor:pointer;font-size:13.5px;font-weight:500;text-decoration:underline;text-underline-offset:3px;color:var(--text-2);list-style:none;padding:4px 0}
.gen-more>summary::-webkit-details-marker{display:none}
.gen-more[open]>summary{margin-bottom:10px}
.here-row{display:flex;align-items:center;gap:12px;padding:12px 0 4px;font-size:14px;cursor:pointer}
.here-row>span:first-child{flex:1}
.here-row .switch{margin:0}
.btn.primary.off{opacity:.55}

/* Add an activity (both steps): the window stays still; only its middle scrolls, the title and the buttons stay */
.modal.mid{max-height:86vh;overflow-y:auto;overscroll-behavior:contain;margin-bottom:0;padding-top:0;padding-bottom:0}
.modal.mid .m-top{position:sticky;top:0;z-index:3;background:var(--surface);margin:0 -24px 12px;padding:18px 24px 12px;border-bottom:1px solid var(--border)}
.modal.mid .a-foot{margin-bottom:0}
.gen2 .gen-wk{cursor:default}
.gen2 .gen-wk input{cursor:pointer}
.gen-title{all:unset;cursor:pointer;flex:1;font-size:14px;padding:2px 0}
.gen-title:hover{color:var(--accent-text)}
.gen2 .gen-week.open .gen-title{font-weight:600}

/* ---------------------------------------------------------------- the activity page (check / edit) */
body.apage-on{overflow:hidden}
.apage{position:fixed;inset:0;z-index:45;background:var(--bg);overflow-y:auto}
.ap-bar{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:10px;padding:12px 24px;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:0 2px 10px -6px rgba(16,24,40,.2)}
.ap-bar h1{flex:1;margin:0;font-size:18px;font-weight:600}
.ap-wrap{max-width:1120px;margin:0 auto;padding:22px 24px 60px}
.ap-note{padding:11px 16px;border-radius:10px;font-size:13.5px;margin-bottom:16px;border:1px solid transparent}
.ap-note.good{background:var(--good-soft);color:var(--good-text);border-color:color-mix(in srgb,var(--good) 30%,transparent)}
.ap-note.warn{background:var(--warn-soft);color:var(--warn-text);border-color:color-mix(in srgb,var(--warn) 30%,transparent)}
.ap-grid{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:18px;align-items:start}
.ap-main{display:flex;flex-direction:column;gap:16px;min-width:0}
.ap-main>.card .field:last-child{margin-bottom:0}
.ap-title{font-size:16px;font-weight:600}
.ap-side{display:flex;flex-direction:column;gap:14px;position:sticky;top:76px}
.ap-side .card{padding:16px 18px}
.ap-side h3{margin:0 0 12px;font-size:15px}
.ap-side .field{margin-bottom:12px}
.ap-shead{display:flex;align-items:center;gap:10px} .ap-shead h3{flex:1;margin:0} .ap-shead>span{flex:1}
.ap-file{display:flex;align-items:center;gap:8px;font-size:13.5px;padding:6px 0;border-bottom:1px solid var(--border)}
.ap-file a{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.ap-file.new{color:var(--text-2)}
.ap-rm{font-size:12px;color:var(--muted);display:inline-flex;gap:4px;align-items:center;cursor:pointer}
.ap-none{margin:10px 0 0}
.ap-key>summary{list-style:none;cursor:pointer;display:flex;align-items:center;gap:8px}
.ap-key>summary::-webkit-details-marker{display:none}
.ap-key>summary h3{flex:1;margin:0}
.ap-key>summary::after{content:"▸";font-size:11px;color:var(--muted);transition:transform .15s}
.ap-key[open]>summary::after{transform:rotate(90deg)}
.ap-key[open]>summary{margin-bottom:10px}
.ap-qhead{display:flex;align-items:center;gap:8px;margin:4px 0 10px}
.ap-qhead h2{flex:1;margin:0;font-size:16px}
.ap-q{padding:14px 16px;gap:10px;border-radius:var(--radius)}
.ap-q .fq-head{align-items:flex-end;gap:12px}
.ap-q .fq-head .field{margin:0}
.ap-q .fq-head .field label{font-size:11px}
.ap-q .fq-n{font-size:15px;padding-bottom:8px}
.ap-q .fq-kind{min-width:150px}
.ap-q .fq-pts{width:80px;min-height:36px;font-size:14px}
.ap-q .fq-text{min-height:60px}
.fq-opts{display:flex;flex-direction:column;gap:6px}
.fq-opts>.btn{align-self:flex-start}
.fq-opt{display:flex;align-items:center;gap:10px}
.fq-opt .input{flex:1}
.fq-l{width:16px;font-size:12.5px;color:var(--muted);font-weight:600}
#apage [hidden]{display:none!important}
.pv-q{padding:12px 0;border-bottom:1px solid var(--border);display:flex;flex-direction:column;gap:8px}
.pv-opt{display:flex;gap:8px;align-items:center;font-size:14px}
@media (max-width:900px){.ap-grid{grid-template-columns:1fr}.ap-side{position:static}.ap-bar{flex-wrap:wrap}}

