:root{
  --brand:#F8441E;--brand-d:#E03812;--brand-soft:#FEEDE8;--brand-ink:#C2330F;
  --ink:#1A1A1A;--bg:#F5F2EF;--surface:#fff;--line:#E8E1DA;--line-2:#D9D0C7;
  --text:#1A1A1A;--muted:#6F6862;--faint:#9C948C;
  --ok:#0F7B3F;--ok-bg:#E8F6EE;--warn:#A85A00;--warn-bg:#FFF3DF;--bad:#B42318;--bad-bg:#FDECEA;--info:#1D4ED8;--info-bg:#E8EFFE;
  --r:20px;--r-md:14px;--r-sm:12px;
  --shadow:0 1px 2px rgba(60,40,20,.04),0 6px 24px rgba(60,40,20,.06);
  --shadow-lg:0 2px 6px rgba(60,40,20,.06),0 20px 50px rgba(60,40,20,.12);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;font:15px/1.55 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}
h1,h2,h3,p{margin:0}
a{color:inherit}
img{max-width:100%}
button{font:inherit}
.muted{color:var(--muted)}.small{font-size:13px}.tiny{font-size:12px}
.linklike{background:none;border:0;color:inherit;text-decoration:underline;cursor:pointer;padding:0;font-size:inherit}
.ico{width:18px;height:18px;flex:none;stroke:currentColor;fill:none;stroke-width:1.75;stroke-linecap:round;stroke-linejoin:round}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:var(--r-sm);padding:11px 20px;font-weight:600;font-size:14.5px;cursor:pointer;text-decoration:none;border:1px solid var(--line-2);background:var(--surface);color:var(--ink);transition:background .12s,border-color .12s,box-shadow .12s,transform .12s;white-space:nowrap}
.btn:hover{border-color:var(--ink)}
.btn:active{transform:translateY(1px)}
.btn:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,button:focus-visible{outline:3px solid rgba(248,68,30,.3);outline-offset:2px}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 6px 16px rgba(248,68,30,.28)}
.btn.primary:hover{background:var(--brand-d);border-color:var(--brand-d)}
.btn.dark{background:var(--ink);border-color:var(--ink);color:#fff}.btn.dark:hover{background:#000}
.btn.ghost{border-color:transparent;background:transparent}.btn.ghost:hover{background:rgba(26,26,26,.06);border-color:transparent}
.btn.danger{color:var(--bad);border-color:#F1C8C2}.btn.danger:hover{background:var(--bad-bg);border-color:var(--bad)}
.btn.sm{padding:8px 14px;font-size:13px;border-radius:10px}.btn.lg{padding:14px 24px;font-size:15px}.btn.block{width:100%}

/* form */
label{display:block;font-size:13.5px;font-weight:600;margin:0 0 7px}
input[type=text],input[type=email],input[type=password],input[type=url],input[type=number],input[type=datetime-local],textarea{width:100%;padding:12px 14px;border:1px solid var(--line-2);border-radius:var(--r-sm);background:#fff;color:var(--text);font:inherit;transition:border-color .12s,box-shadow .12s}
input::placeholder,textarea::placeholder{color:#A9A199}
input:focus,textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px rgba(248,68,30,.13)}
input[type=file]{width:100%;padding:16px;border:1.5px dashed var(--line-2);border-radius:var(--r-sm);background:#FCFBF9;font:inherit;cursor:pointer}
input[type=file]::file-selector-button{margin-right:14px;border:0;border-radius:10px;background:var(--ink);color:#fff;padding:8px 14px;font-weight:600;cursor:pointer}
textarea{resize:vertical}
.field{margin-bottom:18px}
.hint{font-size:12.5px;color:var(--faint);margin-top:6px}
.row{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px}
.check{display:flex;gap:10px;align-items:flex-start;font-weight:400;font-size:14px;cursor:pointer}
.check input{margin-top:3px;accent-color:var(--brand);width:16px;height:16px}

