/* Zero & One — "sticker notebook" theme.
   Squared-notebook paper, chunky pressable pieces with a hard edge, and two characters: Zero (round, yellow) and One (tall, blue).
   Rule of thumb: anything you can press has depth (hard shadow); anything you only read is flat. */
@font-face{font-family:Baloo;font-weight:500;font-display:swap;src:url(../fonts/baloo-arabic-500.woff2) format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+060C,U+061B,U+061F}
@font-face{font-family:Baloo;font-weight:700;font-display:swap;src:url(../fonts/baloo-arabic-700.woff2) format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+060C,U+061B,U+061F}
@font-face{font-family:Baloo;font-weight:800;font-display:swap;src:url(../fonts/baloo-arabic-800.woff2) format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+060C,U+061B,U+061F}
@font-face{font-family:Baloo;font-weight:500;font-display:swap;src:url(../fonts/baloo-latin-500.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Baloo;font-weight:700;font-display:swap;src:url(../fonts/baloo-latin-700.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Baloo;font-weight:800;font-display:swap;src:url(../fonts/baloo-latin-800.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
/* Plex is the reading face: lesson notes, questions, answers */
@font-face{font-family:Plex;font-weight:400;font-display:swap;src:url(../fonts/plex-arabic-400.woff2) format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+060C,U+061B,U+061F}
@font-face{font-family:Plex;font-weight:600;font-display:swap;src:url(../fonts/plex-arabic-600.woff2) format("woff2");unicode-range:U+0600-06FF,U+0750-077F,U+FB50-FDFF,U+FE70-FEFF,U+200C-200F,U+060C,U+061B,U+061F}
@font-face{font-family:Plex;font-weight:400;font-display:swap;src:url(../fonts/plex-latin-400.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}
@font-face{font-family:Plex;font-weight:600;font-display:swap;src:url(../fonts/plex-latin-600.woff2) format("woff2");unicode-range:U+0000-00FF,U+0131,U+0152-0153,U+02BB-02BC,U+02C6,U+02DA,U+02DC,U+2000-206F,U+2074,U+20AC,U+2122,U+2191,U+2193,U+2212,U+2215,U+FEFF,U+FFFD}

:root{
  --bg:#f1f4ff; --grid:rgba(47,91,255,.07); --card:#ffffff; --ink:#14142b; --ink2:#5d6180; --line:#d9deef; --edge:#14142b;
  --blue:#2f5bff; --yellow:#ffc83d; --coral:#ff5a4f; --green:#12a765; --mk:#14142b;
  --brand:var(--blue); --on-brand:#fff; --brand-soft:#e3e9ff; --hl:#ffe27a;
  --good:var(--green); --good-soft:#d8f5e6; --bad:#e23b30; --bad-soft:#ffe1de; --warn:#8a5a00; --warn-soft:#fff0c2;
  --r:18px; --r-s:14px; --drop:0 4px 0 var(--edge);
  --ui:Baloo,Plex,"Segoe UI",Tahoma,system-ui,sans-serif; --read:Plex,"Segoe UI",Tahoma,system-ui,sans-serif;
  --safe-t:env(safe-area-inset-top,0px); --safe-b:env(safe-area-inset-bottom,0px);
}
body.dark{
  --bg:#10111f; --grid:rgba(255,255,255,.035); --card:#1b1d33; --ink:#f0f2ff; --ink2:#a3a8c9; --line:#30345a; --edge:#05060d;
  --blue:#5b7dff; --brand-soft:#252c57; --hl:rgba(255,200,61,.34);
  --good-soft:#12382a; --bad:#ff7b72; --bad-soft:#44201f; --warn:#f2c14e; --warn-soft:#3a2e0e;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0;color:var(--ink);font-family:var(--ui);font-weight:500;font-size:16px;line-height:1.6}
body{min-height:100vh;min-height:100dvh;-webkit-font-smoothing:antialiased;background-color:var(--bg);
  background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:24px 24px}
#app{max-width:640px;margin:0 auto;padding:calc(var(--safe-t) + 14px) 16px calc(96px + var(--safe-b))}
#app.enter{animation:enter .22s ease-out}
@keyframes enter{from{opacity:0;transform:translateY(8px)}}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--yellow);outline-offset:2px}
h1,h2,h3{margin:0;line-height:1.3;font-weight:800}
.ltr{direction:ltr;text-align:left;unicode-bidi:isolate}
.muted{color:var(--ink2)}
.sp{height:12px}.sp2{height:20px}
.svgi{width:1.25em;height:1.25em;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;flex:none;vertical-align:-.24em}

