:root{--p:#1d4ed8;--p2:#0f766e;--bg:#f5f7fb;--line:#e3e8f0;--ok:#15803d;--bad:#b91c1c}
*{box-sizing:border-box}body{margin:0;font-family:Vazirmatn,Tahoma,sans-serif;background:var(--bg);color:#1f2937;line-height:1.9}
.katex{direction:ltr;unicode-bidi:isolate;font-size:1.08em}
a{color:var(--p);text-decoration:none}.wrap{max-width:1150px;margin:auto;padding:0 16px}
.top{background:#0b1f4d;color:#fff}.top .wrap{display:flex;gap:18px;align-items:center;flex-wrap:wrap;padding:10px 16px}
.top a{color:#dbe6ff}.brand{font-weight:800;font-size:1.25em;color:#fff!important}.brand small{font-weight:400;opacity:.7;font-size:.6em}
nav{display:flex;gap:14px;flex:1;flex-wrap:wrap}.me{font-size:.9em}.badge{background:#fbbf24;color:#000;border-radius:9px;padding:0 7px;font-size:.8em}
.inline{display:inline}.link{background:none;border:0;color:#dbe6ff;cursor:pointer;font:inherit}
main{padding:18px 16px 60px}.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:14px 18px;margin:12px 0;box-shadow:0 1px 2px #0001}
.btn{background:var(--p);color:#fff;border:0;border-radius:8px;padding:7px 16px;font:inherit;cursor:pointer;display:inline-block}.btn.alt{background:var(--p2)}.btn.danger{background:var(--bad)}.btn.big{padding:11px 26px;font-size:1.1em}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.hero{background:linear-gradient(135deg,#1d4ed8,#0f766e);color:#fff;border-radius:16px;padding:34px;margin-top:8px}.hero h1{margin:0 0 6px}.hero .btn{background:#fff;color:#1d4ed8}.hero .btn.alt{background:#fbbf24;color:#000}
.stats{display:flex;gap:16px;margin:16px 0}.stats div{background:#ffffff22;border-radius:10px;padding:8px 18px}.stats b{font-size:1.6em;display:block}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(330px,1fr));gap:0 16px}.li{border-bottom:1px dashed var(--line);padding:4px 0}.muted{color:#6b7280}
.filters{display:flex;flex-wrap:wrap;gap:10px;align-items:end}.filters label{display:flex;flex-direction:column;font-size:.85em;color:#4b5563}.filters .wide{min-width:320px}
select,input,textarea{font:inherit;border:1px solid #cbd5e1;border-radius:7px;padding:4px 8px;background:#fff}textarea{width:100%}input[type=number]{width:70px}
.q .qtext{font-size:1.05em;margin:6px 0}.qimg{max-width:320px;display:block;margin:8px 0;border:1px solid var(--line);border-radius:8px}.qimg.sm{max-width:200px}
.opts{display:grid;grid-template-columns:repeat(4,1fr);gap:4px 18px;padding-right:22px}.opts li.right{color:var(--ok);font-weight:700}.opts li.wrong{color:var(--bad);text-decoration:line-through}
.meta{display:flex;flex-wrap:wrap;gap:6px}.tag{background:#eef2ff;border-radius:6px;padding:0 8px;font-size:.78em}.tag.src{background:#e0f2fe}.tag.d1{background:#dcfce7}.tag.d3{background:#fee2e2}.tag.priv{background:#fde68a}
.tag.topic{background:#f1f5f9;border:1px solid #cbd5e1}.tag.topic.low{border-color:#f59e0b;background:#fffbeb}.tag.topic.ok{border-color:#16a34a}
details summary{cursor:pointer;color:var(--p)}.sol{background:#f8fafc;border-right:3px solid var(--p2);padding:6px 12px;margin-top:6px}
.quizbar{background:#ecfeff}.timer{position:sticky;top:0;z-index:5;background:#0b1f4d;color:#fff;font-size:1.1em}.timer.warn{background:var(--bad)}
.choices{display:grid;grid-template-columns:1fr 1fr;gap:6px}.choice{border:1px solid var(--line);border-radius:8px;padding:6px 10px;cursor:pointer}.choice:has(input:checked){background:#dbeafe;border-color:var(--p)}.choice.clear{color:#6b7280;font-size:.85em}
.cn{display:inline-block;width:22px;height:22px;border-radius:50%;background:#e5e7eb;text-align:center;line-height:22px;font-size:.8em}
.num{font-weight:700;color:#374151}.ok{color:var(--ok)}.bad{color:var(--bad)}.st-ok{border-right:5px solid var(--ok)}.st-bad{border-right:5px solid var(--bad)}.st-blank{border-right:5px solid #9ca3af}
.scores{text-align:center}.pct{font-size:3em;font-weight:800}.pct.good{color:var(--ok)}.pct.mid{color:#d97706}.pct.low{color:var(--bad)}
.tbl{width:100%;border-collapse:collapse}.tbl td,.tbl th{border-bottom:1px solid var(--line);padding:5px;text-align:right}.bar{display:inline-block;width:120px;height:9px;background:#e5e7eb;border-radius:5px;margin-left:6px;vertical-align:middle}.bar i{display:block;height:100%;background:var(--p2);border-radius:5px}
.pickable{display:flex;gap:12px;cursor:pointer}.pickable:has(input:checked){border-color:var(--p);background:#f0f6ff}.pickable input{transform:scale(1.4);margin-top:8px}
.opts.inline{font-size:.92em}.sticky{position:sticky;top:0;z-index:5;display:flex;gap:14px;flex-wrap:wrap;align-items:center;background:#fffbeb}
.review{display:grid;grid-template-columns:1.3fr 1fr;gap:16px}.conf{font-weight:800;color:hsl(calc(var(--c)*120),70%,35%)}
.tree ul{margin:0}.tree code,.review code{font-size:.75em;color:#64748b}.narrow{max-width:420px;margin:30px auto}
.msg{padding:8px 14px;border-radius:8px;background:#e0f2fe;margin:8px 0}.msg.error{background:#fee2e2}.msg.success{background:#dcfce7}
@media(max-width:700px){.opts,.choices{grid-template-columns:1fr 1fr}.review{grid-template-columns:1fr}}
.qcrop,.scrop{display:block;max-width:100%;height:auto;margin:.4rem 0;background:#fff;border:1px solid #e5e7eb;border-radius:6px}
.scrop{border-color:#bbf7d0}