:root{--navy:#123b63;--blue:#1769aa;--sky:#eaf4fb;--ink:#172536;--muted:#657384;--line:#d9e3ec;--green:#16875b;--red:#c63d3d;--amber:#a86400;--white:#fff;--shadow:0 12px 35px rgba(18,59,99,.10)}
*{box-sizing:border-box}body{margin:0;background:#f3f7fa;color:var(--ink);font:16px/1.65 system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif}.topbar{height:64px;background:var(--navy);color:#fff;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,calc((100vw - 1120px)/2));position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:12px;font-weight:700}.brand-mark{width:34px;height:34px;display:grid;place-items:center;border:1px solid rgba(255,255,255,.5);border-radius:8px}main{max-width:1120px;margin:auto;padding:34px 24px 70px}.view{display:none}.view.active{display:block}.hero{background:linear-gradient(125deg,var(--navy),#1d6ba0);color:#fff;border-radius:22px;padding:42px 48px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow)}.eyebrow{margin:0 0 8px;letter-spacing:.12em;font-size:13px;font-weight:750;text-transform:uppercase;color:#8bc2e8}.hero h1{font-size:42px;line-height:1.2;margin:0 0 12px}.lead{margin:0;max-width:680px;color:#dcecf7}.hero-ring{width:140px;height:140px;border-radius:50%;border:12px solid rgba(255,255,255,.18);box-shadow:inset 0 0 0 2px rgba(255,255,255,.3);display:grid;place-content:center;text-align:center;flex:0 0 auto}.hero-ring strong{font-size:38px;line-height:1}.hero-ring span{font-size:14px}.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin:18px 0}.stats div{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;display:flex;align-items:baseline;justify-content:space-between}.stats strong{font-size:27px;color:var(--navy)}.stats span{font-size:14px;color:var(--muted)}.panel,.sources{background:#fff;border:1px solid var(--line);border-radius:18px;margin-top:18px;padding:25px 28px;box-shadow:0 5px 20px rgba(18,59,99,.04)}.panel-title{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.panel-title h2,.sources h2{margin:0;font-size:20px}.panel-title span{font-size:13px;color:var(--muted)}.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.mode-card{font:inherit;text-align:left;border:1px solid var(--line);border-radius:13px;background:#fff;padding:20px;cursor:pointer;color:var(--ink);transition:.16s}.mode-card:hover{border-color:var(--blue);transform:translateY(-2px);box-shadow:0 8px 22px rgba(23,105,170,.10)}.mode-card.primary{border-color:#8cbce0;background:var(--sky)}.mode-card b{display:block;font-size:17px;margin-bottom:6px}.mode-card span{color:var(--muted);font-size:13px}.filters{display:grid;grid-template-columns:1fr 1fr .8fr 1.6fr;gap:14px}.filters label{font-size:13px;color:var(--muted)}select,input{width:100%;display:block;margin-top:6px;border:1px solid var(--line);border-radius:9px;padding:10px 12px;background:#fff;font:inherit;color:var(--ink)}.sources ol{margin:12px 0 0;padding-left:25px;color:#415062}.quiz-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.quiz-head>div{display:flex;gap:16px;align-items:center}.quiz-head #modeTitle{font-weight:750;font-size:19px}.timer{color:var(--red);font-size:20px;font-weight:800;font-variant-numeric:tabular-nums}.progress{height:7px;background:#dbe5ed;border-radius:99px;overflow:hidden;margin-bottom:18px}.progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--blue),#53a9df);transition:width .2s}.question-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:30px 34px;box-shadow:var(--shadow);min-height:500px}.question-meta{display:flex;gap:8px;align-items:center;color:var(--muted);font-size:13px}.question-meta span{background:#f0f5f8;border-radius:99px;padding:3px 10px}.question-meta span:last-child{margin-left:auto;background:none}.question-card h2{font-size:22px;line-height:1.65;margin:22px 