/* the two characters */
.duo{display:block;overflow:visible;flex:none;height:auto}
.duo .body{stroke:var(--mk);stroke-width:5;stroke-linejoin:round}
.duo .y{fill:var(--yellow)}.duo .b{fill:#2f5bff}
.duo .hole{fill:var(--card);stroke:var(--mk);stroke-width:5}
.duo .eye{fill:var(--mk)}
.duo .ln{fill:none;stroke:var(--mk);stroke-width:3.6;stroke-linecap:round}
.duo .zero,.duo .one{transform-box:fill-box;transform-origin:50% 100%}
.duo .zero{animation:bob 2.6s ease-in-out infinite}
.duo .one{animation:bob 2.6s ease-in-out -1.3s infinite}
.duo.happy .zero,.duo.happy .one{animation:hop .5s ease-out 2}
.duo.happy .one{animation-delay:.12s}
.duo.sad .zero,.duo.sad .one{animation:none;transform:translateY(3px) rotate(-3deg)}
.duo.sad .one{transform:translateY(3px) rotate(3deg)}
.duo.wow .zero,.duo.wow .one{animation:wig .6s ease-in-out 2}
@keyframes bob{50%{transform:translateY(-4px)}}
@keyframes hop{40%{transform:translateY(-14px) scale(1.04,.96)}70%{transform:translateY(0) scale(.97,1.03)}}
@keyframes wig{25%{transform:rotate(-5deg)}75%{transform:rotate(5deg)}}

/* tab bar */
#tabbar{position:fixed;inset-inline:0;bottom:0;z-index:20;display:flex;justify-content:space-around;gap:4px;max-width:640px;margin:0 auto;background:var(--card);border-top:2px solid var(--edge);padding:8px 8px calc(8px + var(--safe-b))}
#tabbar button{flex:1;display:flex;flex-direction:column;align-items:center;gap:1px;padding:6px 2px;border-radius:14px;font-size:12px;font-weight:700;color:var(--ink2);transition:background .15s,color .15s}
#tabbar button .svgi{width:24px;height:24px;transition:transform .2s cubic-bezier(.3,1.6,.5,1)}
#tabbar button.on{color:var(--mk);background:var(--yellow)}
#tabbar button.on .svgi{transform:translateY(-2px) scale(1.12);stroke-width:2.4}
body.hide-tabs #tabbar{display:none}
body.hide-tabs #app{padding-bottom:calc(34px + var(--safe-b))}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:14px}
.top h1{font-size:24px}
.back{width:44px;height:44px;border-radius:var(--r-s);background:var(--card);border:2px solid var(--edge);box-shadow:0 3px 0 var(--edge);font-size:18px;display:grid;place-items:center;flex:none;transition:transform .08s,box-shadow .08s}
.back:active{transform:translateY(3px);box-shadow:0 0 0 var(--edge)}
.chip{display:inline-flex;align-items:center;gap:5px;padding:4px 12px;border-radius:999px;background:var(--card);border:2px solid var(--edge);font-weight:800;font-size:14px;font-variant-numeric:tabular-nums}
.chip.fire{background:var(--coral);color:#fff}
.chip.fire .svgi{animation:flick 1.6s ease-in-out infinite;transform-origin:50% 90%}
@keyframes flick{50%{transform:scale(1.14) rotate(-4deg)}}
.chips{display:flex;gap:8px;flex-wrap:wrap}

