/* Layout: one centred working column (max 50rem). The four track colours of the school logo run as a ribbon and colour-code lessons. */
:root{
  --bg:#f2f4f6; --surface:#ffffff; --sunk:#e8ecf0; --line:#d5dbe2;
  --ink:#16213a; --muted:#59647a;
  --navy:#1f3a6d; --green:#1d6b3f; --crimson:#a3203a; --gold:#a97c22;
  --ok:#1d6b3f; --ok-bg:#e3f2e8; --bad:#a3203a; --bad-bg:#f9e4e8;
  --accent:var(--navy); --on-accent:#ffffff;
  --code-bg:#f6f8fb; --code-ink:#1b2540; --console-bg:#101828; --console-ink:#e6edf7;
  --display:"Reem Kufi","IBM Plex Sans Arabic",system-ui,sans-serif;
  --body:"IBM Plex Sans Arabic",system-ui,"Segoe UI",Tahoma,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
  --r:14px;
}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){
  --bg:#0e1525; --surface:#162038; --sunk:#1c2843; --line:#2b3a5a;
  --ink:#e8ecf4; --muted:#9ba7bf;
  --navy:#7fa3e6; --green:#5cc489; --crimson:#ef7d92; --gold:#e0b45a;
  --ok:#5cc489; --ok-bg:#16352a; --bad:#ef7d92; --bad-bg:#3a1c27;
  --accent:#7fa3e6; --on-accent:#0e1525;
  --code-bg:#0f1830; --code-ink:#dbe5f7; --console-bg:#070c18; --console-ink:#e6edf7; color-scheme:dark}}
:root[data-theme="dark"]{
  --bg:#0e1525; --surface:#162038; --sunk:#1c2843; --line:#2b3a5a;
  --ink:#e8ecf4; --muted:#9ba7bf;
  --navy:#7fa3e6; --green:#5cc489; --crimson:#ef7d92; --gold:#e0b45a;
  --ok:#5cc489; --ok-bg:#16352a; --bad:#ef7d92; --bad-bg:#3a1c27;
  --accent:#7fa3e6; --on-accent:#0e1525;
  --code-bg:#0f1830; --code-ink:#dbe5f7; --console-bg:#070c18; --console-ink:#e6edf7; color-scheme:dark}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{background:var(--bg);color:var(--ink);font-family:var(--body);font-size:16px;line-height:1.75;margin:0}
[hidden]{display:none!important}
.wrap{max-width:50rem;margin:0 auto;padding-inline:16px;padding-block:calc(16px + env(safe-area-inset-top,0px)) 40px;display:flex;flex-direction:column;gap:16px}
main,.view{display:flex;flex-direction:column;gap:16px;min-width:0}
h1,h2,h3{font-family:var(--display);line-height:1.35;margin:0;text-wrap:balance;font-weight:700}
.h2{font-size:1.2rem}
p{margin:0}
button{font:inherit;color:inherit}
.lt{font-family:var(--mono);font-size:.92em;unicode-bidi:isolate;direction:ltr}
.stack{display:flex;flex-direction:column;gap:12px;min-width:0}
.row{display:flex;flex-wrap:wrap;gap:8px 12px;align-items:center;justify-content:space-between}
.ribbon{display:flex;height:5px;border-radius:3px;overflow:hidden}
.ribbon i{flex:1}
.ribbon i:nth-child(1){background:var(--green)}.ribbon i:nth-child(2){background:var(--navy)}
.ribbon i:nth-child(3){background:var(--crimson)}.ribbon i:nth-child(4){background:var(--gold)}

.head{display:flex;gap:14px;align-items:center}
.logo{width:76px;height:76px;border-radius:50%;flex:none;background:#fff;box-shadow:0 0 0 1px var(--line)}
.logo2{width:76px;height:76px;border-radius:12px;flex:none;background:#fff;box-shadow:0 0 0 1px var(--line);margin-inline-start:auto;object-fit:contain}
.head .t{min-width:0;display:flex;flex-direction:column;gap:2px}
.head .school,.head .sub{font-size:.82rem;color:var(--muted);font-weight:600}
.head h1{font-size:clamp(1.35rem,4.6vw,1.9rem)}

.tabs{display:flex;gap:6px;overflow-x:auto;scrollbar-width:none;position:sticky;top:env(safe-area-inset-top,0px);z-index:5;background:var(--bg);padding-block:6px}
.tabs::-webkit-scrollbar{display:none}
.tabs button{flex:none;border:1.5px solid var(--line);background:var(--surface);border-radius:999px;padding:7px 15px;font-weight:600;font-size:.92rem;cursor:pointer;white-space:nowrap}
.tabs button[aria-current=page]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:18px}
.label{font-size:.8rem;font-weight:700;color:var(--muted);letter-spacing:.02em}
.note{font-size:.86rem;color:var(--muted)}
.field{display:flex;flex-direction:column;gap:6px}
input[type=text],input[type=search],input[type=number],select{font:inherit;width:100%;padding:11px 13px;border:1.5px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink)}
input:focus-visible,button:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent);outline-offset:2px}

