/* Layout: sticky top bar with tabs + class filter; content in a single 1180px column of panels. */
:root{
  --bg:#f3f5f5; --surface:#ffffff; --surface-2:#f7f9f9; --line:#dde3e4; --line-2:#c9d2d4;
  --ink:#14232c; --ink-2:#4a5b64; --ink-3:#7b8a91;
  --brand:#123a4f; --brand-ink:#ffffff;
  --hw:#0e7468; --hw-soft:#e2f2ef; --exam:#3b4fa8; --exam-soft:#e7eaf8;
  --good:#1d7a46; --good-soft:#e3f3e9; --warn:#a86400; --warn-soft:#fbf0dc; --bad:#b4282e; --bad-soft:#fbe6e6;
  --focus:#2b7bd6;
  --f-display:"Readex Pro","IBM Plex Sans Arabic",Tahoma,sans-serif;
  --f-body:"IBM Plex Sans Arabic",Tahoma,"Segoe UI",sans-serif;
  --r:10px; --r-sm:7px;
  --shadow:0 1px 2px rgba(18,58,79,.06),0 4px 14px rgba(18,58,79,.05);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root{
    --bg:#0f171b; --surface:#16222a; --surface-2:#1b2932; --line:#26363f; --line-2:#334650;
    --ink:#e6edf0; --ink-2:#a9b8bf; --ink-3:#7d8f97;
    --brand:#1d5571; --brand-ink:#ffffff;
    --hw:#3cc0ad; --hw-soft:#163a37; --exam:#8d9cf0; --exam-soft:#262c4d;
    --good:#55c98a; --good-soft:#173527; --warn:#e3a344; --warn-soft:#3a2c14; --bad:#f07479; --bad-soft:#3d1f22;
    --shadow:0 1px 2px rgba(0,0,0,.3);
    color-scheme:dark;
  }
}
*{box-sizing:border-box}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font:15px/1.6 var(--f-body);-webkit-font-smoothing:antialiased}
button,input,select{font:inherit;color:inherit}
h1,h2,h3{font-family:var(--f-display);font-weight:600;line-height:1.3;margin:0;text-wrap:balance}
a{color:var(--exam)}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--focus);outline-offset:2px}
.num,.tnum{font-variant-numeric:tabular-nums}
.muted{color:var(--ink-3)}

/* ---------- top bar ---------- */
.topbar{position:sticky;top:0;z-index:20;background:var(--brand);color:var(--brand-ink);box-shadow:0 1px 0 rgba(0,0,0,.08)}
.topbar-inner,.filterbar-inner,.page{max-width:1180px;margin:0 auto;padding-left:max(16px,env(safe-area-inset-left,0px));padding-right:max(16px,env(safe-area-inset-right,0px))}
.topbar-inner{display:flex;align-items:center;gap:20px;padding-block:10px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.brand-mark{width:38px;height:38px;border-radius:9px;background:rgba(255,255,255,.14);display:grid;place-items:center;font:700 15px var(--f-display);letter-spacing:.02em;flex:none}
.brand-name{font:600 17px var(--f-display)}
.brand-sub{font-size:12px;opacity:.75;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.tabs{display:flex;gap:2px;margin-inline-start:auto;overflow-x:auto;scrollbar-width:none}
.tabs button{background:none;border:0;color:inherit;opacity:.72;padding:8px 14px;border-radius:8px;cursor:pointer;font-weight:500;white-space:nowrap}
.tabs button:hover{opacity:1;background:rgba(255,255,255,.08)}
.tabs button[aria-selected="true"]{opacity:1;background:rgba(255,255,255,.16);font-weight:600}
.top-actions{display:flex;gap:8px}
.topbar .btn-ghost{color:var(--brand-ink);border-color:rgba(255,255,255,.3)}
.topbar .btn-primary,.topbar .btn-primary:hover{background:#fff;color:var(--brand)}
.topbar .btn-primary[aria-current="page"]{box-shadow:0 0 0 2px rgba(255,255,255,.45)}
.filterbar{background:var(--surface);color:var(--ink);border-bottom:1px solid var(--line)}
.filterbar-inner{display:flex;align-items:center;gap:12px;padding-block:8px;overflow-x:auto}
.filter-label{font-size:12px;color:var(--ink-3);letter-spacing:.04em}
.chips{display:flex;gap:6px}
.chip{border:1px solid var(--line-2);background:var(--surface);border-radius:999px;padding:4px 14px;cursor:pointer;font-size:14px;white-space:nowrap}
.chip[aria-checked="true"]{background:var(--ink);color:var(--surface);border-color:var(--ink)}
.chip .count{opacity:.6;margin-inline-start:8px;font-size:12px;unicode-bidi:isolate}