/* buttons: chunky, they sink when pressed */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:11px 20px;border-radius:var(--r-s);font-weight:800;font-size:16.5px;background:var(--blue);color:#fff;border:2px solid var(--edge);box-shadow:var(--drop);transition:transform .08s,box-shadow .08s;margin-bottom:4px}
.btn:active{transform:translateY(4px);box-shadow:0 0 0 var(--edge)}
.btn.block{display:flex;width:100%}
.btn.big{padding:14px 20px;font-size:18.5px}
.btn.light{background:var(--yellow);color:var(--mk)}
.btn.ghost{background:var(--card);color:var(--ink)}
.btn.good{background:var(--green);color:#fff}
.btn.small{padding:6px 13px;font-size:14px;box-shadow:0 3px 0 var(--edge)}
.btn.small:active{transform:translateY(3px)}
.btn[disabled]{opacity:.45;pointer-events:none}
a.btn{text-decoration:none}

/* hero: the characters talk, today's goal, the week */
.hero{background:var(--card);border:2px solid var(--edge);border-radius:22px;box-shadow:var(--drop);padding:16px;margin-bottom:6px}
.hero h2{font-size:21px}
.hero p{margin:6px 0 0;font-size:14.5px;color:var(--ink2)}
.stage{display:flex;align-items:flex-end;gap:12px;margin-bottom:14px}
.bubble{position:relative;flex:1;background:var(--brand-soft);border:2px solid var(--edge);border-radius:16px;padding:10px 14px;font-weight:700;font-size:15.5px;line-height:1.5;margin-bottom:26px}
.bubble::after{content:"";position:absolute;bottom:-9px;inset-inline-start:18px;width:14px;height:14px;background:var(--brand-soft);border:2px solid var(--edge);border-top:0;border-inline-end:0;transform:rotate(-45deg)}
[dir=rtl] .bubble::after{transform:rotate(45deg)}
.goalrow{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.ring{--p:0;width:84px;height:84px;border-radius:50%;flex:none;display:grid;place-items:center;border:2px solid var(--edge);background:conic-gradient(var(--green) calc(var(--p)*1%),var(--line) 0);animation:pop .4s cubic-bezier(.3,1.5,.5,1)}
.ring>div{width:60px;height:60px;border-radius:50%;background:var(--card);border:2px solid var(--edge);display:grid;place-content:center;text-align:center;line-height:1}
.ring b{font-size:20px;font-weight:800;font-variant-numeric:tabular-nums}
.ring small{font-size:11px;color:var(--ink2)}
.ring.full{background:var(--green)}
.week{flex:1;min-width:0}
.week .wl{font-weight:800;font-size:15px}
.week .ws{font-size:13px;color:var(--ink2);margin-bottom:8px}
.wk{display:flex;gap:5px;justify-content:space-between}
.wk span{flex:1;max-width:34px;aspect-ratio:1;border-radius:50%;border:2px solid var(--line);display:grid;place-items:center;font-size:12px;font-weight:800;color:var(--ink2)}
.wk span.on{background:var(--yellow);border-color:var(--edge);color:var(--mk)}
.wk span.now{border-color:var(--edge);border-style:dashed}
.wk span.on.now{border-style:solid;animation:pop .45s cubic-bezier(.3,1.6,.5,1)}
.next-l{text-align:center;font-size:13.5px;color:var(--ink2);margin-top:6px}
.dots{display:flex;flex-wrap:wrap;gap:5px}
.dots i{width:13px;height:13px;border-radius:50%;border:2px solid var(--line)}
.dots i.mid{background:var(--line)}
.dots i.on{background:var(--green);border-color:var(--edge)}