/* + Add a question: a wide card under the questions */
.ap-addq{all:unset;box-sizing:border-box;cursor:pointer;width:100%;text-align:center;padding:12px;margin-top:2px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);font-size:14px;font-weight:500;color:var(--text-2)}
.ap-addq:hover,.ap-addq:focus-visible{border-color:var(--accent);color:var(--accent-text);background:var(--accent-soft)}
#a-form-qs .ap-q{margin-bottom:12px}

/* ---------------------------------------------------------------- Student questions: a table */
.sq .card-head{flex-wrap:wrap}
.sq .filters{margin-bottom:10px}
.sq-search{width:100%;margin-bottom:6px}
.sq-tools{display:flex;justify-content:flex-end;gap:4px;margin-bottom:4px}
.sq-row{display:grid;grid-template-columns:18px minmax(110px,1.1fr) minmax(90px,.9fr) minmax(160px,2.2fr) 80px 120px 110px;gap:12px;align-items:center;padding:10px 6px}
.sq-row.one{grid-template-columns:18px minmax(110px,1.1fr) minmax(90px,.9fr) minmax(200px,3fr) 120px 80px}
.sq-th{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted);font-weight:600;border-bottom:1px solid var(--border);padding-top:6px}
.sq-day{font-weight:600;font-size:13px;padding:14px 6px 6px;border-bottom:1px solid var(--border)}
details.sq-q>summary.sq-row{display:grid;list-style:none;cursor:pointer;font-size:13.5px}
details.sq-q>summary.sq-row::-webkit-details-marker{display:none}
details.sq-q>summary.sq-row:hover{background:var(--surface-2)}
.sq-row b{font-weight:600}
.sq-row>span,.sq-row>b{min-width:0;overflow-wrap:anywhere}
.sq-row>b.sq-who{overflow-wrap:break-word;word-break:normal;line-height:1.35}
.sq-chev{color:var(--accent-text);font-size:11px;transition:transform .15s;display:inline-block}
details.sq-q[open] .sq-chev{transform:rotate(90deg)}
.sq-flag{display:block;font-size:12px;color:var(--warn-text);margin-top:2px}
.sq-sub{display:block;font-size:12px;color:var(--muted);margin-top:2px}
.sq-text{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.sq-t{font-size:13px;color:var(--text-2)}
.sq-u{display:flex;align-items:center;gap:8px;white-space:nowrap}
.um{display:inline-flex;gap:2px} .um i{width:8px;height:8px;border-radius:2px;background:var(--surface-3)}
.um.bad i.on{background:var(--bad)} .um.warn i.on{background:var(--warn)} .um.good i.on{background:var(--good)}
.um-n{font-size:12.5px;color:var(--text-2)}
details.sq-q .conv-body,details.sq-q .q-body{padding-left:36px}
@media (max-width:900px){.sq-row{grid-template-columns:18px 1fr 1fr 60px}.sq-row>:nth-child(3),.sq-row>:nth-child(4),.sq-th>:nth-child(3),.sq-th>:nth-child(4){display:none}
  .sq-row.one{grid-template-columns:18px 1fr 1fr 60px}}
details.sq-q>summary.sq-row{color:var(--text)}
details.sq-q>summary.sq-row b{color:var(--text)}

