/* Fluent (Windows 11) look: Mica window, navigation pane, layered cards, one accent. */
:root{
  --mica:#eef1f7;--mica2:#e5eaf4;--layer:#fbfbfd;--layer2:#ffffff;--sunk:#f3f4f8;--stroke:rgba(0,0,0,.075);--stroke2:rgba(0,0,0,.15);
  --fg:#1a1a1a;--fg2:#5c5c66;--fg3:#8a8a94;--accent:#0067c0;--accent-fg:#fff;--accent-soft:rgba(0,103,192,.09);--accent-hover:#1975c5;
  --ok:#0f7b0f;--ok-soft:#dff6dd;--warn:#9d5d00;--warn-soft:#fff4ce;--bad:#c42b1c;--bad-soft:#fde7e9;--info-soft:#e8f1fb;
  --shadow:0 2px 4px rgba(0,0,0,.04),0 8px 16px rgba(0,0,0,.05);--pop:0 8px 32px rgba(0,0,0,.16),0 0 0 1px rgba(0,0,0,.05);
  --font:"Segoe UI Variable Text","Segoe UI Variable","Segoe UI",-apple-system,BlinkMacSystemFont,Roboto,"Helvetica Neue",sans-serif;
  --display:"Segoe UI Variable Display","Segoe UI Variable","Segoe UI",-apple-system,BlinkMacSystemFont,Roboto,sans-serif;
  --r:8px;--r-lg:12px;--nav:228px;color-scheme:light}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --mica:#1c1f26;--mica2:#20242c;--layer:#272a30;--layer2:#2f3238;--sunk:#22252b;--stroke:rgba(255,255,255,.07);--stroke2:rgba(255,255,255,.14);
  --fg:#fff;--fg2:#c5c5cc;--fg3:#9a9aa3;--accent:#4cc2ff;--accent-fg:#002642;--accent-soft:rgba(76,194,255,.12);--accent-hover:#6ccdff;
  --ok:#6ccb5f;--ok-soft:rgba(108,203,95,.14);--warn:#fce100;--warn-soft:rgba(252,225,0,.11);--bad:#ff99a4;--bad-soft:rgba(255,153,164,.13);--info-soft:rgba(76,194,255,.1);
  --shadow:0 2px 4px rgba(0,0,0,.2),0 8px 16px rgba(0,0,0,.16);--pop:0 8px 32px rgba(0,0,0,.5),0 0 0 1px rgba(255,255,255,.08);color-scheme:dark}}
:root[data-theme="dark"]{
  --mica:#1c1f26;--mica2:#20242c;--layer:#272a30;--layer2:#2f3238;--sunk:#22252b;--stroke:rgba(255,255,255,.07);--stroke2:rgba(255,255,255,.14);
  --fg:#fff;--fg2:#c5c5cc;--fg3:#9a9aa3;--accent:#4cc2ff;--accent-fg:#002642;--accent-soft:rgba(76,194,255,.12);--accent-hover:#6ccdff;
  --ok:#6ccb5f;--ok-soft:rgba(108,203,95,.14);--warn:#fce100;--warn-soft:rgba(252,225,0,.11);--bad:#ff99a4;--bad-soft:rgba(255,153,164,.13);--info-soft:rgba(76,194,255,.1);
  --shadow:0 2px 4px rgba(0,0,0,.2),0 8px 16px rgba(0,0,0,.16);--pop:0 8px 32px rgba(0,0,0,.5),0 0 0 1px rgba(255,255,255,.08);color-scheme:dark}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:linear-gradient(135deg,var(--mica) 0%,var(--mica2) 55%,var(--mica) 100%) fixed;color:var(--fg);font:14px/1.45 var(--font);-webkit-font-smoothing:antialiased;-webkit-text-size-adjust:100%}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
button{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--fg);outline-offset:2px;border-radius:4px}
.ic{width:16px;height:16px;flex:none}
.tnum{font-variant-numeric:tabular-nums}
.muted{color:var(--fg2)}.dim{color:var(--fg3)}.small{font-size:12.5px}
[hidden]{display:none!important}

/* ---------- shell ---------- */
#shell{display:grid;grid-template-columns:var(--nav) minmax(0,1fr);grid-template-rows:52px minmax(0,1fr);min-height:100%}
#titlebar{grid-column:1/-1;display:flex;align-items:center;gap:12px;padding:0 12px 0 16px;padding-top:env(safe-area-inset-top,0px);position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--mica) 82%,transparent);backdrop-filter:blur(20px)}
.app{display:flex;align-items:center;gap:10px;color:var(--fg2);font-size:12.5px;min-width:0}
.app:hover{text-decoration:none}
.app b{color:var(--fg);font-weight:600;font-size:13.5px}
#orgName{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:240px}
.mark{display:grid;place-items:center;width:22px;height:22px;border-radius:6px;background:linear-gradient(135deg,var(--accent),color-mix(in srgb,var(--accent) 55%,#7a5cff));color:var(--accent-fg);flex:none}
.mark.big{width:56px;height:56px;border-radius:16px}