.tiles{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
@media (max-width:34rem){.tiles{grid-template-columns:1fr}}
.tile{all:unset;box-sizing:border-box;cursor:pointer;display:flex;flex-direction:column;gap:6px;padding:16px;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);transition:border-color .15s,transform .15s}
.tile:hover{border-color:var(--accent);transform:translateY(-1px)}
.tile:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent)}
.tile .mt{font-family:var(--display);font-weight:700;font-size:1.15rem}
.tile .md{font-size:.88rem;color:var(--muted);line-height:1.6}
.tag{align-self:flex-start;font-size:.72rem;font-weight:700;padding:1px 8px;border-radius:6px;color:var(--on-accent)}
.t-crimson{background:var(--crimson)}.t-green{background:var(--green)}.t-navy{background:var(--navy)}.t-gold{background:var(--gold)}

.tbl{overflow-x:auto}
table{width:100%;border-collapse:collapse;font-size:.9rem;font-variant-numeric:tabular-nums}
th,td{padding:7px 9px;text-align:start;border-bottom:1px solid var(--line);vertical-align:top}
th{font-size:.78rem;color:var(--muted);font-weight:700}
th.c,td.c,td.n{text-align:center}
td.n{font-weight:700;white-space:nowrap}
tfoot td{border-bottom:0;font-weight:700}
.dot{display:inline-block;width:9px;height:9px;border-radius:50%;margin-inline-end:6px;vertical-align:middle;flex:none}

.mast{display:flex;flex-direction:column;gap:10px}
.mrow{display:grid;grid-template-columns:minmax(0,1fr) 5rem;gap:4px 12px;align-items:center;font-size:.88rem}
.bar{grid-column:1/-1;height:6px;border-radius:3px;background:var(--sunk);overflow:hidden}
.bar span{display:block;height:100%;border-radius:3px}
.mrow .num{text-align:end;font-variant-numeric:tabular-nums;color:var(--muted)}

/* filters */
.filters{display:flex;flex-direction:column;gap:14px}
.fgroup{display:flex;flex-direction:column;gap:6px}
.unit{font-size:.82rem;font-weight:700;color:var(--muted);margin-top:4px}
.checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr));gap:6px}
.check{display:flex;gap:10px;align-items:flex-start;padding:8px 11px;border:1.5px solid var(--line);border-radius:10px;cursor:pointer;font-size:.92rem;line-height:1.55}
.check input{margin-top:4px;accent-color:var(--accent);width:17px;height:17px;flex:none}
.check small{display:block;color:var(--muted);font-size:.76rem}
.seg{display:flex;flex-wrap:wrap;gap:6px}
.seg button{border:1.5px solid var(--line);background:var(--surface);border-radius:999px;padding:5px 13px;cursor:pointer;font-size:.88rem;font-weight:600}
.seg button[aria-pressed=true]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.range{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.range input{width:6.5rem;text-align:center}
.link{all:unset;cursor:pointer;color:var(--accent);font-weight:600;font-size:.85rem}
.link:focus-visible{outline:2px solid var(--accent)}
.count{font-size:.86rem;color:var(--muted);font-weight:600}

.btns{display:flex;flex-wrap:wrap;gap:10px}
.btn{border:0;border-radius:10px;padding:11px 18px;font-weight:700;cursor:pointer;background:var(--accent);color:var(--on-accent);font-size:.98rem}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn.wide{flex:1 1 12rem}
.btn.sm{padding:7px 12px;font-size:.88rem}
.err{color:var(--bad);font-size:.88rem;font-weight:600}