/* ---------------------------------------------------------------- Report, clean */
.rp-top{display:flex;align-items:center;gap:8px;margin-bottom:12px;flex-wrap:wrap}
.rp-scope{flex:1;min-width:200px;color:var(--muted);font-size:13.5px}
.rp-scope.on{color:var(--accent-text);font-weight:600}
.btn.on{border-color:var(--accent);color:var(--accent-text)}
.filters-card[hidden]{display:none}
.filters-card{margin-bottom:12px}
.rp-kpis{margin-bottom:14px}
.rp-ai{margin-bottom:14px}
.rp-ai-h{display:flex;align-items:center;gap:10px;margin-bottom:6px} .rp-ai-h h3{flex:1;margin:0;font-size:16px}
.rp-sum{margin:0 0 10px;font-size:14px;line-height:1.55;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.rp-list{margin:0 0 12px;padding:0;list-style:none;display:flex;flex-direction:column;gap:4px;font-size:13.5px}
.rp-list li{display:flex;align-items:center;gap:8px}
.rp-dot{width:7px;height:7px;border-radius:50%;background:var(--muted);flex:none}
.rp-dot.bad{background:var(--bad)} .rp-dot.warn{background:var(--warn)} .rp-dot.good{background:var(--good)}
.rp-pair{margin-bottom:6px;align-items:stretch}
.rp-card h3{margin:0 0 12px;font-size:15px}
.rp-card .bars{gap:9px} .rp-card .bar{grid-template-columns:minmax(80px,38%) 1fr 30px;font-size:13px} .rp-card .bar .bt{height:7px;border-radius:99px} .rp-card .bar .bt i{border-radius:99px}
.rp-link{all:unset;cursor:pointer;font-size:13px;font-weight:500;text-decoration:underline;text-underline-offset:3px;color:var(--text-2);margin-top:12px;display:inline-block}
.rp-link:hover{color:var(--accent-text)}
.rp-folds{padding:4px 18px}
.rp-fold{border-bottom:1px solid var(--border)} .rp-fold:last-child{border-bottom:0}
.rp-fold>summary{list-style:none;display:flex;align-items:center;gap:12px;padding:13px 2px;cursor:pointer;font-size:14px}
.rp-fold>summary::-webkit-details-marker{display:none}
.rp-fold>summary:hover .rp-ft{color:var(--accent-text)}
.rp-chev{font-size:10px;color:var(--muted);transition:transform .15s;display:inline-block}
.rp-fold[open] .rp-chev{transform:rotate(90deg)}
.rp-ft{flex:1;font-weight:500}
.rp-fs{font-size:13px;color:var(--muted);text-align:right}
.rp-fb{padding:0 2px 14px 24px}
.rp-fb .bars{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 32px}
.pop-menu button small{display:block;font-size:11.5px;color:var(--muted);margin-top:1px}
@media (max-width:760px){.rp-fb .bars{grid-template-columns:1fr}.rp-fs{display:none}}
.rp-scope::first-letter{text-transform:uppercase}

/* Quizzes & exercises: each week folds */
details.act-week{padding-top:0;padding-bottom:0}
details.act-week>summary{list-style:none;display:flex;align-items:center;gap:10px;padding:14px 0;cursor:pointer}
details.act-week>summary::-webkit-details-marker{display:none}
details.act-week>summary h3{flex:1;margin:0;padding:0;border:0}
details.act-week>summary:hover h3{color:var(--accent-text)}
details.act-week[open] .rp-chev{transform:rotate(90deg)}
details.act-week .act-body{border-top:1px solid var(--border);padding-bottom:6px}
.accent-text{color:var(--accent-text)}

/* ---------------------------------------------------------------- deleted courses */
.side-link{all:unset;box-sizing:border-box;cursor:pointer;display:flex;align-items:center;gap:8px;width:100%;padding:7px 12px;margin-top:6px;font-size:13px;color:var(--muted);border-radius:8px}
.side-link:hover{background:var(--hover, rgba(0,0,0,.04));color:var(--text)}
.side-link svg{width:15px;height:15px}
.side-link .count{margin-left:auto}
.del-list{display:flex;flex-direction:column;border:1px solid var(--border);border-radius:10px;margin-bottom:12px}
.del-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-bottom:1px solid var(--border)}
.del-row:last-child{border-bottom:0}