/* ---------- page ---------- */
.page{padding-block:24px 64px}
.view{display:flex;flex-direction:column;gap:20px}
.view-head{display:flex;align-items:flex-end;justify-content:space-between;gap:12px;flex-wrap:wrap}
.view-head h1{font-size:24px}
.view-head p{margin:2px 0 0;color:var(--ink-2)}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow)}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:14px 18px;border-bottom:1px solid var(--line);flex-wrap:wrap}
.panel-head h2{font-size:16px}
.panel-body{padding:16px 18px}
.loading,.empty{padding:40px 16px;text-align:center;color:var(--ink-3)}
.empty h3{color:var(--ink);font-size:18px;margin-bottom:6px}

/* KPI row */
.kpis{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.kpi{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:14px 16px;box-shadow:var(--shadow)}
.kpi-label{font-size:12.5px;color:var(--ink-2)}
.kpi-value{font:600 28px/1.2 var(--f-display);font-variant-numeric:tabular-nums;margin-top:4px}
.kpi-sub{font-size:12.5px;color:var(--ink-3)}
.kpi.hw .kpi-value{color:var(--hw)} .kpi.exam .kpi-value{color:var(--exam)}

.grid-2{display:grid;grid-template-columns:minmax(0,1.4fr) minmax(0,1fr);gap:20px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:1px solid var(--line-2);background:var(--surface);border-radius:var(--r-sm);padding:7px 14px;cursor:pointer;font-weight:500;text-decoration:none;color:var(--ink);white-space:nowrap}
.btn:hover{background:var(--surface-2)}
.btn-primary{background:var(--brand);border-color:transparent;color:#fff}
.btn-primary:hover{filter:brightness(1.08);background:var(--brand)}
.btn-ghost{background:transparent}
.btn-danger{color:var(--bad);border-color:color-mix(in srgb,var(--bad) 40%,transparent)}
.btn-sm{padding:4px 10px;font-size:13px}
.btn-block{width:100%}
.btn[disabled]{opacity:.5;cursor:not-allowed}

/* segmented */
.seg{display:inline-flex;border:1px solid var(--line-2);border-radius:var(--r-sm);overflow:hidden}
.seg button{border:0;background:var(--surface);padding:6px 14px;cursor:pointer}
.seg button+button{border-inline-start:1px solid var(--line-2)}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--surface);font-weight:600}
.seg.kind button[data-kind="homework"][aria-pressed="true"]{background:var(--hw);color:#fff}
.seg.kind button[data-kind="exam"][aria-pressed="true"]{background:var(--exam);color:#fff}

/* pills */
.pill{display:inline-flex;align-items:center;gap:4px;padding:1px 9px;border-radius:999px;font-size:12px;font-weight:600;white-space:nowrap}
.pill.hw{background:var(--hw-soft);color:var(--hw)} .pill.exam{background:var(--exam-soft);color:var(--exam)}
.pill.good{background:var(--good-soft);color:var(--good)} .pill.warn{background:var(--warn-soft);color:var(--warn)} .pill.bad{background:var(--bad-soft);color:var(--bad)}
.pill.neutral{background:var(--surface-2);color:var(--ink-2);border:1px solid var(--line)}

/* progress */
.bar{height:8px;background:var(--surface-2);border:1px solid var(--line);border-radius:999px;overflow:hidden;min-width:60px}
.bar>i{display:block;height:100%;background:var(--hw);border-radius:999px}
.exam-ctx .bar>i{background:var(--exam)}