/* alerts */
.alert{display:flex;gap:10px;align-items:center;padding:12px 16px;border-radius:var(--r-sm);margin-bottom:20px;font-size:14px;font-weight:500}
.alert.err{background:var(--bad-bg);color:var(--bad)}.alert.ok{background:var(--ok-bg);color:var(--ok)}

/* badges */
.badge{display:inline-flex;align-items:center;gap:6px;border-radius:999px;padding:4px 11px;font-size:12px;font-weight:600;background:#EEE9E3;color:var(--muted);white-space:nowrap}
.badge:before{content:"";width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.8}
.b-submitted{background:var(--info-bg);color:var(--info)}.b-late{background:var(--warn-bg);color:var(--warn)}.b-graded{background:var(--ok-bg);color:var(--ok)}.b-missed{background:var(--bad-bg);color:var(--bad)}

/* cards */
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:26px;box-shadow:var(--shadow)}
.stack>*+*{margin-top:16px}
.card h2{font-size:16px;font-weight:700;letter-spacing:-.01em;margin-bottom:16px;display:flex;align-items:center;gap:10px}

.avatar{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;font-weight:700;font-size:13px;background:var(--brand-soft);color:var(--brand-ink);flex:none}
.avatar.lg{width:52px;height:52px;font-size:17px}

/* ============ APP LAYOUT ============ */
.apphead{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.apphead .in{max-width:1080px;margin:0 auto;padding:0 28px;height:68px;display:flex;align-items:center;gap:32px}
.apphead .brand img{height:38px;width:auto;display:block}
.topnav{display:flex;gap:4px;flex:1}
.topnav a{display:flex;align-items:center;gap:8px;padding:9px 14px;border-radius:10px;text-decoration:none;font-weight:600;font-size:14px;color:var(--muted);transition:background .12s,color .12s}
.topnav a:hover{background:#F3EFEB;color:var(--ink)}
.topnav a.on{background:var(--brand-soft);color:var(--brand-ink)}
.usr{display:flex;align-items:center;gap:12px;margin-left:auto}
.usr .who{line-height:1.25;text-align:right}.usr .who b{display:block;font-size:14px}.usr .who span{font-size:12px;color:var(--muted);text-transform:capitalize}
.usr button{background:none;border:1px solid var(--line-2);color:var(--muted);cursor:pointer;font-size:13px;font-weight:600;padding:8px 14px;border-radius:10px}.usr button:hover{color:var(--ink);border-color:var(--ink)}
.content{max-width:1080px;margin:0 auto;padding:36px 28px 90px}
.tabbar{display:none}
.pagehead{display:flex;justify-content:space-between;align-items:flex-end;gap:16px;flex-wrap:wrap;margin-bottom:26px}
.pagehead h1{font-size:30px;font-weight:700;letter-spacing:-.025em;line-height:1.15}
.pagehead p{color:var(--muted);margin-top:6px}
.back{display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:600;color:var(--muted);text-decoration:none;margin-bottom:14px}.back:hover{color:var(--ink)}
.sectiontitle{font-size:12.5px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--faint);margin:34px 0 14px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px 22px;box-shadow:var(--shadow)}
.stat .k{font-size:13.5px;font-weight:500;color:var(--muted);margin-bottom:10px}
.stat .v{font-size:34px;font-weight:700;letter-spacing:-.03em;line-height:1.05}
.stat .v small{font-size:15px;color:var(--faint);font-weight:600;letter-spacing:0}
.stat.hot{background:var(--brand);border-color:var(--brand);color:#fff;box-shadow:0 10px 24px rgba(248,68,30,.25)}.stat.hot .k{color:rgba(255,255,255,.85)}