.search{position:relative;flex:1;max-width:420px;margin:0 auto;display:flex;align-items:center;gap:8px;height:34px;padding:0 10px;border-radius:6px;background:var(--layer);border:1px solid var(--stroke);border-bottom-color:var(--stroke2);color:var(--fg3)}
.search:focus-within{border-bottom:2px solid var(--accent);background:var(--layer2)}
.search input{flex:1;min-width:0;border:0;background:none;outline:none;font:inherit;color:var(--fg)}
#sres{position:absolute;left:-1px;right:-1px;top:calc(100% + 6px);background:var(--layer2);border-radius:var(--r);box-shadow:var(--pop);padding:4px;max-height:60vh;overflow:auto;z-index:30;animation:pop .14s ease-out}
.sr{display:flex;align-items:center;gap:10px;width:100%;padding:8px 10px;border:0;background:none;border-radius:6px;text-align:left;cursor:pointer;color:var(--fg)}
.sr:hover,.sr.act{background:var(--accent-soft)}
.sr .ic{color:var(--accent)}.sr small{margin-left:auto;color:var(--fg3);font-size:12px}
.sr-empty{padding:12px;color:var(--fg2)}
.avatar-btn{border:0;background:none;padding:3px;border-radius:50%;cursor:pointer}
.avatar{display:grid;place-items:center;width:30px;height:30px;border-radius:50%;color:#fff;font:600 12px/1 var(--font);flex:none;background:linear-gradient(135deg,#0f6cbd,#8764b8)}
.avatar.lg{width:64px;height:64px;font-size:22px}
#nav{display:flex;flex-direction:column;gap:2px;padding:6px 6px 12px;position:sticky;top:52px;height:calc(100vh - 52px);overflow:auto}
#nav a{position:relative;display:flex;align-items:center;gap:12px;height:38px;padding:0 12px;border-radius:6px;color:var(--fg);font-size:14px;text-decoration:none;transition:background .12s}
#nav a:hover{background:color-mix(in srgb,var(--fg) 5%,transparent)}
#nav a.on{background:var(--layer)}
#nav a.on::before{content:"";position:absolute;left:0;top:11px;bottom:11px;width:3px;border-radius:3px;background:var(--accent);animation:grow .2s ease-out}
#nav a .ic{width:18px;height:18px;color:var(--fg2)}
#nav a.on .ic{color:var(--accent)}
#nav .sp{flex:1}
#view{background:var(--layer);border-top-left-radius:var(--r-lg);border-top:1px solid var(--stroke);border-left:1px solid var(--stroke);padding:28px 36px 64px;min-width:0;outline:none;min-height:calc(100vh - 52px)}
body.focus #nav,body.focus .search{display:none!important}
body.focus #shell{grid-template-columns:1fr}
body.focus #view{border-radius:0;border-left:0}
body.bare #shell{display:block}
body.bare #view{background:none;border:0;min-height:100vh;padding:16px}
.wrap{max-width:1180px;margin:0 auto}
.narrow{max-width:780px;margin:0 auto}
.page-in{animation:rise .22s ease-out}

/* ---------- type ---------- */
.eyebrow{font-size:12.5px;color:var(--fg2);margin:0 0 4px}
h1,.h1{font:600 28px/1.2 var(--display);margin:0;letter-spacing:-.01em;text-wrap:balance}
.sub{color:var(--fg2);margin:4px 0 0}
h2,.h2{font:600 17px/1.3 var(--display);margin:0}
h3{font:600 14.5px/1.3 var(--font);margin:0}
.crumb{display:inline-flex;align-items:center;gap:4px;color:var(--fg2);font-size:13px;margin-bottom:8px}
.crumb:hover{color:var(--fg);text-decoration:none}
.section{margin-top:28px}
.sect-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:10px;flex-wrap:wrap}

/* ---------- controls ---------- */
.cmd{display:flex;flex-wrap:wrap;align-items:center;gap:6px;margin:18px 0 22px}
.cmd .sep{width:1px;height:20px;background:var(--stroke2);margin:0 4px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:32px;padding:0 12px;border-radius:6px;border:1px solid var(--stroke);border-bottom-color:var(--stroke2);background:var(--layer2);color:var(--fg);font:400 13.5px var(--font);cursor:pointer;text-decoration:none;white-space:nowrap;transition:background .12s,transform .08s}
.btn:hover{background:var(--sunk);text-decoration:none}
.btn:active{transform:scale(.98)}