/* cards */
.card{background:var(--card);border-radius:var(--r);padding:16px;border:2px solid var(--edge);margin-bottom:14px}
.card h3{font-size:18px;margin-bottom:6px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:14px}
.mini{background:var(--card);border-radius:var(--r);padding:14px;border:2px solid var(--edge);box-shadow:var(--drop);text-align:start;display:block;width:100%;transition:transform .08s,box-shadow .08s;margin-bottom:4px}
.mini:active{transform:translateY(4px);box-shadow:0 0 0 var(--edge)}
.mini .ic{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;border:2px solid var(--edge);background:var(--yellow);color:var(--mk);font-size:19px}
.grid2 .mini:first-child .ic{background:var(--blue);color:#fff}
.grid2 .mini:last-child .ic{background:var(--coral);color:#fff}
.mini b{display:block;font-size:16.5px;font-weight:800;margin-top:8px}
.mini span{font-size:13px;color:var(--ink2);line-height:1.45;display:block}
.sectitle{display:flex;justify-content:space-between;align-items:baseline;margin:22px 2px 10px}
.sectitle h2{font-size:20px}

/* units */
.unit{background:var(--card);border-radius:var(--r);border:2px solid var(--edge);margin-bottom:10px;overflow:hidden}
.unit>button{width:100%;display:flex;align-items:center;gap:12px;padding:12px 14px;text-align:start}
.uicon{width:44px;height:44px;border-radius:14px;border:2px solid var(--edge);display:grid;place-items:center;font-size:20px;font-weight:800;flex:none;font-variant-numeric:tabular-nums;color:var(--mk);background:var(--yellow)}
.uicon.c1{background:var(--blue);color:#fff}.uicon.c2{background:var(--coral);color:#fff}.uicon.c3{background:var(--green);color:#fff}
.unit .t{flex:1;min-width:0}
.unit .t b{display:block;font-size:16px;line-height:1.35;font-weight:700}
.unit .t small{color:var(--ink2);font-size:12.5px;font-family:var(--read)}
.bar{height:10px;border-radius:99px;background:var(--line);overflow:hidden;margin-top:8px}
.bar i{display:block;height:100%;border-radius:99px;background:var(--green);transition:width .5s cubic-bezier(.3,1.3,.5,1)}
.lessons{display:none;border-top:2px solid var(--line);padding:6px 8px 10px}
.unit.open .lessons{display:block;animation:enter .2s ease-out}
.unit .arrow{transition:transform .2s;color:var(--ink2);font-size:20px}
.unit.open .arrow{transform:rotate(90deg)}
.lesson{width:100%;display:flex;align-items:center;gap:10px;padding:10px 8px;border-radius:var(--r-s);text-align:start;transition:background .12s}
.lesson:active{background:var(--brand-soft)}
.lesson .n{min-width:40px;padding:2px 0;border-radius:9px;background:var(--brand-soft);color:var(--blue);font-weight:800;font-size:13.5px;flex:none;font-variant-numeric:tabular-nums;direction:ltr;text-align:center}
.lesson .lt{flex:1;min-width:0}
.lesson .lt b{display:block;font-size:15px;line-height:1.4;font-weight:700}
.lesson .lt small{color:var(--ink2);font-size:12.5px;display:block}
.badge{font-size:12.5px;font-weight:800;padding:2px 10px;border-radius:99px;flex:none;font-variant-numeric:tabular-nums}
.badge.done{background:var(--good-soft);color:var(--good)}
.badge.mid{background:var(--warn-soft);color:var(--warn)}
.badge.new{color:var(--ink2);border:2px solid var(--line)}

/* tabs inside a lesson */
.seg{display:flex;gap:4px;background:var(--card);border:2px solid var(--edge);border-radius:16px;padding:4px;margin-bottom:16px}
.seg button{flex:1;padding:7px 4px;border-radius:11px;font-weight:800;font-size:14.5px;color:var(--ink2);transition:background .15s,color .15s}
.seg button.on{background:var(--blue);color:#fff}
.togrow .seg{margin:0;padding:3px}
.togrow .seg button{padding:5px 14px}

/* notes: reading face, key phrases get the highlighter */
.note,.goal,.model{font-family:var(--read);font-weight:400}
.goal{border-inline-start:4px solid var(--yellow);padding:4px 14px;margin-bottom:16px;font-size:14.5px}
.goal b{font-family:var(--ui);font-weight:800}
.goal ul{margin:4px 0 0;padding-inline-start:20px}
.note h3{font-family:var(--ui);font-size:18px;margin-bottom:8px}
.note p{margin:0 0 8px}
.note ul{margin:0;padding-inline-start:20px}
.note li{margin-bottom:6px}
.note code{background:var(--bg);border:1px solid var(--line);padding:0 6px;border-radius:6px;direction:ltr;unicode-bidi:isolate;font-size:.92em}
strong{font-weight:700;color:var(--ink)}
.note strong{background:linear-gradient(transparent 55%,var(--hl) 55%);font-weight:600}