/* assignment cards */
.acard{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px 24px;text-decoration:none;box-shadow:var(--shadow);transition:transform .14s,box-shadow .14s,border-color .14s;position:relative;overflow:hidden}
.acard+.acard{margin-top:12px}
.acard:before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--line-2)}
.acard.s-todo:before{background:var(--brand)}.acard.s-graded:before{background:var(--ok)}.acard.s-submitted:before{background:var(--info)}.acard.s-late:before{background:var(--warn)}.acard.s-missed:before{background:var(--bad)}
.acard:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.eyebrow{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--brand-ink)}
.acard h3{font-size:17px;font-weight:700;letter-spacing:-.01em;margin:2px 0 8px}
.meta{display:flex;gap:14px;flex-wrap:wrap;align-items:center;color:var(--muted);font-size:13px}
.meta span{display:inline-flex;align-items:center;gap:6px}.meta .ico{width:15px;height:15px}
.meta .urgent{color:var(--brand-ink);font-weight:700}
.acard .right{display:flex;align-items:center;gap:14px}
.grade{font-weight:700;font-size:20px;letter-spacing:-.02em}.grade small{font-size:13px;color:var(--faint);font-weight:600}
.bar{height:8px;border-radius:99px;background:#EEE9E3;overflow:hidden;margin-top:12px}.bar i{display:block;height:100%;background:var(--brand);border-radius:99px}
.bar.green i{background:var(--ok)}

/* detail layout */
.split{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:20px;align-items:start}
.sticky{position:sticky;top:90px}
.kv{display:flex;justify-content:space-between;gap:12px;padding:12px 0;border-bottom:1px solid var(--line);font-size:14px}.kv:last-child{border:0}.kv span:first-child{color:var(--muted)}.kv b{text-align:right}
.countdown{font-size:30px;font-weight:700;letter-spacing:-.03em;line-height:1.1}.countdown.urgent{color:var(--brand)}
.prose{white-space:pre-wrap;color:#2B2926;line-height:1.7}
.gradecard{background:linear-gradient(160deg,#16A34A,#0F7B3F);border:0;color:#fff}
.gradecard h2,.gradecard h2 .ico{color:#fff}
.gradecard .score{font-size:56px;font-weight:700;letter-spacing:-.04em;line-height:1}.gradecard .score small{font-size:20px;opacity:.75;font-weight:600}
.gradecard .fb{margin-top:16px;padding-top:16px;border-top:1px solid rgba(255,255,255,.25);font-size:14px;white-space:pre-wrap}
.box{background:#FBF9F7;border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 16px;font-size:14px;margin-bottom:18px}
.filechip{display:inline-flex;align-items:center;gap:8px;background:#fff;border:1px solid var(--line-2);border-radius:10px;padding:6px 12px;font-weight:600;font-size:13px;text-decoration:none}

/* videos */
.videos{display:grid;gap:18px}
.vid .t{font-weight:600;margin-bottom:8px;display:flex;gap:8px;align-items:center}
.vid .n{width:22px;height:22px;border-radius:50%;background:var(--ink);color:#fff;font-size:12px;display:grid;place-items:center;flex:none}
.player{position:relative;aspect-ratio:16/9;border-radius:var(--r-md);overflow:hidden;background:#201E1C;cursor:pointer;border:0;padding:0;width:100%;display:block}
.player img{width:100%;height:100%;object-fit:cover;opacity:.9;transition:opacity .2s,transform .4s}
.player:hover img{opacity:1;transform:scale(1.03)}
.player .play{position:absolute;inset:0;display:grid;place-items:center}
.player .play i{width:66px;height:66px;border-radius:50%;background:var(--brand);display:grid;place-items:center;box-shadow:0 10px 30px rgba(248,68,30,.5);transition:transform .15s}
.player:hover .play i{transform:scale(1.08)}
.player .play svg{width:26px;height:26px;fill:#fff;margin-left:3px}
.player iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.linkrow{display:flex;align-items:center;gap:12px;padding:14px 16px;border:1px solid var(--line);border-radius:var(--r-sm);text-decoration:none;font-weight:600;font-size:14px}.linkrow:hover{border-color:var(--ink)}
.empty{text-align:center;padding:34px 16px;color:var(--muted);border:1.5px dashed var(--line-2);border-radius:var(--r);background:rgba(255,255,255,.55)}
.empty b{display:block;color:var(--text);margin-bottom:4px}