.btn:disabled{opacity:.45;cursor:default;transform:none}
.btn.primary{background:var(--accent);color:var(--accent-fg);border-color:transparent;font-weight:600}
.btn.primary:hover{background:var(--accent-hover)}
.btn.subtle{background:transparent;border-color:transparent}
.btn.subtle:hover{background:color-mix(in srgb,var(--fg) 6%,transparent)}
.btn.danger{color:var(--bad)}
.btn.danger.primary{background:var(--bad);color:#fff}
.btn.lg{height:40px;padding:0 18px;font-size:14.5px}
.btn.icon{width:32px;padding:0}
.field{display:block;margin-bottom:14px}
.field>span{display:block;font-size:13px;font-weight:600;margin-bottom:6px}
.field>small{display:block;color:var(--fg2);font-size:12.5px;margin-top:5px}
.input,input[type=text],input[type=password],input[type=url],input[type=number],input[type=datetime-local],select,textarea{width:100%;font:inherit;color:var(--fg);background:var(--layer2);border:1px solid var(--stroke);border-bottom-color:var(--stroke2);border-radius:6px;padding:7px 10px;min-height:34px;outline:none;transition:border-color .1s}
input:focus,select:focus,textarea:focus{border-bottom:2px solid var(--accent);padding-bottom:6px}
input[type=datetime-local]{-webkit-appearance:none;appearance:none;min-height:38px;text-align:left}
.dt{display:flex;gap:6px;align-items:center}.dt input{flex:1;min-width:0}
textarea{resize:vertical;min-height:84px;line-height:1.5}
select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,var(--fg2) 50%),linear-gradient(135deg,var(--fg2) 50%,transparent 50%);background-position:calc(100% - 15px) 50%,calc(100% - 10px) 50%;background-size:5px 5px;background-repeat:no-repeat;padding-right:28px}
.grid-form{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:0 16px}
/* toggle switch */
.toggle{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:12px 0;border-top:1px solid var(--stroke);cursor:pointer}
.toggle:first-child{border-top:0}
.toggle b{display:block;font-weight:600;font-size:14px}.toggle small{color:var(--fg2);font-size:12.5px}
.toggle input{appearance:none;flex:none;width:40px;height:20px;border-radius:10px;border:1px solid var(--fg2);background:transparent;position:relative;cursor:pointer;margin-top:2px;transition:background .15s,border-color .15s}
.toggle input::after{content:"";position:absolute;top:3px;left:3px;width:12px;height:12px;border-radius:50%;background:var(--fg2);transition:transform .15s,background .15s}
.toggle input:checked{background:var(--accent);border-color:var(--accent)}
.toggle input:checked::after{transform:translateX(20px);background:var(--accent-fg)}
/* segmented */
.seg{display:inline-flex;flex-wrap:wrap;gap:2px;padding:3px;border-radius:var(--r);background:var(--sunk);border:1px solid var(--stroke)}
.seg label{position:relative;cursor:pointer}
.seg input{position:absolute;opacity:0;pointer-events:none}
.seg span{display:block;padding:6px 12px;border-radius:6px;color:var(--fg2);font-size:13px;font-weight:500;transition:.12s}
.seg input:checked+span{background:var(--layer2);color:var(--fg);box-shadow:0 1px 2px rgba(0,0,0,.08),0 0 0 1px var(--stroke)}
.seg input:focus-visible+span{outline:2px solid var(--fg)}
/* number box */
.num{display:flex;align-items:stretch}
.num input{border-radius:6px 0 0 6px;text-align:left;-moz-appearance:textfield}
.num input::-webkit-inner-spin-button{appearance:none}
.num button{width:34px;border:1px solid var(--stroke);border-left:0;background:var(--layer2);cursor:pointer;display:grid;place-items:center;color:var(--fg2)}
.num button:last-child{border-radius:0 6px 6px 0}
.num button:hover{background:var(--sunk)}

/* ---------- surfaces ---------- */
.card{background:var(--layer2);border:1px solid var(--stroke);border-radius:var(--r);box-shadow:var(--shadow)}