/* terms */
.term{display:flex;gap:10px;align-items:stretch;margin-bottom:8px}
.term button{flex:1;text-align:start;background:var(--card);border-radius:var(--r-s);border:2px solid var(--edge);padding:12px 14px;display:flex;justify-content:space-between;align-items:center;gap:10px}
.term button>span:first-child{flex:1;min-width:0}
.term .en{font-weight:800;font-size:16.5px;direction:ltr;text-align:right;unicode-bidi:isolate}
.term .ar{display:none;color:var(--ink2);font-size:14.5px;margin-top:4px;font-family:var(--read);font-weight:400}
.term.show .ar{display:block;animation:enter .2s ease-out}
.term .tg{color:var(--ink2);flex:none;display:grid}
.term.show .tg{color:var(--blue)}
.fcard{min-height:230px;display:flex;flex-direction:column;justify-content:center;box-shadow:var(--drop)}
.fcard.show{animation:flip .4s cubic-bezier(.3,1.3,.5,1);background:var(--brand-soft)}
@keyframes flip{from{transform:perspective(700px) rotateY(90deg)}}

/* quiz: answers are bubble-sheet rows you can press */
.qtop{display:flex;align-items:center;gap:12px;margin-bottom:16px}
.qtop .bar{flex:1;margin:0;height:14px;border:2px solid var(--edge);background:var(--card)}
.qcount{font-weight:800;font-size:14.5px;color:var(--ink2);min-width:46px;text-align:center;font-variant-numeric:tabular-nums}
.timer{font-weight:800;font-variant-numeric:tabular-nums;color:var(--coral)}
.qcard{margin-bottom:14px}
.qlabel{font-size:13px;color:var(--ink2);margin-bottom:6px;font-weight:700}
.qtext{font-family:var(--read);font-size:19.5px;font-weight:600;line-height:1.5;direction:ltr;text-align:left;unicode-bidi:isolate}
.opts{display:flex;flex-direction:column;gap:11px;margin-top:18px}
.opt{width:100%;display:flex;align-items:center;gap:12px;padding:12px 14px;border-radius:var(--r-s);border:2px solid var(--edge);box-shadow:var(--drop);background:var(--card);text-align:left;direction:ltr;font-family:var(--read);font-size:16.5px;font-weight:600;transition:transform .08s,box-shadow .08s}
.opt:active{transform:translateY(4px);box-shadow:0 0 0 var(--edge)}
.opt .k{width:30px;height:30px;border-radius:50%;border:2px solid var(--edge);display:grid;place-items:center;font-family:var(--ui);font-weight:800;font-size:14px;flex:none}
.opt.sel{background:var(--brand-soft)}
.opt.sel .k{background:var(--blue);color:#fff}
.opt.right{background:var(--good-soft);animation:pop .4s cubic-bezier(.3,1.6,.5,1)}
.opt.right .k{background:var(--green);color:#fff}
.opt.wrong{background:var(--bad-soft);animation:shake .36s}
.opt.wrong .k{background:var(--bad);color:#fff}
.opt[disabled]{pointer-events:none;box-shadow:0 2px 0 var(--edge)}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
@keyframes pop{0%{transform:scale(.94)}60%{transform:scale(1.03)}}
.fb{display:flex;align-items:center;gap:12px;border-radius:var(--r);padding:12px 14px;margin-bottom:14px;font-size:15px;border:2px solid var(--edge);animation:enter .25s ease-out;font-family:var(--read);font-weight:400}
.fb>div{flex:1;min-width:0}
.fb.ok{background:var(--good-soft)}
.fb.no{background:var(--bad-soft)}
.fb b.h{display:block;margin-bottom:2px;font-size:17px;font-family:var(--ui);font-weight:800}
.stickybtn{position:sticky;bottom:calc(10px + var(--safe-b));z-index:5}