/* quiz runner */
.qbar{position:sticky;top:calc(env(safe-area-inset-top,0px) + 50px);z-index:4;background:var(--bg);padding-block:6px;display:flex;flex-direction:column;gap:8px}
.qstats{display:flex;justify-content:space-between;gap:10px;font-size:.88rem;font-weight:600;color:var(--muted);font-variant-numeric:tabular-nums}
.qstats b{color:var(--ink)}
.prog{height:6px;background:var(--sunk);border-radius:3px;overflow:hidden}
.prog span{display:block;height:100%;width:0;background:var(--accent);transition:width .25s}
.section{font-family:var(--display);font-size:1.02rem;color:var(--accent)}
.qmeta{display:flex;flex-wrap:wrap;gap:6px 12px;font-size:.8rem;color:var(--muted);font-weight:600;align-items:center}
.pg{all:unset;cursor:pointer;font-size:.8rem;font-weight:700;color:var(--accent);border-bottom:1px dashed currentColor}
.pg:focus-visible{outline:2px solid var(--accent)}
.qtext{font-size:1.15rem;font-weight:600;line-height:1.8}
.code{margin:0;background:var(--code-bg);color:var(--code-ink);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-family:var(--mono);font-size:.9rem;line-height:1.6;overflow-x:auto;white-space:pre;text-align:left}
.code .blank{background:color-mix(in srgb,var(--gold) 30%,transparent);border-radius:4px;padding:0 4px}
.answers{display:flex;flex-direction:column;gap:10px}
.answers.tf{flex-direction:row}
.ans{all:unset;box-sizing:border-box;cursor:pointer;flex:1;display:flex;gap:12px;align-items:center;padding:12px 15px;border:1.5px solid var(--line);border-radius:12px;background:var(--surface);font-weight:500;line-height:1.6;min-width:0}
.ans:hover{border-color:var(--accent)}
.ans:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 45%,transparent)}
.ans .k{flex:none;width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:var(--sunk);font-weight:700;font-size:.9rem}
.ans .v{white-space:pre-line;min-width:0;overflow-wrap:anywhere}
.ans.sel{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.ans.sel .k{background:var(--accent);color:var(--on-accent)}
.ans.ok{border-color:var(--ok);background:var(--ok-bg)}
.ans.ok .k{background:var(--ok);color:var(--surface)}
.ans.bad{border-color:var(--bad);background:var(--bad-bg)}
.ans.bad .k{background:var(--bad);color:var(--surface)}
.ans[aria-disabled=true]{cursor:default}
.answers.tf .ans{justify-content:center;font-size:1.1rem;font-weight:700}
.fill{display:flex;gap:8px;flex-wrap:wrap}
.fill input{flex:1 1 12rem}
.fb{border-radius:12px;padding:11px 15px;font-size:.95rem;line-height:1.7;border:1.5px solid}
.fb.ok{background:var(--ok-bg);border-color:var(--ok)}
.fb.bad{background:var(--bad-bg);border-color:var(--bad)}
.fb b{display:block}
.qnav{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}

.score{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.ring{--p:0;width:112px;height:112px;border-radius:50%;flex:none;display:grid;place-items:center;background:conic-gradient(var(--c,var(--accent)) calc(var(--p)*1%),var(--sunk) 0)}
.ring div{width:90px;height:90px;border-radius:50%;background:var(--surface);display:grid;place-items:center;text-align:center;line-height:1.15}
.ring strong{font-size:1.6rem;font-family:var(--display);font-variant-numeric:tabular-nums}
.ring small{font-size:.75rem;color:var(--muted)}
.score .t{display:flex;flex-direction:column;gap:4px;min-width:0}
.grade{font-family:var(--display);font-size:1.45rem}
.facts{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.9rem;color:var(--muted);font-variant-numeric:tabular-nums}
.facts b{color:var(--ink)}
.review,.bank{display:flex;flex-direction:column;gap:10px}
.rv{border:1px solid var(--line);border-radius:12px;padding:13px 15px;display:flex;flex-direction:column;gap:6px;border-inline-start:4px solid var(--ok);background:var(--surface);min-width:0}
.rv.bad{border-inline-start-color:var(--bad)}
.rv.part{border-inline-start-color:var(--gold)}
.rv .q{font-weight:600}
.rv .a{font-size:.9rem}
.rv .y{color:var(--bad);font-weight:600}
.rv .c{color:var(--ok);font-weight:600}
.rv .e{font-size:.86rem;color:var(--muted)}
.rv .m{font-size:.76rem;color:var(--muted);font-weight:600;display:flex;flex-wrap:wrap;gap:4px 12px;align-items:center}