/* ---------------------------------------------------------------- study: notes and flashcards (student) */
.st-tabs{display:inline-flex;gap:2px;padding:3px;border:1px solid var(--border);border-radius:10px;background:var(--surface-2)}
.st-tab{all:unset;cursor:pointer;padding:6px 12px;border-radius:7px;font-size:13.5px;font-weight:500;color:var(--text-2)}
.st-tab:hover{color:var(--text)} .st-tab.on{background:var(--surface);color:var(--text);box-shadow:var(--shadow)}
.st-wait{margin:auto;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;max-width:420px}
.st-notes{max-width:760px;width:100%;margin:0 auto}
.st-actions{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:14px}
.st-doc{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px 26px;line-height:1.65;font-size:15px}
.st-doc h4{font-size:17px;margin:20px 0 6px;color:var(--accent-text)} .st-doc h4:first-child{margin-top:0}
.st-doc ul,.st-doc ol{padding-left:22px;margin:6px 0} .st-doc li{margin:3px 0} .st-doc p{margin:0 0 10px}
.st-next{all:unset;cursor:pointer;display:block;margin:14px 0 4px;padding:14px 18px;border:1px dashed var(--border-2);border-radius:var(--radius);font-weight:500;text-align:center}
.st-next:hover{border-color:var(--accent);color:var(--accent-text)}
.fc-wrap{max-width:620px;width:100%;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.fc-bar{display:flex;align-items:center;gap:12px}
.fc-prog{flex:1;height:7px;border-radius:99px;background:var(--surface-3);overflow:hidden} .fc-prog i{display:block;height:100%;background:var(--good);border-radius:99px;transition:width .25s}
.fc{all:unset;cursor:pointer;display:block;perspective:1200px;min-height:260px}
.fc-in{position:relative;display:block;width:100%;min-height:260px;transition:transform .45s;transform-style:preserve-3d}
.fc.flip .fc-in{transform:rotateY(180deg)}
.fc-face{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;padding:28px;text-align:center;
  border:1px solid var(--border);border-radius:16px;background:var(--surface);box-shadow:var(--shadow);backface-visibility:hidden;-webkit-backface-visibility:hidden;overflow:auto}
.fc-back{transform:rotateY(180deg);background:var(--accent-soft);border-color:var(--accent)}
.fc-lbl{font-size:11.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--muted)}
.fc-t{font-size:19px;font-weight:600;line-height:1.45} .fc-back .fc-t{font-size:16px;font-weight:400} .fc-back .fc-t p{margin:0}
.fc-tip{font-size:12.5px;color:var(--muted)}
.fc:focus-visible .fc-face{outline:2px solid var(--accent);outline-offset:2px}
.fc-btns{display:flex;gap:10px;justify-content:center} .fc-btns .btn{min-width:140px;min-height:40px}
.fc-foot{text-align:center}
.fc-done{text-align:center;padding:30px 10px}
/* ---------------------------------------------------------------- study: the instructor's preview and edit */
.set-switch{align-items:flex-start;font-weight:400} .set-switch>span{display:flex;flex-direction:column;gap:2px}
.study-pv{border:1px solid var(--border);border-radius:10px;padding:16px 18px;background:var(--surface-2);margin-bottom:12px}
.study-doc{line-height:1.6;font-size:14px} .study-doc h4{margin:14px 0 4px;font-size:15px} .study-doc h4:first-child{margin-top:0}
.study-doc ul{padding-left:20px;margin:4px 0}
.study-cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.study-card{border:1px solid var(--border);border-radius:8px;padding:8px 10px;background:var(--surface);font-size:13px}
.study-card b{display:block;margin-bottom:3px} .study-card p{margin:0}
.study-edit-card{display:grid;grid-template-columns:1fr 1.4fr auto;gap:8px;align-items:start;margin-bottom:8px}
.input.mono{font-family:ui-monospace,Consolas,monospace;font-size:13px}
@media (max-width:640px){.study-cards{grid-template-columns:1fr}.study-edit-card{grid-template-columns:1fr auto}.study-edit-card textarea{grid-column:1}.fc-btns .btn{min-width:0;flex:1}.st-doc{padding:16px}}