/* result */
.result{text-align:center}
.result .duo{margin:0 auto 4px}
.result .score{font-size:64px;font-weight:800;line-height:1.05;font-variant-numeric:tabular-nums;direction:ltr}
.lvup{display:inline-block;background:var(--yellow);color:var(--mk);border:2px solid var(--edge);border-radius:99px;padding:3px 16px;font-weight:800;margin:8px 0 2px;animation:pop .6s cubic-bezier(.3,1.8,.5,1) .3s both}
.statrow{display:grid;grid-template-columns:repeat(3,1fr);gap:0;margin:14px 0;border:2px solid var(--edge);border-radius:var(--r-s);overflow:hidden}
.stat{padding:10px 4px;background:var(--card)}
.stat+.stat{border-inline-start:2px solid var(--edge)}
.stat b{display:block;font-size:21px;font-weight:800;font-variant-numeric:tabular-nums}
.stat span{font-size:12.5px;color:var(--ink2)}
.rv{border-top:2px solid var(--line);padding:10px 0;text-align:start;font-family:var(--read);font-weight:400}
.rv .q{font-weight:600;direction:ltr;text-align:left;unicode-bidi:isolate;font-size:15px}
.rv .a{font-size:13.5px;margin-top:2px}
.rv .a.g{color:var(--good)}.rv .a.b{color:var(--bad)}
/* celebration: it rains zeros and ones */
.bin{position:fixed;top:-40px;z-index:60;pointer-events:none;font-family:var(--ui);font-weight:800;animation:fall 2.3s cubic-bezier(.4,.1,.7,1) forwards}
@keyframes fall{to{transform:translateY(112vh) rotate(var(--rot,200deg))}}

/* forms */
.field{display:block;margin-bottom:12px}
.field span{display:block;font-weight:700;font-size:14.5px;margin-bottom:4px}
.field input[type=text],.field input[type=number],.field input[type=date],.field select{width:100%;padding:11px 12px;border-radius:var(--r-s);border:2px solid var(--edge);background:var(--card);color:var(--ink);font:inherit}
.check{display:flex;align-items:center;gap:10px;padding:8px;border-radius:var(--r-s)}
.check input{width:20px;height:20px;accent-color:var(--blue)}
.check small{color:var(--ink2)}
.togrow{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 0;border-bottom:2px solid var(--line)}
.togrow:last-child{border:0}
.sw{width:52px;height:30px;border-radius:99px;background:var(--line);border:2px solid var(--edge);position:relative;transition:background .2s;flex:none}
.sw::after{content:"";position:absolute;top:2px;inset-inline-start:2px;width:22px;height:22px;border-radius:50%;background:#fff;border:2px solid var(--edge);transition:inset-inline-start .2s cubic-bezier(.3,1.5,.5,1);box-sizing:border-box}
.sw.on{background:var(--green)}
.sw.on::after{inset-inline-start:24px}
.empty{text-align:center;padding:26px 10px;color:var(--ink2)}
.badges{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.bdg{text-align:center;border:2px solid var(--edge);background:var(--yellow);color:var(--mk);border-radius:var(--r-s);padding:10px 4px;font-size:12.5px;font-weight:800}
.bdg .svgi{display:block;margin:0 auto 4px;width:26px;height:26px}
.bdg.lock{background:transparent;color:var(--ink2);border-color:var(--line);border-style:dashed}
.bdg.lock .svgi{color:var(--line)}
.unitstat{display:flex;align-items:center;gap:10px;margin-bottom:10px;font-size:14px}
.unitstat .nm{width:110px;flex:none;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.unitstat .bar{flex:1;margin:0}
.unitstat .pc{width:42px;text-align:end;font-weight:800;font-variant-numeric:tabular-nums}
.linkbox{direction:ltr;text-align:left;background:var(--bg);border:2px solid var(--line);border-radius:var(--r-s);padding:10px 12px;font-size:13px;word-break:break-all;font-family:var(--read)}

