:root{--pb:#1382cf;--pd:#0e6bb0;--bg:#f4f8fc;--bd:#d9e4ee;--ok:#1b8a4b;--okb:#e6f6ec;--no:#c8372d;--nob:#fdeceb;--tx:#1d2733}
.qpage{max-width:1500px;margin:0 auto;padding:18px 24px 40px;color:var(--tx)}
.qpage h1{font-size:1.7rem;line-height:1.25;margin:6px 0 10px}
.qpage .crumbs{font-size:.9rem;color:#566}
.qpage .intro{max-width:1000px;line-height:1.6}
.stats{display:flex;gap:12px;flex-wrap:wrap;margin:14px 0}
.stats div{background:#eef6fc;border-radius:10px;padding:10px 18px;font-size:.9rem}
.stats b{display:block;font-size:1.35rem;color:var(--pd)}
.qgrid{display:grid;grid-template-columns:300px minmax(0,1fr);gap:26px;align-items:start;margin-top:18px}
.qside{position:sticky;top:12px;background:#fff;border:1px solid var(--bd);border-radius:12px;padding:16px;max-height:calc(100vh - 24px);overflow:auto}
.qside h2{font-size:1rem;margin:0 0 8px}
.qside select{width:100%;padding:9px;border:1px solid var(--bd);border-radius:8px;font-size:.95rem;margin-bottom:12px;background:#fff}
.prog{height:8px;background:#e5edf5;border-radius:6px;overflow:hidden;margin:6px 0 4px}
.prog i{display:block;height:100%;width:0;background:var(--pb);transition:width .3s}
.sumline{font-size:.88rem;color:#456;display:flex;justify-content:space-between;gap:8px;flex-wrap:wrap}
.pal{display:grid;grid-template-columns:repeat(6,1fr);gap:7px;margin:14px 0}
.pal button{border:1px solid var(--bd);background:#fff;border-radius:8px;padding:8px 0;font-weight:700;cursor:pointer;font-size:.9rem;color:var(--tx)}
.pal button.ans{background:#e0effb;border-color:var(--pb);color:var(--pd)}
.pal button.ok{background:var(--okb);border-color:var(--ok);color:var(--ok)}
.pal button.no{background:var(--nob);border-color:var(--no);color:var(--no)}
.btnrow{display:flex;gap:8px;flex-wrap:wrap}
.btn{border:1px solid var(--pb);background:#fff;color:var(--pd);border-radius:8px;padding:8px 14px;font-weight:700;cursor:pointer;text-decoration:none;font-size:.9rem}
.btn.pri{background:var(--pb);color:#fff}
.legend{font-size:.78rem;color:#567;margin-top:10px;line-height:1.7}
.qlist .topic{font-size:1.15rem;margin:30px 0 6px;padding-bottom:5px;border-bottom:2px solid var(--pb);color:var(--pd)}
.q{border:1px solid var(--bd);border-radius:12px;padding:18px 22px;margin:16px 0;background:#fff;scroll-margin-top:16px;box-shadow:0 1px 2px rgba(20,60,100,.04)}
.q .qhead{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-bottom:10px;font-size:.85rem;color:#566}
.q .qn{font-weight:800;color:#fff;background:var(--pb);border-radius:6px;padding:3px 10px;font-size:.95rem}
.q .qtype{background:#eef2f6;border-radius:5px;padding:2px 8px}
.q .qtext{line-height:1.7;font-size:1.04rem}
.q .qtext .figwrap{text-align:center;margin:12px 0}
.q .qimg,.q .optimg{max-width:100%;height:auto}
.q .figwrap .qimg{max-width:min(100%,460px)}
.q .optimg{max-height:170px}
.q .blank{display:inline-block;width:70px;border-bottom:1px solid #333;margin:0 3px}
.q table.mt{border-collapse:collapse;margin:8px 0}.q table.mt td{padding:3px 14px 3px 0;vertical-align:top}
ol.opts{list-style:none;padding:0;margin:14px 0 0;display:grid;grid-template-columns:1fr 1fr;gap:10px 16px}
ol.opts.long{grid-template-columns:1fr}
ol.opts li{display:flex;gap:12px;align-items:center;padding:10px 14px;border:1.5px solid var(--bd);border-radius:10px;cursor:pointer;background:#fff;transition:background .15s,border-color .15s;min-height:46px}
ol.opts li:hover{border-color:var(--pb);background:#f3f9fe}
ol.opts li .bd{flex:none;width:30px;height:30px;border-radius:50%;border:1.5px solid #9fb6ca;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;color:#456}
ol.opts li.sel{border-color:var(--pb);background:#e6f2fc}
ol.opts li.sel .bd{background:var(--pb);border-color:var(--pb);color:#fff}
ol.opts li.right{border-color:var(--ok);background:var(--okb)}ol.opts li.right .bd{background:var(--ok);border-color:var(--ok);color:#fff}
