:root{
  --bg:#f6f7fb;--card:#fff;--ink:#1c2033;--muted:#6b7190;--line:#e3e6f0;
  --brand:#4a6fe8;--brand-d:#3a5bd0;--brand-l:#e8eeff;
  --ok:#12805c;--ok-l:#e3f6ee;--warn:#a86a00;--warn-l:#fff3dc;--bad:#c0322f;--bad-l:#fde8e7;
  --r:14px;
}
@media (prefers-color-scheme:dark){:root{
  --bg:#0e1320;--card:#161d2d;--ink:#eaeef6;--muted:#8a94aa;--line:#2b3549;
  --brand:#7c9eff;--brand-d:#9ab4ff;--brand-l:#1c2748;
  --ok:#4fd1a1;--ok-l:#123127;--warn:#f0b955;--warn-l:#352a10;--bad:#ff8a85;--bad-l:#3a1b1b;
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 Inter,'Noto Naskh Arabic',system-ui,sans-serif}
html[dir=rtl] body{font-family:'Noto Naskh Arabic',Inter,system-ui,sans-serif;font-size:17px}
.top{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;padding:14px 20px;max-width:900px;margin:0 auto}
.brand{display:flex;align-items:center;gap:8px;font-weight:700;font-size:1.15rem}
.logo{width:40px;height:40px;border-radius:11px;display:block}
.bt{display:flex;flex-direction:column;line-height:1.15}.bn{font-size:1.2rem}.by{display:flex;align-items:center;gap:4px;font:600 .68rem Inter,sans-serif;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.langs{display:flex;gap:4px;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:3px}
.langs button{border:0;background:none;color:var(--muted);padding:6px 14px;border-radius:999px;cursor:pointer;font:inherit;font-size:.9rem}
.langs button.on{background:var(--brand);color:#fff}
main{max-width:900px;margin:0 auto;padding:0 16px 40px}
.hero{text-align:center;padding:18px 0 22px}
.hero h1{font-size:clamp(1.5rem,4.5vw,2.2rem);line-height:1.25;margin:0 0 8px}
.hero p{margin:0;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:20px;margin-bottom:16px}
.card h2{display:flex;align-items:center;gap:10px;font-size:1.05rem;margin:0 0 14px}
.n{display:grid;place-items:center;width:26px;height:26px;border-radius:50%;background:var(--brand-l);color:var(--brand);font-size:.85rem;font-weight:700}
.muted{color:var(--muted);font-size:.9rem}
.drop{display:block;text-align:center;border:2px dashed var(--line);border-radius:var(--r);padding:28px 16px;cursor:pointer;transition:.15s}
.drop:hover,.drop.over,.drop:focus-visible{border-color:var(--brand);background:var(--brand-l);outline:none}
.drop-icon{font-size:2rem;color:var(--brand);line-height:1}
.files{list-style:none;margin:12px 0 0;padding:0;display:grid;gap:6px}
.files li{display:flex;align-items:center;gap:10px;background:var(--bg);border-radius:10px;padding:8px 12px}
.files li.bad{background:var(--bad-l)}
.fname{flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:500}
.files .x{border:0;background:none;color:var(--muted);font-size:1.3rem;line-height:1;cursor:pointer}
.paste{margin-top:14px}
.paste summary{cursor:pointer;color:var(--brand);font-weight:500}
textarea,input[type=text],select{width:100%;font:inherit;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:10px 12px}
textarea{resize:vertical;margin-top:8px}
textarea:focus,input:focus,select:focus{outline:2px solid var(--brand);outline-offset:-1px}
.types{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:10px}
.type{display:flex;justify-content:space-between;align-items:center;gap:8px;border:1px solid var(--line);border-radius:12px;padding:10px 12px;transition:.15s}
.type.on{border-color:var(--brand);background:var(--brand-l)}
.type-name{font-weight:500}
.stepper{display:flex;align-items:center;gap:4px}
.stepper button{width:30px;height:30px;border-radius:8px;border:1px solid var(--line);background:var(--card);color:var(--ink);font-size:1.1rem;cursor:pointer}