.pad{padding:20px}
.tiles{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:12px}
.tile{padding:16px;min-width:0}
.tile .lbl{display:flex;align-items:center;gap:8px;color:var(--fg2);font-size:12.5px}
.tile .lbl .ic{color:var(--accent)}
.tile .val{font:600 28px/1.1 var(--display);margin:10px 0 4px}
.tile .note{font-size:12.5px;color:var(--fg3);overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}
.spark{display:block;width:100%;height:30px;margin-top:6px}
.split{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,1fr);gap:20px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:12px}
.list{display:grid;gap:8px}
.row-card{display:grid;grid-template-columns:40px minmax(0,1fr) auto;gap:14px;align-items:center;padding:12px 14px;color:var(--fg);text-decoration:none;transition:border-color .15s,transform .12s}
a.row-card:hover,button.row-card:hover{border-color:var(--stroke2);text-decoration:none}
button.row-card{width:100%;text-align:left;cursor:pointer;font:inherit}
.row-card .tic{width:40px;height:40px;border-radius:8px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent)}
.row-card .tic .ic{width:20px;height:20px}
.row-card b{display:block;font-weight:600;font-size:14.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row-card small{color:var(--fg2);font-size:12.5px}
.row-card .end{display:flex;align-items:center;gap:10px}
.tcard{display:flex;flex-direction:column;gap:10px;padding:16px;color:var(--fg);text-decoration:none;transition:border-color .15s,transform .12s}
a.tcard:hover{border-color:var(--stroke2);text-decoration:none;transform:translateY(-1px)}
.tcard .top{display:flex;align-items:flex-start;gap:12px}
.tcard .top .tic{width:38px;height:38px;border-radius:8px;display:grid;place-items:center;background:var(--accent-soft);color:var(--accent);flex:none}
.tcard b{font-size:15px;font-weight:600;line-height:1.3}
.tcard .meta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;color:var(--fg2);font-size:12.5px}
.tcard .foot{display:flex;gap:6px;margin-top:auto;padding-top:4px}
.pill{display:inline-flex;align-items:center;gap:6px;height:22px;padding:0 9px;border-radius:999px;font-size:12px;font-weight:600;white-space:nowrap}
.pill i{width:7px;height:7px;border-radius:50%;background:currentColor}
.p-ok{background:var(--ok-soft);color:var(--ok)}.p-warn{background:var(--warn-soft);color:var(--warn)}.p-bad{background:var(--bad-soft);color:var(--bad)}.p-mute{background:var(--sunk);color:var(--fg2)}.p-acc{background:var(--accent-soft);color:var(--accent)}
.mini{display:flex;align-items:center;gap:8px;font-size:12.5px;color:var(--fg2)}
.track{height:4px;border-radius:4px;background:var(--sunk);overflow:hidden;min-width:60px;flex:1}
.track i{display:block;height:100%;background:var(--accent);border-radius:4px;transition:width .4s}
.track.bad i{background:var(--bad)}
.infobar{display:flex;gap:10px;align-items:flex-start;padding:11px 14px;border-radius:var(--r);border:1px solid var(--stroke);font-size:13.5px;margin:14px 0;background:var(--info-soft)}
.infobar .ic{width:18px;height:18px;margin-top:1px;color:var(--accent)}
.infobar.warn{background:var(--warn-soft)}.infobar.warn .ic{color:var(--warn)}
.infobar.bad{background:var(--bad-soft)}.infobar.bad .ic{color:var(--bad)}
.infobar.ok{background:var(--ok-soft)}.infobar.ok .ic{color:var(--ok)}
.infobar div{white-space:pre-line;min-width:0}
.empty{display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center;padding:40px 20px;color:var(--fg2);border:1px dashed var(--stroke2);border-radius:var(--r);background:var(--layer)}
.empty .ic{width:36px;height:36px;color:var(--fg3)}
.empty b{color:var(--fg);font-size:15px}
/* tables */
.tw{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:13.5px}