ol.opts li.wrong{border-color:var(--no);background:var(--nob)}ol.opts li.wrong .bd{background:var(--no);border-color:var(--no);color:#fff}
ol.opts.done li{cursor:default}
.numin{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
.numin input{flex:1;min-width:160px;max-width:260px;padding:11px 12px;border:1.5px solid var(--bd);border-radius:10px;font-size:1rem}
.fb{margin-top:10px;font-weight:700;font-size:.95rem;min-height:1px}
.fb.ok{color:var(--ok)}.fb.no{color:var(--no)}
.sol{margin-top:14px;border:1px solid var(--bd);border-radius:10px;background:var(--bg);overflow:hidden}
.solbtn{all:unset;box-sizing:border-box;width:100%;cursor:pointer;padding:12px 16px;font-weight:700;color:var(--pd);display:flex;justify-content:space-between;align-items:center}
.solbtn:hover{background:#e9f3fb}.solbtn:focus-visible{outline:2px solid var(--pb)}
.solbtn .ch{font-style:normal;transition:transform .35s}
.sol.open .solbtn .ch{transform:rotate(180deg)}
.solwrap{display:grid;grid-template-rows:0fr;transition:grid-template-rows .45s ease}
.sol.open .solwrap{grid-template-rows:1fr}
.solin{overflow:hidden;min-height:0}
.solbody{padding:0 16px;border-top:1px solid transparent;opacity:0;transform:translateY(-8px);transition:opacity .4s .1s,transform .4s .1s,padding .3s;line-height:1.7}
.sol.open .solbody{padding:12px 16px 16px;border-top-color:var(--bd);opacity:1;transform:none}
.solbody .soon{color:#667;font-style:italic}
.solbody .ansline{display:inline-block;background:var(--okb);color:var(--ok);border-radius:6px;padding:3px 10px;margin-bottom:6px}
.solbody .warn{background:#fff7e0;border:1px solid #f0d58a;border-radius:8px;padding:6px 10px;font-size:.88rem;margin-top:8px}
.solbody .note{font-size:.8rem;color:#789;margin-top:10px}
@keyframes pop{0%{transform:scale(1)}40%{transform:scale(1.035)}100%{transform:scale(1)}}
@keyframes shake{0%,100%{transform:translateX(0)}20%{transform:translateX(-7px)}40%{transform:translateX(7px)}60%{transform:translateX(-5px)}80%{transform:translateX(4px)}}
@keyframes glow{0%{box-shadow:0 0 0 0 rgba(27,138,75,.55)}100%{box-shadow:0 0 0 14px rgba(27,138,75,0)}}
@keyframes slidein{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}
@keyframes bounce{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.25)}100%{transform:scale(1);opacity:1}}
ol.opts li.sel{animation:pop .3s}
ol.opts li.right{animation:pop .45s,glow .9s}
ol.opts li.wrong{animation:shake .45s}
ol.opts li.right .bd,ol.opts li.wrong .bd{animation:bounce .45s}
.fb{animation:slidein .35s}
.pal button.ok,.pal button.no,.pal button.ans{animation:pop .35s}
.q.flash-ok{animation:glow .9s}
.confetti{position:fixed;width:9px;height:9px;border-radius:2px;pointer-events:none;z-index:9999;opacity:0}
@media (prefers-reduced-motion:reduce){*{animation:none !important;transition:none !important}}
.chnav{display:flex;justify-content:space-between;gap:10px;margin:26px 0;flex-wrap:wrap}
.chnav a{font-weight:700}
.dl{display:inline-block;padding:10px 18px;border-radius:8px;font-weight:700;text-decoration:none;color:#fff !important;background:var(--pb) !important}
.topiclist{columns:2;max-width:900px}
.ctable{border-collapse:collapse;width:100%;max-width:1000px}.ctable th,.ctable td{border:1px solid var(--bd);padding:9px 12px;text-align:left}.ctable th{background:#eef6fc}
@media(max-width:900px){
 .qpage{padding:12px 12px 30px}.qpage h1{font-size:1.3rem}
 .qgrid{grid-template-columns:1fr;gap:0}
 .qside{position:sticky;top:0;z-index:20;max-height:none;padding:8px 10px;border-radius:0 0 12px 12px;margin:0 -12px;border-width:0 0 1px}
 .qside .full{display:none}
 .pal{display:flex;overflow-x:auto;gap:6px;margin:8px 0 2px;padding-bottom:4px}
 .pal button{flex:none;min-width:40px;padding:7px 0}
 .q{padding:14px 14px}
 ol.opts{grid-template-columns:1fr}
 .topiclist{columns:1}
}