.stepper input{width:48px;text-align:center;border:1px solid var(--line);border-radius:8px;background:var(--card);color:var(--ink);font:inherit;padding:4px 0;-moz-appearance:textfield}
.stepper input::-webkit-outer-spin-button,.stepper input::-webkit-inner-spin-button{-webkit-appearance:none}
.total{margin-top:12px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px}
.grid label{display:grid;gap:4px;font-weight:500;font-size:.92rem}
button{font:inherit}
button.primary{background:var(--brand);color:#fff;border:0;border-radius:10px;padding:9px 18px;cursor:pointer;font-weight:600}
button.primary:hover{background:var(--brand-d)}
button.primary:disabled{opacity:.55;cursor:default}
button.big{width:100%;padding:15px;font-size:1.1rem;border-radius:12px}
.actions button:not(.primary),button.sm:not(.primary){background:var(--card);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:9px 16px;cursor:pointer}
button.sm{padding:7px 14px!important;font-size:.92rem}
.error{margin-top:12px;background:var(--bad-l);color:var(--bad);padding:12px 14px;border-radius:10px}
#loading{text-align:center;padding:90px 0}
.spinner{width:46px;height:46px;border:4px solid var(--brand-l);border-top-color:var(--brand);border-radius:50%;margin:0 auto 18px;animation:sp 1s linear infinite}
@keyframes sp{to{transform:rotate(360deg)}}
.quiz-head{display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap;align-items:flex-start;margin:10px 0 16px}
.quiz-head h1{margin:0;font-size:1.5rem;line-height:1.3}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.score{background:var(--brand-l);color:var(--brand);font-weight:700;padding:12px 16px;border-radius:12px;margin-bottom:14px;position:sticky;top:8px;z-index:2}
.qcard{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:18px;margin-bottom:14px}
.qhead{display:flex;align-items:center;gap:10px;margin-bottom:8px}
.num{display:grid;place-items:center;min-width:28px;height:28px;border-radius:50%;background:var(--ink);color:var(--bg);font-weight:700;font-size:.85rem}
.badge{font-size:.78rem;font-weight:600;padding:3px 10px;border-radius:999px;background:var(--brand-l);color:var(--brand)}
.b-prove{background:var(--warn-l);color:var(--warn)}.b-definition{background:var(--ok-l);color:var(--ok)}
.qtext{margin:4px 0 12px;font-size:1.05rem;white-space:pre-wrap}
.blank{display:inline-block;min-width:70px;border-bottom:2px solid var(--brand);color:var(--brand);text-align:center;margin:0 4px}
.opts{display:grid;gap:8px}
.opt{text-align:start;background:var(--bg);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:10px 14px;cursor:pointer}
.opt.sel{border-color:var(--brand);background:var(--brand-l)}
.opt.right{border-color:var(--ok);background:var(--ok-l);color:var(--ok)}
.opt.wrong{border-color:var(--bad);background:var(--bad-l);color:var(--bad)}
.qbar{display:flex;gap:8px;margin-top:12px}
.result{margin-top:12px;padding:10px 14px;border-radius:10px;background:var(--bg)}
.result.correct{background:var(--ok-l);color:var(--ok)}.result.partial{background:var(--warn-l);color:var(--warn)}.result.incorrect{background:var(--bad-l);color:var(--bad)}
.answer{margin-top:10px;padding:12px 14px;border-radius:10px;border:1px dashed var(--line)}
.pre{white-space:pre-wrap}.expl{margin-top:8px;color:var(--muted)}
footer{text-align:center;padding:10px 16px 30px}
@media print{
  body{background:#fff;color:#000}.top,footer,.actions,.qbar,.score,.result{display:none!important}
  .qcard{break-inside:avoid;border-color:#bbb}.answer{display:block!important}
  input,textarea{border:1px solid #aaa}
}