th{font-weight:600;font-size:12px;color:var(--fg2);text-align:left;padding:10px 14px;border-bottom:1px solid var(--stroke);white-space:nowrap;user-select:none}
th[data-sort]{cursor:pointer}th[data-sort]:hover{color:var(--fg)}
th .arrow{display:inline-block;width:10px;margin-left:4px;color:var(--accent)}
td{padding:10px 14px;border-bottom:1px solid var(--stroke);vertical-align:middle}
tbody tr:last-child td{border-bottom:0}
tbody tr{transition:background .1s}
tbody tr:hover td{background:color-mix(in srgb,var(--accent) 5%,transparent)}
tr[data-href]{cursor:pointer}
td.act{width:44px;text-align:right;padding:4px 8px}
.who{display:flex;align-items:center;gap:10px;min-width:0}
.who .avatar{width:28px;height:28px;font-size:11px}
.who b{font-weight:600;display:block}.who small{color:var(--fg3);font-size:12px}
/* skeleton */
.sk{border-radius:6px;background:linear-gradient(90deg,var(--sunk) 0%,var(--layer2) 50%,var(--sunk) 100%);background-size:200% 100%;animation:shimmer 1.2s linear infinite}

/* ---------- lesson ---------- */
.prose{font-size:16.5px;line-height:1.7;max-width:70ch}
.prose h2{font-size:21px;margin:26px 0 8px}.prose h3{font-size:18px;margin:22px 0 6px}.prose h4{font-size:16px;margin:18px 0 6px}
.prose img{max-width:100%;border-radius:var(--r)}
.prose code{background:var(--sunk);padding:1px 5px;border-radius:4px;font-size:.92em}
.prose ul,.prose ol{padding-left:22px}
.video{position:relative;aspect-ratio:16/9;max-width:100%;margin:18px 0;border-radius:var(--r);overflow:hidden;background:#000;box-shadow:var(--shadow)}
.video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}

/* ---------- exam editor ---------- */
.q-card{margin-bottom:8px;transition:box-shadow .15s,opacity .15s}
.q-card.drag{opacity:.4}
.q-card.over{box-shadow:0 -3px 0 var(--accent),var(--shadow)}
.q-head{display:flex;align-items:center;gap:10px;padding:10px 12px;cursor:pointer;min-width:0}
.q-head .handle{cursor:grab;color:var(--fg3);display:grid;place-items:center;width:20px}
.q-head .n{font-weight:700;color:var(--accent);min-width:28px}
.q-head .txt{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.q-head .txt.none{color:var(--fg3);font-style:italic}
.q-head .chev{color:var(--fg3);transition:transform .15s}
.q-card.open .q-head .chev{transform:rotate(180deg)}
.q-body{display:none;padding:4px 16px 16px 52px}
.q-card.open .q-body{display:block;animation:rise .15s ease-out}
.q-row{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-bottom:12px}
.q-row .field{margin:0}
.opt-ed{display:flex;align-items:center;gap:8px;margin-bottom:6px}
.opt-ed .ltr{width:24px;height:24px;border-radius:6px;display:grid;place-items:center;font-weight:600;font-size:12px;background:var(--sunk);color:var(--fg2);flex:none}
.opt-ed input[type=text]{flex:1;min-width:0}
.opt-ed .mark-ok{display:flex;align-items:center;gap:6px;font-size:12.5px;color:var(--fg2);white-space:nowrap;cursor:pointer}
.opt-ed .mark-ok input{width:16px;height:16px;accent-color:var(--accent)}
.opt-ed.right .ltr{background:var(--ok);color:#fff}
/* pictures in questions */
.qimg{display:block;max-width:100%;max-height:360px;width:auto;height:auto;border-radius:8px;margin:0 0 16px;background:var(--sunk);object-fit:contain}
.qimg-prev .qimg{max-height:160px;margin:-4px 0 12px}
.qimg.broken{display:none}
.qimg-prev:has(.broken)::after{content:"Couldn’t load this picture. Check the link opens the picture itself.";display:block;color:var(--bad);font-size:12.5px;margin:-6px 0 12px}
.q-head .has-img{display:grid;place-items:center;color:var(--fg3)}
.q-head .has-img .ic{width:16px;height:16px}
.ritem .qimg{max-height:220px}
/* question bank */
.bank{max-height:52vh;overflow:auto;border:1px solid var(--stroke);border-radius:8px}