/* ---------------------------------------------------------------- study: choosing the weeks */
.st-pick{display:flex;flex-wrap:wrap;align-items:center;gap:6px;max-width:760px;width:100%;margin:0 auto 16px}
.st-pick-l{font-size:12px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--muted);margin-right:4px}
.st-chip{all:unset;cursor:pointer;padding:5px 11px;border:1px solid var(--border-2);border-radius:99px;font-size:13px;color:var(--text-2);background:var(--surface)}
.st-chip:hover{border-color:var(--accent);color:var(--text)}
.st-chip.on{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:500}
.st-chip:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.st-pick-a{display:inline-flex;gap:10px;margin-left:6px}
.st-doc+.st-doc{margin-top:14px}
.st-wk{margin:0 0 10px;font-size:18px;padding-bottom:8px;border-bottom:1px solid var(--border)}
.st-doc-wait .st-wait{padding:20px 0}
.st-err{max-width:760px;margin:0 auto 12px}

/* ---------------------------------------------------------------- study: practice questions */
.pq{background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow);padding:22px 24px;display:flex;flex-direction:column;gap:14px}
.pq-q{font-size:17px;font-weight:600;line-height:1.5}
.pq-opts{display:flex;flex-direction:column;gap:8px}
.pq-opt{all:unset;box-sizing:border-box;cursor:pointer;display:flex;align-items:center;gap:12px;padding:11px 14px;border:1px solid var(--border-2);border-radius:10px;font-size:14.5px;line-height:1.45}
.pq-opt:hover:not([disabled]){border-color:var(--accent);background:var(--accent-soft)}
.pq-opt:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.pq-opt[disabled]{cursor:default}
.pq-l{flex:none;width:26px;height:26px;border-radius:50%;display:grid;place-items:center;font-size:12.5px;font-weight:600;background:var(--surface-3);color:var(--text-2)}
.pq-opt.right{border-color:var(--good);background:var(--good-soft)} .pq-opt.right .pq-l{background:var(--good);color:#fff}
.pq-opt.wrong{border-color:var(--bad);background:var(--bad-soft, rgba(220,60,60,.12))} .pq-opt.wrong .pq-l{background:var(--bad);color:#fff}
.pq-opt.dim{opacity:.6}
.pq-mark{margin-left:auto;font-weight:700}
.pq-why{font-size:14px;line-height:1.5}
.pq-box{margin-top:18px}
.pq-box-h{display:flex;align-items:center;gap:10px;margin-bottom:8px} .pq-box-h h3{flex:1;margin:0;font-size:16px}
.pq-list{margin:0;padding-left:20px;font-size:13.5px;display:flex;flex-direction:column;gap:10px}
.pq-list ul{list-style:none;padding-left:4px;margin:4px 0}

#modal .a-foot{display:flex;align-items:center;gap:8px;justify-content:flex-end}

.retry-row{margin-top:8px}

.retry-row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.msg.me.failed{opacity:.75;border-style:dashed}
.typing .think-stop{margin-left:10px;font-size:12.5px}

.ap-file{flex-wrap:wrap} .ap-file .ap-keytag{order:3;flex-basis:100%;width:max-content;max-width:100%;margin-top:4px;white-space:normal}

.lang-pill{display:inline-flex;align-items:center;gap:6px;white-space:nowrap}
.lang-x{all:unset;cursor:pointer;font-size:11px;opacity:.7;padding:0 2px} .lang-x:hover{opacity:1}

/* ---------------------------------------------------------------- a quiz opened with its own link: no menu */
body.quiz-only .s-app{grid-template-columns:1fr}
body.quiz-only .s-app.working{grid-template-columns:minmax(0,1fr) minmax(340px,430px)}
body.quiz-only .s-side{display:none}
@media (max-width:900px){body.quiz-only .s-app.working{grid-template-columns:1fr}}
/* the instructor's quiz link window */
.ql-state{display:flex;flex-direction:column;gap:8px;margin:12px 0}
.ql-box{display:flex;gap:18px;align-items:flex-start;flex-wrap:wrap}
.ql-box .qr{flex:none}

/* ---------------------------------------------------------------- sign in with the university email */
.gate{position:fixed;inset:0;z-index:80;background:var(--bg);display:grid;place-items:center;padding:16px;overflow:auto}
.gate-card{max-width:440px;width:100%;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:28px 26px;box-shadow:var(--shadow-lg);text-align:center}
.gate-err{min-height:18px;color:var(--bad);font-size:13px;text-align:left;margin:-6px 0 8px}