/* activity list */
.act-list{display:flex;flex-direction:column}
.act{display:grid;grid-template-columns:minmax(0,1fr) 190px 110px auto;gap:16px;align-items:center;padding:14px 18px;border-top:1px solid var(--line)}
.act:first-child{border-top:0}
.act-title{font-weight:600;font-size:15.5px}
.act-meta{font-size:12.5px;color:var(--ink-3);display:flex;gap:10px;flex-wrap:wrap}
.act-rate{display:flex;flex-direction:column;gap:4px;font-size:12.5px;color:var(--ink-2)}
.act-rate .row{display:flex;justify-content:space-between}
.act-avg{text-align:center}
.act-avg b{display:block;font:600 18px var(--f-display);font-variant-numeric:tabular-nums}
.act-avg span{font-size:12px;color:var(--ink-3)}
.act-actions{display:flex;gap:6px}
.act-detail{grid-column:1/-1;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--r-sm);padding:14px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.cls-box h4{margin:0 0 6px;font:600 14px var(--f-display);display:flex;justify-content:space-between}
.miss-list{margin:0;padding:0;list-style:none;font-size:13.5px;max-height:220px;overflow:auto}
.miss-list li{padding:3px 0;border-bottom:1px dashed var(--line);display:flex;justify-content:space-between;gap:8px}
.miss-list li:last-child{border-bottom:0}
.done-all{color:var(--good);font-size:13.5px}

/* tables */
.table-wrap{overflow:auto;max-height:70vh;border-top:1px solid var(--line)}
table.grid{border-collapse:separate;border-spacing:0;width:100%;font-size:13.5px}
.grid th,.grid td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:center;white-space:nowrap;font-variant-numeric:tabular-nums}
.grid thead th{position:sticky;top:0;background:var(--surface-2);z-index:2;font-weight:600;font-size:12.5px;color:var(--ink-2);vertical-align:bottom}
.grid thead th .th-max{display:block;font-weight:400;color:var(--ink-3)}
.grid .c-name{text-align:right;position:sticky;right:0;background:var(--surface);z-index:1;min-width:190px;font-weight:500}
.grid thead .c-name{z-index:3;background:var(--surface-2)}
.grid .c-idx{color:var(--ink-3);width:36px}
.grid tbody tr:hover td{background:var(--surface-2)}
.grid tbody tr:hover .c-name{background:var(--surface-2)}
.cell{cursor:pointer;border-radius:5px;padding:2px 6px;display:inline-block;min-width:34px}
.cell:hover{outline:1px solid var(--line-2)}
.cell.miss{color:var(--bad);background:var(--bad-soft);font-weight:600}
.cell.low{color:var(--warn)}
.cell.manual{text-decoration:underline dotted}
.c-sum{font-weight:600}
.th-act{max-width:120px;white-space:normal;line-height:1.35}

/* students */
.toolbar{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.search{flex:1;min-width:200px;border:1px solid var(--line-2);border-radius:var(--r-sm);padding:7px 12px;background:var(--surface)}
.watch-list{list-style:none;margin:0;padding:0}
.watch-list li{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 18px;border-top:1px solid var(--line);cursor:pointer}
.watch-list li:first-child{border-top:0}
.watch-list li:hover{background:var(--surface-2)}
.watch-list .who{min-width:0}
.watch-list .who b{display:block;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.watch-list .who span{font-size:12.5px;color:var(--ink-3)}

/* import */
.drop{border:2px dashed var(--line-2);border-radius:var(--r);padding:36px 16px;text-align:center;background:var(--surface);cursor:pointer;transition:background .15s,border-color .15s}
.drop.over{border-color:var(--hw);background:var(--hw-soft)}
.drop h2{font-size:19px;margin-bottom:4px}
.drop p{margin:0;color:var(--ink-2)}
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;font-size:13.5px;color:var(--ink-2)}
.steps div{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 14px}
.steps b{display:block;color:var(--ink);font-family:var(--f-display);font-weight:600;margin-bottom:2px}
.form-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.field{display:flex;flex-direction:column;gap:4px;min-width:0}
.field label{font-size:12.5px;color:var(--ink-2);font-weight:500}
.field input,.field select{border:1px solid var(--line-2);border-radius:var(--r-sm);padding:7px 10px;background:var(--surface);width:100%;min-width:0}
.field.wide{grid-column:span 2}
.hint{font-size:12.5px;color:var(--ink-3)}
.sum-row{display:flex;gap:10px;flex-wrap:wrap}
.notice{border-radius:var(--r-sm);padding:10px 14px;font-size:14px}
.notice.warn{background:var(--warn-soft);color:var(--warn)}
.notice.bad{background:var(--bad-soft);color:var(--bad)}
.notice.good{background:var(--good-soft);color:var(--good)}
.notice.info{background:var(--surface-2);color:var(--ink-2);border:1px solid var(--line)}
.preview-actions{display:flex;gap:8px;justify-content:flex-end;flex-wrap:wrap}
.um-table td,.um-table th{text-align:right}