#toast{position:fixed;inset-inline:16px;bottom:calc(98px + var(--safe-b));margin:0 auto;max-width:420px;background:var(--mk);color:#fff;border:2px solid #000;border-radius:var(--r-s);padding:11px 16px;text-align:center;font-weight:700;font-size:15px;opacity:0;transform:translateY(14px) scale(.96);transition:opacity .2s,transform .25s cubic-bezier(.3,1.5,.5,1);pointer-events:none;z-index:50}
#toast.on{opacity:1;transform:none}
.modal{position:fixed;inset:0;z-index:100;background:rgba(20,20,43,.6);display:grid;place-items:center;padding:20px}
.modal .box{background:var(--card);border:2px solid var(--edge);box-shadow:0 6px 0 var(--edge);border-radius:var(--r);padding:20px;max-width:380px;width:100%;animation:pop .3s cubic-bezier(.3,1.5,.5,1)}
.modal .box p{margin:0 0 14px;font-weight:700}
.modal textarea{width:100%;border:2px solid var(--edge);border-radius:var(--r-s);padding:10px;background:var(--bg);color:var(--ink);font:inherit;margin-bottom:12px}
.modal .acts{display:flex;gap:10px;justify-content:flex-end}

/* unit summary, printable paper, class mode */
.sumt{width:100%;border-collapse:collapse;font-size:14px;margin-top:8px;font-family:var(--read);font-weight:400}
.sumt td{padding:6px 4px;border-top:2px solid var(--line);vertical-align:top}
.sumt td:first-child{width:38%}
.pq{margin:0 0 14px;break-inside:avoid;font-family:var(--read);font-weight:400}
.bigq #app{max-width:1100px}
.bigq .qtext{font-size:30px}
.bigq .opt{font-size:22px}

/* code questions + written essay answers */
pre.code{direction:ltr;text-align:left;unicode-bidi:isolate;margin:12px 0 0;padding:12px;background:var(--mk);color:#e9ecff;border:2px solid var(--edge);border-radius:var(--r-s);overflow-x:auto;font:14px/1.6 ui-monospace,Consolas,"Courier New",monospace;white-space:pre}
pre.code .s{color:#8fe3b4}
pre.code .t,pre.code .k{color:#ffd66b;font-weight:600}
pre.code .n{color:#ff9d95}
.bigq pre.code{font-size:22px}
textarea.ans{display:block;width:100%;margin:10px 0;padding:10px 12px;border:2px solid var(--edge);border-radius:var(--r-s);background:var(--card);color:var(--ink);font:400 16px/1.6 var(--read);resize:vertical}
.model{border-inline-start:4px solid var(--yellow);padding:2px 12px;margin:10px 0}
.rate{display:flex;gap:8px;flex-wrap:wrap}
.rate .btn.on{background:var(--blue);color:#fff}

@media (min-width:700px){#app{padding-top:30px}}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{
  #tabbar,#toast,.noprint{display:none!important}
  body{background:#fff}
  .card{border:0;break-inside:avoid}
  .card.pbreak{break-before:page}
}

/* English interface (لغات): the page runs left-to-right */
[dir=ltr] .term .en{text-align:left}
[dir=ltr] .back .svgi,[dir=ltr] .unit .arrow{transform:scaleX(-1)}
[dir=ltr] .unit.open .arrow{transform:rotate(90deg)}
[dir=ltr] .lt small.ltr,[dir=ltr] .unit .t small.ltr,[dir=ltr] .top .muted.ltr{display:none}

/* owner dashboard: one series, so one colour; thin bars on a shared baseline */
.bars{display:flex;align-items:stretch;gap:2px;height:150px;margin-top:10px}
.bcol{flex:1;min-width:0;display:flex;flex-direction:column;align-items:center}
.bcol em{height:18px;font-style:normal;font-size:12px;font-weight:800;font-variant-numeric:tabular-nums}
.btrack{flex:1;width:100%;display:flex;align-items:flex-end;justify-content:center;border-bottom:2px solid var(--line)}
.btrack i{display:block;width:100%;max-width:16px;min-height:2px;background:var(--blue);border-radius:4px 4px 0 0}
.bcol:hover .btrack i{background:var(--ink)}
.bcol small{font-size:10.5px;color:var(--ink2);font-variant-numeric:tabular-nums;margin-top:3px}