.bank-h{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:6px 8px 6px 12px;position:sticky;top:0;z-index:1;background:var(--layer2,var(--layer));border-bottom:1px solid var(--stroke)}
.bank-ex+.bank-ex{border-top:1px solid var(--stroke)}
.bank .pick-row{align-items:flex-start;padding:8px 12px}
.bank .pick-row input{margin-top:2px}
.bank .pick-row small{display:block;color:var(--fg3);font-size:12px;margin-top:2px}
.bank-q{display:block;font-weight:500;white-space:normal;overflow-wrap:anywhere}
/* notification offer */
.infobar .offer{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;white-space:normal;width:100%}
.infobar>div:has(.offer){flex:1}
.offer-btns{display:flex;gap:6px;flex:none}
.savebar{position:sticky;bottom:0;z-index:5;display:flex;gap:8px;align-items:center;justify-content:flex-end;padding:14px 0 calc(14px + env(safe-area-inset-bottom,0px));margin-top:18px;background:linear-gradient(transparent,var(--layer) 35%)}
.savebar .msg{margin-right:auto;color:var(--fg2);font-size:13px}

/* ---------- taking an exam ---------- */
.exam-top{display:flex;align-items:center;gap:16px;margin-bottom:16px}
.exam-top .t{flex:1;min-width:0}
.exam-top h1{font-size:22px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ring{position:relative;width:66px;height:66px;flex:none}
.ring svg{width:66px;height:66px;transform:rotate(-90deg)}
.ring circle{transition:stroke-dashoffset .5s linear,stroke .3s}
.ring .txt{position:absolute;inset:0;display:grid;place-items:center;font:600 14px var(--font);font-variant-numeric:tabular-nums}
.ring.low .txt{color:var(--bad)}
.progress{height:4px;border-radius:4px;background:var(--sunk);overflow:hidden;margin-bottom:16px}
.progress i{display:block;height:100%;background:var(--accent);border-radius:4px;transition:width .3s}
.qcard{padding:28px}
.qmeta{display:flex;flex-wrap:wrap;gap:6px;align-items:center;color:var(--fg2);font-size:12.5px;margin-bottom:10px}
.qtext{font:600 21px/1.4 var(--display);margin:0 0 22px;white-space:pre-wrap;overflow-wrap:anywhere}
.opts{display:grid;gap:10px}
.opt{display:flex;align-items:center;gap:14px;width:100%;text-align:left;padding:14px 16px;border-radius:var(--r);border:1px solid var(--stroke);border-bottom-color:var(--stroke2);background:var(--layer);color:var(--fg);font:400 15.5px/1.4 var(--font);cursor:pointer;transition:background .12s,border-color .12s,transform .08s;overflow-wrap:anywhere}
.opt:hover{background:var(--accent-soft)}
.opt:active{transform:scale(.995)}
.opt .k{width:30px;height:30px;border-radius:6px;display:grid;place-items:center;font-weight:600;background:var(--sunk);color:var(--fg2);flex:none;transition:.12s}
.opt.multi .k{border-radius:5px}
.opt[aria-checked="true"]{border-color:var(--accent);background:var(--accent-soft);box-shadow:inset 0 0 0 1px var(--accent)}
.opt[aria-checked="true"] .k{background:var(--accent);color:var(--accent-fg)}
.answer-input{font-size:17px!important;padding:12px 14px!important;min-height:48px!important}
.qnav{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px;flex-wrap:wrap}
.saved{display:inline-flex;align-items:center;gap:6px;color:var(--fg3);font-size:12.5px}
.saved .ic{color:var(--ok)}.saved.err .ic{color:var(--warn)}
.dots{display:flex;gap:6px;flex-wrap:wrap}
.dots button{width:30px;height:30px;border-radius:6px;display:grid;place-items:center;font-size:12px;font-weight:600;background:var(--layer2);border:1px solid var(--stroke);color:var(--fg2);cursor:pointer;padding:0}
.dots button.done{background:var(--accent-soft);color:var(--accent);border-color:transparent}
.dots button.cur{outline:2px solid var(--accent);outline-offset:1px;color:var(--fg)}

/* ---------- result ---------- */
.res{display:grid;grid-template-columns:auto minmax(0,1fr);gap:28px;align-items:center;padding:28px}