/* drawer */
.drawer-backdrop{position:fixed;inset:0;background:rgba(10,20,26,.45);z-index:40}
.drawer{position:fixed;top:0;bottom:0;left:0;width:min(520px,100%);background:var(--surface);z-index:41;display:flex;flex-direction:column;box-shadow:0 0 40px rgba(0,0,0,.25);padding-top:env(safe-area-inset-top,0px);padding-bottom:env(safe-area-inset-bottom,0px)}
.drawer-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px;padding:16px 18px;border-bottom:1px solid var(--line)}
.drawer-head h2{font-size:19px}
.drawer-body{padding:16px 18px;overflow:auto;display:flex;flex-direction:column;gap:16px}
.mini-kpis{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.mini-kpis div{border:1px solid var(--line);border-radius:var(--r-sm);padding:8px 10px;background:var(--surface-2)}
.mini-kpis b{display:block;font:600 19px var(--f-display);font-variant-numeric:tabular-nums}
.mini-kpis span{font-size:12px;color:var(--ink-3)}
.hist{width:100%;border-collapse:collapse;font-size:13.5px}
.hist td{padding:7px 4px;border-bottom:1px solid var(--line)}
.hist td:last-child{text-align:left;white-space:nowrap}

/* toast */
.toast{position:fixed;bottom:calc(20px + env(safe-area-inset-bottom,0px));left:50%;transform:translateX(-50%);background:var(--ink);color:var(--surface);padding:10px 18px;border-radius:999px;z-index:60;font-size:14px;max-width:calc(100% - 32px)}
.toast.bad{background:var(--bad);color:#fff}

/* popover for editing a cell */
.pop{position:fixed;z-index:50;background:var(--surface);border:1px solid var(--line-2);border-radius:var(--r);box-shadow:0 10px 30px rgba(0,0,0,.18);padding:12px;width:240px;display:flex;flex-direction:column;gap:8px}
.pop h4{margin:0;font:600 14px var(--f-display)}
.pop .row{display:flex;gap:6px}

/* login */
.login-page{min-height:100vh;display:grid;place-items:center;padding:24px max(16px,env(safe-area-inset-left,0px))}
.login-card{width:min(380px,100%);background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:28px;box-shadow:var(--shadow);display:flex;flex-direction:column;gap:6px}
.login-card .brand-mark{background:var(--brand);color:#fff;margin-bottom:8px}
.login-card h1{font-size:22px}
.login-card form{display:flex;flex-direction:column;gap:8px;margin-top:14px}
.login-card label{font-size:13px;color:var(--ink-2)}
.login-card input{border:1px solid var(--line-2);border-radius:var(--r-sm);padding:9px 12px;background:var(--surface)}
.form-error{color:var(--bad);margin:0;font-size:14px}
.form-ok{color:var(--good);margin:0;font-size:14px}

@media (max-width:900px){
  .kpis{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-2{grid-template-columns:minmax(0,1fr)}
  .act{grid-template-columns:minmax(0,1fr) auto;row-gap:10px}
  .act-rate{grid-column:1/-1;order:3}
  .act-avg{order:2}
  .act-actions{grid-column:1/-1;order:4}
  .act-detail{grid-template-columns:minmax(0,1fr)}
  .form-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .steps{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .topbar-inner{gap:10px}
  .tabs{order:3;width:100%;margin:0}
  .top-actions{margin-inline-start:auto}
  .brand-sub{max-width:52vw}
  .form-grid{grid-template-columns:minmax(0,1fr)}
  .field.wide{grid-column:auto}
  .view-head h1{font-size:21px}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}