.code-in{font-size:24px;letter-spacing:8px;text-align:center;font-weight:600}

/* ---------------------------------------------------------------- the signed-in student in the top bar */
.bb-user{max-width:300px} .bb-user .lbl{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.user-menu{min-width:240px}
.um-who{display:flex;flex-direction:column;gap:2px;padding:8px 10px 10px;border-bottom:1px solid var(--border);margin-bottom:4px;word-break:break-all}
.um-note{padding:6px 10px 2px;max-width:240px}
@media (max-width:700px){.bb-user .lbl{display:none}}

/* ---------------------------------------------------------------- 6.1: one-click help under each question; hide the tutor */
.w-qa{display:flex;flex-wrap:wrap;gap:6px;align-items:center;justify-content:flex-end}
.w-qa .chip{font-size:12.5px;padding:4px 10px}
.s-app.working.tutor-hidden{grid-template-columns:300px minmax(0,1fr)}
body.quiz-only .s-app.working.tutor-hidden{grid-template-columns:minmax(0,1fr)}
.s-app.side-closed.working.tutor-hidden{grid-template-columns:46px minmax(0,1fr)}
.s-app.working.tutor-hidden .s-main{display:none}

/* ---------------------------------------------------------------- marking: the answer key in the editor, results */
.fq .fq-opts,.fq .fq-tf,.fq .fq-key,.fq .fq-model{display:none}
.fq[data-kind="choice"] .fq-opts{display:flex}
.fq[data-kind="truefalse"] .fq-tf{display:flex}
.fq[data-kind="text"] .fq-key{display:block}
.fq[data-kind="long"] .fq-model,.fq[data-kind="code"] .fq-model{display:block}
.fq-tf{gap:14px;align-items:center;flex-wrap:wrap}
.fq-tfo{display:inline-flex;gap:6px;align-items:center;cursor:pointer}
.fq-right{display:inline-flex;align-items:center;gap:4px;cursor:pointer}
.fq-right input{accent-color:#12a150;margin:0}
.fq-opt:has(.fq-right input:checked) .fq-o{border-color:#7dd3a0;background:#e3f6ea}
.ans-bar .spacer{flex:1}
.bar-row{display:grid;grid-template-columns:minmax(0,1fr) 90px 44px;gap:8px;align-items:center;margin:4px 0;font-size:12.5px}
.bar-row .bl{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bar-row .bt{background:var(--surface-2);border-radius:4px;height:10px}
.bar-row .bt i{display:block;height:100%;background:#12a150;border-radius:4px}
.bar-row .bt i.low{background:var(--accent)}
.bar-row .bv{text-align:right}

/* the student's released results */
.w-res{max-width:760px;margin:0 auto 24px;padding:16px;border:1px solid var(--border);border-radius:12px;background:var(--surface);text-align:left}
.w-res-h{display:flex;align-items:baseline;justify-content:space-between;gap:12px}.w-res-h h3{margin:0}
.w-res-score{font-size:22px;font-weight:700}
.w-res-note{border-left:3px solid var(--accent);padding:4px 12px;margin:10px 0;white-space:pre-wrap}
.w-res-q{border-top:1px solid var(--border);padding:10px 0}
.w-res-qh{display:flex;gap:10px;align-items:baseline}.w-res-t{flex:1;white-space:pre-wrap}
.w-res-m{font-size:12.5px;font-weight:600;white-space:nowrap;padding:1px 8px;border-radius:99px;background:var(--surface-2)}
.w-res-q.correct .w-res-m{background:#e3f6ea;color:#0e6b3a}
.w-res-q.wrong .w-res-m,.w-res-q.blank .w-res-m{background:#fde7eb;color:#a3162f}
.w-res-q.partial .w-res-m{background:#fff3d6;color:#8a4b00}
.w-res-a{margin:6px 0 0 34px;padding:6px 10px;border-radius:8px;background:var(--surface-2);white-space:pre-wrap;overflow-wrap:anywhere;font-size:13px}
.w-res-c{margin:6px 0 0 34px;font-size:13px;white-space:pre-wrap}
.w-tf{flex-direction:row;gap:10px}