.big{position:relative;width:150px;height:150px}
.big svg{width:150px;height:150px;transform:rotate(-90deg)}
.big .prog{transition:stroke-dashoffset 1.1s cubic-bezier(.2,.8,.2,1)}
.big .txt{position:absolute;inset:0;display:grid;place-items:center;text-align:center}
.big .txt b{font:600 36px/1 var(--display)}
.big .txt small{display:block;color:var(--fg2);font-size:12px;margin-top:4px}
.facts{display:flex;flex-wrap:wrap;gap:24px;margin-top:14px}
.facts div{font-size:12.5px;color:var(--fg2)}
.facts b{display:block;font:600 18px var(--display);color:var(--fg)}
.ritem{overflow:hidden;margin-bottom:8px}
.ritem summary{display:flex;align-items:center;gap:12px;padding:12px 16px;cursor:pointer;list-style:none}
.ritem summary::-webkit-details-marker{display:none}
.ritem .st{width:24px;height:24px;border-radius:50%;display:grid;place-items:center;flex:none}
.ritem .st .ic{width:13px;height:13px}
.ritem .q{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ritem .chev{color:var(--fg3);transition:transform .15s}
.ritem[open] .chev{transform:rotate(180deg)}
.ritem .body{padding:0 16px 14px 52px;color:var(--fg2);font-size:13.5px}
.ritem .body .full{color:var(--fg);margin:0 0 8px;white-space:pre-wrap}
.ritem .body p{margin:4px 0}
.right{color:var(--ok);font-weight:600}.wrong{color:var(--bad);text-decoration:line-through}

/* ---------- sign in ---------- */
.login{min-height:calc(100vh - 32px);display:grid;place-items:center}
.login .card{width:min(400px,100%);padding:32px 28px}
.login .mark.big{margin:0 auto 16px}
.login h1{text-align:center;font-size:24px}
.login .sub{text-align:center;margin-bottom:22px}
.loading-screen{min-height:70vh;display:grid;place-items:center}
.loading-screen .mark{animation:pulse 1.2s ease-in-out infinite}

/* ---------- overlays ---------- */
#modal{position:fixed;inset:0;z-index:50;display:grid;place-items:center;padding:16px;background:rgba(0,0,0,.32);animation:fade .15s ease-out}
.dialog{width:min(480px,100%);max-height:90vh;overflow:auto;background:var(--layer2);border-radius:var(--r-lg);box-shadow:var(--pop);animation:pop .18s cubic-bezier(.2,.8,.2,1)}
.dialog .d-body{padding:24px}
.dialog h2{font-size:20px;margin-bottom:10px}
.dialog p{margin:0 0 12px;color:var(--fg2)}
.dialog .d-foot{display:flex;justify-content:flex-end;gap:8px;padding:16px 24px;background:var(--sunk);border-top:1px solid var(--stroke)}
.dialog .d-foot .btn{min-width:100px}
.dialog.wide{width:min(720px,100%)}
#menu{position:fixed;z-index:60;min-width:200px;padding:4px;background:var(--layer2);border-radius:var(--r);box-shadow:var(--pop);animation:pop .12s ease-out}
#menu button{display:flex;align-items:center;gap:10px;width:100%;padding:8px 12px;border:0;background:none;border-radius:5px;text-align:left;cursor:pointer;font-size:13.5px;color:var(--fg)}
#menu button:hover,#menu button:focus-visible{background:color-mix(in srgb,var(--fg) 6%,transparent);outline:none}
#menu button.danger{color:var(--bad)}
#menu .ic{color:var(--fg2)}#menu .danger .ic{color:var(--bad)}
#menu hr{border:0;border-top:1px solid var(--stroke);margin:4px 0}
#menu .mhead{padding:10px 12px 8px;display:flex;gap:10px;align-items:center}
#menu .mhead b{display:block}#menu .mhead small{color:var(--fg2);font-size:12px}
#toasts{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:70;display:flex;flex-direction:column;gap:8px;align-items:flex-end;pointer-events:none}
.toast{display:flex;align-items:center;gap:10px;padding:12px 16px;border-radius:var(--r);background:var(--layer2);box-shadow:var(--pop);max-width:min(380px,calc(100vw - 32px));animation:slide .22s cubic-bezier(.2,.8,.2,1);font-size:13.5px}
.toast .ic{width:18px;height:18px;color:var(--ok)}
.toast.err .ic{color:var(--bad)}