/* table */
.tablecard{padding:0;overflow:hidden}
.table{width:100%;border-collapse:collapse;font-size:14px}
.table th{text-align:left;font-size:12px;font-weight:600;letter-spacing:.05em;text-transform:uppercase;color:var(--faint);padding:14px 16px;background:#FBF9F7;border-bottom:1px solid var(--line)}
.table td{padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:middle}
.table tr:last-child td{border:0}
.person{display:flex;align-items:center;gap:12px}.person b{display:block;font-weight:600}.person span{font-size:12.5px;color:var(--muted)}
.tablewrap{overflow-x:auto}
.vrow{display:grid;grid-template-columns:1fr 2fr auto;gap:10px;margin-bottom:10px}

/* ============ PUBLIC ============ */
.pub{min-height:100vh;display:flex;flex-direction:column}
.pubnav{display:flex;align-items:center;justify-content:space-between;max-width:1120px;width:100%;margin:0 auto;padding:20px 28px}
.pubnav img{height:40px;display:block}
.pubnav nav{display:flex;align-items:center;gap:10px}
.foot{border-top:1px solid var(--line);padding:24px 28px;text-align:center;color:var(--faint);font-size:13px;margin-top:auto}

/* ============ AUTH (centered card) ============ */
.authpage{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px 16px}
.authcard{width:100%;max-width:440px;background:#fff;border:1px solid var(--line);border-radius:24px;padding:36px;box-shadow:var(--shadow-lg)}
.authcard .logo{display:block;margin-bottom:24px}.authcard .logo img{height:44px;display:block}
.authcard h1{font-size:28px;font-weight:700;letter-spacing:-.03em;margin-bottom:6px}
.authcard .sub{color:var(--muted);margin-bottom:24px}
.authcard .note{font-size:13px;color:var(--muted);margin:18px 0 12px}
.authcard .opts{display:grid;gap:10px}.authcard .opts.two{grid-template-columns:1fr 1fr}
.authcard .or{display:flex;align-items:center;gap:12px;margin:22px 0 14px;font-size:13px;color:var(--faint)}.authcard .or:before,.authcard .or:after{content:"";flex:1;height:1px;background:var(--line)}
.authcard .help{font-size:13px;color:var(--muted);margin-top:22px;line-height:1.6}
.authcard .help a{color:var(--brand-ink);font-weight:700;text-decoration:none}.authcard .help a:hover{text-decoration:underline}
.authback{margin-top:20px;font-size:13px;color:var(--muted);text-decoration:none}.authback:hover{color:var(--ink)}

.demo-chip{position:fixed;right:14px;bottom:14px;z-index:50;background:rgba(26,26,26,.92);color:#E9E5E0;font-size:12px;padding:8px 14px;border-radius:999px;box-shadow:var(--shadow-lg);backdrop-filter:blur(6px)}
.demo-chip .linklike{color:#fff;font-weight:700}

/* ============ RESPONSIVE ============ */
@media (max-width:1000px){
    .split{grid-template-columns:1fr}.sticky{position:static}
}
@media (max-width:760px){
  .apphead .in{padding:0 16px;height:60px;gap:12px}
  .apphead .brand img{height:34px}
  .topnav,.usr .who{display:none}
  .tabbar{display:flex;position:fixed;left:0;right:0;bottom:0;z-index:30;background:#fff;border-top:1px solid var(--line);padding:6px 8px calc(6px + env(safe-area-inset-bottom));box-shadow:0 -6px 24px rgba(60,40,20,.07)}
  .tabbar a{flex:1;display:flex;align-items:center;justify-content:center;padding:13px 4px;border-radius:12px;text-decoration:none;font-size:13.5px;font-weight:600;color:var(--muted)}
    .tabbar a.on{color:var(--brand-ink);background:var(--brand-soft)}
  .content{padding:22px 16px 110px}
  .pagehead h1{font-size:25px}
  .acard{grid-template-columns:1fr}.acard .right{justify-content:space-between}
  .vrow{grid-template-columns:1fr}
  .pubnav,    .authcard{padding:28px 22px}
  .demo-chip{display:none}
}