0}.options{display:grid;gap:12px}.option{display:flex;gap:13px;align-items:flex-start;border:1px solid var(--line);border-radius:12px;padding:14px 16px;cursor:pointer;background:#fff;transition:.12s}.option:hover{border-color:#8cbce0;background:#f8fbfd}.option.selected{border-color:var(--blue);background:#eaf4fb}.option.correct{border-color:var(--green);background:#eaf7f1}.option.wrong{border-color:var(--red);background:#fff0f0}.option-key{width:28px;height:28px;display:grid;place-items:center;border:1px solid #bccbd7;border-radius:7px;font-weight:750;flex:0 0 auto}.option input{display:none}.question-actions,.nav-row,.result-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:26px}.nav-row{justify-content:space-between}.ghost,.primary-btn{border:1px solid var(--line);border-radius:9px;padding:10px 18px;background:#fff;color:var(--ink);font:inherit;font-weight:650;cursor:pointer}.ghost:hover{background:#f2f6f9}.topbar .ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.35)}.small{padding:6px 12px;font-size:13px}.primary-btn{background:var(--blue);border-color:var(--blue);color:#fff}.primary-btn:hover{background:#11588f}.wide{width:100%;margin-top:20px}.answer-box{margin-top:22px;padding:18px 20px;border-left:4px solid var(--blue);background:#f4f8fb;border-radius:0 10px 10px 0}.answer-box .answer-title{font-weight:800;color:var(--navy)}.answer-box p{margin:6px 0}.answer-box .source{font-size:13px;color:var(--muted);border-top:1px solid var(--line);padding-top:9px;margin-top:10px}.hidden{display:none!important}.result-card{max-width:680px;margin:55px auto;background:#fff;border:1px solid var(--line);border-radius:22px;padding:46px;text-align:center;box-shadow:var(--shadow)}.score{display:flex;align-items:baseline;justify-content:center;color:var(--navy)}.score strong{font-size:82px;line-height:1}.score span{font-size:22px}.result-stats{display:flex;justify-content:center;gap:30px;margin:28px 0;color:var(--muted)}.result-stats b{color:var(--ink)}.result-actions{justify-content:center}dialog{border:0;border-radius:18px;padding:26px;width:min(720px,92vw);box-shadow:0 25px 80px rgba(0,0,0,.25)}dialog::backdrop{background:rgba(8,27,43,.58)}.dialog-head{display:flex;justify-content:space-between;align-items:center}.dialog-head h3{margin:0}.sheet-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:8px;max-height:55vh;overflow:auto;margin-top:20px}.sheet-item{border:1px solid var(--line);border-radius:7px;background:#fff;padding:7px 0;cursor:pointer}.sheet-item.answered{background:#eaf4fb;border-color:#8cbce0}.sheet-item.wrong{background:#fff0f0;border-color:#e7aaaa}
@media(max-width:760px){.topbar{padding:0 16px}.brand{font-size:14px}.topbar #homeBtn{display:none}main{padding:18px 13px 50px}.hero{padding:28px 24px;border-radius:16px}.hero h1{font-size:30px}.hero-ring{width:90px;height:90px;border-width:8px}.hero-ring strong{font-size:27px}.lead{font-size:14px}.stats{grid-template-columns:repeat(2,1fr)}.stats div{padding:13px 15px}.panel,.sources{padding:20px 18px}.mode-grid{grid-template-columns:1fr 1fr}.filters{grid-template-columns:1fr 1fr}.filters .search{grid-column:1/-1}.panel-title{align-items:flex-start;gap:12px}.panel-title span{max-width:45%;text-align:right}.question-card{padding:22px 18px;min-height:0}.question-card h2{font-size:19px}.question-actions{flex-wrap:wrap}.question-actions .primary-btn{flex:1}.nav-row{gap:8px}.nav-row button{padding:9px 13px}.sheet-grid{grid-template-columns:repeat(6,1fr)}}
@media(max-width:430px){.hero-ring{display:none}.mode-grid{grid-template-columns:1fr}.filters{grid-template-columns:1fr}.filters .search{grid-column:auto}.result-card{padding:32px 20px}.question-meta{flex-wrap:wrap}.question-meta span:last-child{margin-left:0}}