/* owner notice on the home screen, report link under an answer, five dashboard tabs */
.notice{background:var(--yellow);color:var(--mk);box-shadow:var(--drop)}
.notice p{margin:0 0 10px;font-weight:700;white-space:pre-wrap}
.replink{display:block;margin-top:8px;padding:0;font-size:12.5px;color:var(--ink2);text-decoration:underline;font-family:var(--ui)}
.seg.five button{font-size:13px;padding:7px 1px}

/* dashboard profile form + video link under a weak lesson */
.pf details{margin:4px 0 12px}
.pf summary{font-weight:800;cursor:pointer;padding:6px 0}
.vlink{margin:-2px 0 12px;font-size:13.5px;color:var(--blue)}
/* owner credit under the app name on the home screen */
.byline{display:block;padding:0;font-size:13.5px;font-weight:700;color:var(--ink2);text-decoration:underline;font-family:var(--ui)}
/* pinch zoom is allowed; this only stops double-tap zoom on fast taps */
html{touch-action:manipulation}
/* the owner's photo */
.face{border-radius:50%;object-fit:cover;border:2px solid var(--edge);background:var(--card);flex:none}
.face.sm{width:26px;height:26px;border-width:1.5px}
.face.ic{width:42px;height:42px}
.face.lg{width:64px;height:64px}
.byline{display:inline-flex;align-items:center;gap:6px;margin-top:4px}
.who{display:flex;align-items:center;gap:12px;margin-bottom:10px}
/* 3-lives game */
.lives{display:flex;gap:3px;color:var(--bad)}
.lives .svgi{width:20px;height:20px;fill:currentColor}
.lives .off{opacity:.25}
/* ministry-style exam: sticky bar with the countdown */
.mxbar{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;gap:10px;background:var(--card);border:2px solid var(--edge);border-radius:var(--r-s);box-shadow:var(--drop);padding:10px 14px;margin:0 0 14px}
.mxbar span{display:block;font-size:13px}
.mxbar .timer{font-size:22px}
.mxbar .timer.low{animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.4}}
@media (prefers-reduced-motion:reduce){.mxbar .timer.low{animation:none}}
/* splash when the app is opened from the home screen (display-mode for Android/iOS 16+, .standalone class for older iOS) */
#splash{display:none}
@media (display-mode:standalone){#splash{display:grid}}
html.standalone #splash{display:grid}
#splash{position:fixed;inset:0;z-index:200;place-content:center;justify-items:center;gap:22px;background:#2f5bff;color:#fff;animation:splashOut .35s ease-in 1.5s forwards}
#splash .duo{width:190px;animation:splashPop .45s ease-out both}
#splash .duo .b{fill:#fff} /* One is blue: on the blue splash it is drawn white */
#splash .duo.happy .zero,#splash .duo.happy .one{animation-iteration-count:3;animation-delay:.35s}
#splash .duo.happy .one{animation-delay:.47s}
#splash b{animation:splashPop .45s ease-out .15s both}
#splash b{font-family:var(--ui);font-size:30px;font-weight:800;letter-spacing:.5px}
@keyframes splashOut{to{opacity:0;visibility:hidden}}
@keyframes splashPop{from{transform:scale(.7);opacity:0}}
@media (prefers-reduced-motion:reduce){#splash .duo,#splash .duo *,#splash b{animation:none!important}#splash{animation-duration:.01s}}
.steps{margin:0 0 14px;padding:0;list-style:none;display:grid;gap:10px;font-weight:600}
.steps li{display:flex;align-items:center;gap:10px}
.steps .n{flex:none;width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--yellow);color:var(--mk);border:2px solid var(--edge);font-weight:800}
.steps .svgi{width:22px;height:22px;flex:none}