[hidden]{display:none!important}
/* assets */
.searchbox{position:relative;max-width:420px;margin-bottom:6px}
.searchbox input{padding-left:14px}
.alist{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);overflow:hidden}
.arow{display:flex;align-items:center;gap:16px;padding:18px 22px}
.arow+.arow{border-top:1px solid var(--line)}
.arow .body{min-width:0;flex:1}
.arow .body b{display:block;font-weight:600;line-height:1.35}
.arow .note{font-size:13.5px;color:var(--muted);margin:1px 0 0}
.arow .dom{display:block;font-size:12.5px;color:var(--faint);margin-top:2px}
.arow .acts{display:flex;align-items:center;gap:8px;flex:none}
.iconbtn{background:none;border:1px solid var(--line-2);color:var(--muted);cursor:pointer;display:flex;padding:7px;border-radius:10px}
.iconbtn:hover{color:var(--bad);border-color:var(--bad);background:var(--bad-bg)}
@media (max-width:760px){.arow{flex-wrap:wrap;padding:16px}.arow .acts{width:100%}}
.metrics{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
select{width:100%;padding:12px 14px;border:1px solid var(--line-2);border-radius:var(--r-sm);background:#fff;color:var(--text);font:inherit;min-width:190px}
select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 4px rgba(248,68,30,.13)}
.toolbar{display:flex;gap:16px;align-items:flex-end;flex-wrap:wrap;padding:18px 20px;margin-bottom:18px}
.toolbar>div{min-width:0}
.table th.num,.table td.num{text-align:right;font-variant-numeric:tabular-nums}
.rank{display:inline-grid;place-items:center;width:28px;height:28px;border-radius:50%;background:var(--brand-soft);color:var(--brand-ink);font-weight:700;font-size:13px}
dialog{border:0;border-radius:var(--r);padding:0;box-shadow:var(--shadow-lg);width:min(460px,92vw);color:var(--text)}
dialog::backdrop{background:rgba(26,26,26,.45)}
.dlgbox{padding:26px}
@media (max-width:760px){.metrics{grid-template-columns:1fr}.toolbar .btn{margin-left:0!important}}
.lb{list-style:none;margin:0;padding:0}
.lb li{display:flex;align-items:center;gap:12px;padding:10px 10px;border-radius:12px}
.lb li+li{margin-top:2px}
.lb li.mine,.table tr.mine td{background:var(--brand-soft)}
.lb .nm{flex:1;min-width:0;font-weight:600;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.lb .lk{font-size:13px;color:var(--muted);white-space:nowrap}
.rank.top{background:var(--brand);color:#fff}
.stat-line{padding-bottom:10px}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

.glyph{font-weight:600;line-height:1}
.back .glyph{font-size:15px}

.loading{padding:60px 0;text-align:center;color:var(--muted)}
button[disabled]{opacity:.6;cursor:progress}

.usr-link{font-size:13px;font-weight:600;color:var(--muted);text-decoration:none}
.usr-link:hover{color:var(--ink)}
@media (max-width:760px){.usr-link{display:none}}
.cred{border-color:var(--brand);background:var(--brand-soft);margin-bottom:20px}
.credrow{display:flex;align-items:center;gap:12px;margin-top:8px;flex-wrap:wrap}
.credrow code{font:600 22px/1.2 ui-monospace,SFMono-Regular,Menlo,monospace;letter-spacing:.04em;background:#fff;border:1px solid var(--line-2);border-radius:10px;padding:10px 16px;user-select:all}

.forgot{text-align:right;margin:-8px 0 18px;font-size:13px}
.forgot a{color:var(--brand-ink);font-weight:600;text-decoration:none}.forgot a:hover{text-decoration:underline}