/* practical */
.chip{font-size:.78rem;font-weight:700;padding:2px 10px;border-radius:999px;background:var(--sunk);color:var(--muted)}
.chip.strong{background:var(--accent);color:var(--on-accent)}
.task-text{white-space:pre-line;line-height:1.85}
.editor{font-family:var(--mono);font-size:.92rem;line-height:1.6;width:100%;padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;background:var(--code-bg);color:var(--code-ink);resize:vertical;tab-size:4;text-align:left;white-space:pre;overflow-x:auto}
.editor.small{min-height:4.5rem}
.console{margin:0;background:var(--console-bg);color:var(--console-ink);border-radius:10px;padding:12px 14px;font-family:var(--mono);font-size:.88rem;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere;text-align:left;max-height:22rem;overflow:auto}
.console .err{color:#ff9aa8;font-weight:500}
.console .in{color:#9fd3ff}
.tests{display:flex;flex-direction:column;gap:6px;font-size:.88rem}
.tests .t{border:1px solid var(--line);border-radius:10px;padding:8px 12px;display:flex;flex-direction:column;gap:2px}
.tests .t.ok{border-color:var(--ok);background:var(--ok-bg)}
.tests .t.bad{border-color:var(--bad);background:var(--bad-bg)}
.weeks{display:flex;flex-direction:column;gap:12px}
.wk{display:flex;flex-direction:column;gap:10px}
.wk h3{font-size:1.02rem}
.sk{display:flex;flex-direction:column;gap:6px}
.sk .sn{font-size:.86rem;font-weight:700;color:var(--muted);display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.tasklist{display:flex;flex-wrap:wrap;gap:6px}
.tasklist button{border:1.5px solid var(--line);background:var(--surface);border-radius:10px;padding:6px 12px;cursor:pointer;font-size:.88rem;font-weight:600}
.tasklist button.done{border-color:var(--ok);color:var(--ok)}
.pills{display:flex;gap:6px;overflow-x:auto;scrollbar-width:thin;padding-bottom:2px}
.pills button{flex:none;border:1.5px solid var(--line);background:var(--surface);border-radius:999px;padding:4px 12px;font-size:.82rem;font-weight:700;cursor:pointer;font-variant-numeric:tabular-nums}
.pills button[aria-current=step]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.pills button.has{border-color:var(--ok)}

/* book */
.wrapr{justify-content:flex-start}
#bkToc{flex:1 1 14rem;width:auto}
.pnum{display:flex;gap:6px;align-items:center;font-size:.88rem;font-weight:600;color:var(--muted)}
.pnum input{width:4.6rem;text-align:center;padding:7px}
.pagebox{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:auto;display:flex;justify-content:center;padding:8px;min-height:60vh}
.pagebox img{display:block;background:#fff;width:100%;max-width:none;height:auto}
.pagebox.zoom img{width:170%}

.foot{text-align:center;font-size:.8rem;color:var(--muted);display:flex;flex-direction:column;gap:4px;padding-top:8px}
@media (max-width:30rem){.logo2{width:58px;height:58px}.answers.tf{flex-direction:column}.logo{width:62px;height:62px}.ring{width:96px;height:96px}.ring div{width:76px;height:76px}.card{padding:15px}}
@media (prefers-reduced-motion:reduce){*{transition:none!important}}

/* book dock: fixed at the bottom while reading */
.wrap:has(#v-book:not([hidden])){padding-bottom:100px}
#bkBox{scroll-margin-top:64px}
.pagebox{touch-action:pan-y pinch-zoom;user-select:none;-webkit-user-select:none}
.dock{position:fixed;inset-inline:0;bottom:0;z-index:10;display:flex;align-items:center;justify-content:space-between;gap:10px;
  padding:10px max(16px,calc((100vw - 50rem)/2 + 16px));padding-bottom:calc(10px + env(safe-area-inset-bottom,0px));
  background:color-mix(in srgb,var(--surface) 92%,transparent);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);border-top:1px solid var(--line);box-shadow:0 -4px 16px rgb(0 0 0 / .08)}
.dbtn{border:0;border-radius:12px;background:var(--accent);color:var(--on-accent);font-weight:700;font-size:1rem;padding:12px 18px;min-width:7.5rem;cursor:pointer}
.dbtn:disabled{opacity:.4;cursor:default}
.dock .pnum input{width:4.2rem}
@media (max-width:30rem){.dbtn{min-width:0;padding:12px 14px}.dock .pnum span:first-child{display:none}}

.hints{display:flex;flex-direction:column;gap:8px}
.hint{border:1.5px dashed var(--gold);background:color-mix(in srgb,var(--gold) 10%,var(--surface));border-radius:12px;padding:10px 14px;display:flex;flex-direction:column;gap:6px}
.hint b{font-size:.85rem;color:var(--gold)}
.hint p{white-space:pre-line;line-height:1.8}
.hint .code{margin-top:2px}

.steps{margin:0;background:var(--code-bg);border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-family:var(--body);font-size:.95rem;line-height:1.9;white-space:pre-line;overflow-wrap:anywhere;text-align:start}

.home-link{align-self:flex-start;font-size:.85rem;font-weight:700;color:var(--accent);text-decoration:none;margin-bottom:-6px}
.home-link:hover{text-decoration:underline}