.toast.out{opacity:0;transform:translateY(8px);transition:.2s}

@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes pop{from{opacity:0;transform:scale(.96)}to{opacity:1;transform:none}}
@keyframes fade{from{opacity:0}}
@keyframes slide{from{opacity:0;transform:translateY(12px)}}
@keyframes grow{from{transform:scaleY(.3)}}
@keyframes shimmer{to{background-position:-200% 0}}
@keyframes pulse{50%{transform:scale(.92);opacity:.7}}

/* ---------- responsive ---------- */
@media (max-width:980px){
  #shell{grid-template-columns:56px minmax(0,1fr)}
  #nav a{justify-content:center;padding:0}
  #nav a span{display:none}
  #nav a.on::before{top:11px;bottom:11px}
  #view{padding:24px 20px 64px}
  .split{grid-template-columns:1fr}
  #orgName{display:none}
}
@media (max-width:620px){
  #shell{grid-template-columns:1fr;grid-template-rows:52px minmax(0,1fr)}
  #nav{position:fixed;left:0;right:0;bottom:0;top:auto;height:auto;z-index:20;flex-direction:row;justify-content:space-around;padding:4px 4px calc(4px + env(safe-area-inset-bottom,0px));background:color-mix(in srgb,var(--layer) 92%,transparent);backdrop-filter:blur(20px);border-top:1px solid var(--stroke)}
  #nav .sp{display:none}
  #nav a{flex:1;flex-direction:column;gap:2px;height:52px;font-size:10.5px}
  #nav a span{display:block}
  #nav a.on{background:none}
  #nav a.on::before{left:30%;right:30%;top:auto;bottom:2px;width:auto;height:3px}
  #view{border-radius:0;border-left:0;padding:20px 16px 96px}
  body.focus #view{padding-bottom:40px}
  .search{max-width:none}
  h1,.h1{font-size:24px}
  .tiles{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tile .val{font-size:24px}
  .qcard{padding:20px}.qtext{font-size:18.5px}
  .res{grid-template-columns:1fr;justify-items:center;text-align:center}.facts{justify-content:center}
  .q-body{padding-left:16px}
  .q-head{flex-wrap:wrap;row-gap:2px;padding:10px 8px 10px 10px;gap:8px}
  .q-head .txt{order:10;flex-basis:100%;white-space:normal;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;padding:0 4px 0 36px}
  .q-head .has-img{margin-left:auto}
  .q-head .has-img[hidden]+.pill,.q-head .has-img[hidden]~.pill{margin-left:auto}
  .row-card .end .mini{display:none}
  .savebar{padding-bottom:calc(76px + env(safe-area-inset-bottom,0px))}
  body.focus .savebar{padding-bottom:14px}
  #toasts{left:16px;right:16px;bottom:calc(76px + env(safe-area-inset-bottom,0px));align-items:stretch}
  .dialog .d-foot{flex-wrap:wrap}.dialog .d-foot .btn{flex:1}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}}
@media print{#titlebar,#nav,.cmd,.no-print,.savebar,#toasts{display:none!important}#shell{display:block}#view{border:0;padding:0;background:#fff}body{background:#fff}.card{box-shadow:none}}

/* ---------- student picker, charts ---------- */
.picker{margin:4px 0 8px;border:1px solid var(--stroke);border-radius:var(--r);background:var(--layer);overflow:hidden}
.picker-bar{display:flex;flex-wrap:wrap;gap:6px;align-items:center;padding:8px;border-bottom:1px solid var(--stroke);background:var(--sunk)}
.search.sm{flex:1;min-width:160px;max-width:none;margin:0;height:32px}
.picker-list{max-height:280px;overflow:auto;padding:4px}
.pick-row{display:flex;align-items:center;gap:10px;padding:7px 8px;border-radius:6px;cursor:pointer}
.pick-row:hover{background:color-mix(in srgb,var(--accent) 6%,transparent)}
.pick-row input{width:17px;height:17px;accent-color:var(--accent);flex:none}
.pick-row .avatar{width:28px;height:28px;font-size:11px}
.pick-row b{display:block;font-weight:600;font-size:13.5px}.pick-row small{color:var(--fg3);font-size:12px}
.chart{display:block;width:100%;height:auto;overflow:visible}
.ritem .body .tw table td{padding:8px 10px}
.ritem .body tr[data-href]{cursor:pointer}