:root{--bg:#f6f7fb;--card:#fff;--text:#1b2333;--muted:#5f6b7e;--line:#e3e7ef;--brand:#2554d8;--brand-dark:#1a3fa8;--ok:#12a05c;--bad:#d63b3b;--warn:#e08a00;--purple:#7a4bd6}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.6}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{margin:0 0 .6rem;line-height:1.25}h1{font-size:clamp(1.7rem,4vw,2.5rem)}h2{font-size:1.5rem}h3{font-size:1.15rem}p{margin:0 0 1rem}.container{max-width:1080px;margin:0 auto;padding:0 16px}.narrow{max-width:460px}.page{padding:32px 0 56px}.muted{color:var(--muted)}.small{font-size:.85rem}.center{text-align:center}.error{color:var(--bad);margin:.5rem 0 0}.success{color:var(--ok)}.header{border-bottom:1px solid var(--line);z-index:20;background:#fff;position:sticky;top:0}.header-in{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;min-height:58px;display:flex}.brand{color:var(--text);font-size:1.3rem;font-weight:800}.brand span{color:var(--brand)}.nav{flex-wrap:wrap;align-items:center;gap:16px;font-size:.95rem;display:flex}.nav a{color:var(--text)}.linklike{color:var(--text);font:inherit;cursor:pointer;background:0 0;border:0;padding:0}.btn{background:var(--brand);cursor:pointer;border:0;border-radius:8px;padding:11px 20px;font-size:1rem;font-weight:600;display:inline-block;color:#fff!important;text-decoration:none!important}.btn:hover{background:var(--brand-dark)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn-sm{padding:6px 14px;font-size:.9rem}.btn-outline{border:1.5px solid var(--brand);background:#fff;color:var(--brand)!important}.btn-outline:hover{background:#eef2ff}.btn-danger{background:var(--bad)}.btn-ok{background:var(--ok)}.btn-purple{background:var(--purple)}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:20px}.grid{gap:16px;display:grid}.grid-3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}.hero{text-align:center;padding:56px 0 40px}.hero p{max-width:640px;color:var(--muted);margin:0 auto 1.4rem;font-size:1.1rem}.hero .actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.badge{color:var(--ok);background:#e6f6ee;border-radius:99px;padding:2px 9px;font-size:.75rem;font-weight:700;display:inline-block}.badge.premium{color:var(--warn);background:#fff1d6}.badge.off{color:#777;background:#eee}label{margin:14px 0 4px;font-size:.92rem;font-weight:600;display:block}input,textarea,select{width:100%;font:inherit;background:#fff;border:1px solid #c9d0de;border-radius:8px;padding:10px 12px}input:focus,textarea:focus,select:focus{border-color:var(--brand);outline:2px solid #b9c9ff}.check{align-items:center;gap:8px;margin-top:10px;font-weight:400;display:flex}.check input{width:auto}textarea.code{min-height:220px;font-family:ui-monospace,Menlo,Consolas,monospace;font-size:.85rem}table{border-collapse:collapse;background:#fff;width:100%}th,td{text-align:left;border-bottom:1px solid var(--line);padding:9px 12px;font-size:.93rem}th{background:#f0f3fa}.table-wrap{border:1px solid var(--line);border-radius:10px;overflow-x:auto}.footer{border-top:1px solid var(--line);background:#fff;padding:24px 0}.footer-links{flex-wrap:wrap;gap:18px;margin-bottom:10px;display:flex}.ad{text-align:center;min-height:90px;margin:20px 0}.prose h2{margin-top:1.8rem}.prose ul{padding-left:1.2rem}.row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.space{justify-content:space-between}.stat{font-size:2rem;font-weight:800}.exam-top{border-bottom:1px solid var(--line);z-index:10;background:#fff;padding:10px 0;position:sticky;top:58px}.sec-tabs{flex-wrap:wrap;gap:6px;display:flex}.sec-tab{color:#666;background:#eef0f5;border-radius:99px;padding:4px 12px;font-size:.85rem}.sec-tab.active{background:var(--brand);color:#fff}.sec-tab.done{color:var(--ok);background:#dff3e8}.timer{font-variant-numeric:tabular-nums;font-size:1.5rem;font-weight:800}.timer.low{color:var(--bad)}.exam-body{grid-template-columns:1fr 300px;gap:16px;margin-top:16px;display:grid}@media (max-width:800px){.exam-body{grid-template-columns:1fr}}.q-text{white-space:pre-wrap;margin-bottom:14px;font-size:1.1rem}.opt{border:1.5px solid var(--line);cursor:pointer;background:#fff;border-radius:10px;align-items:flex-start;gap:10px;margin-bottom:10px;padding:11px 14px;display:flex}.opt:hover{border-color:#aab9ee}.opt.sel{border-color:var(--brand);background:#eef2ff}.opt input{width:auto;margin-top:5px}.palette{grid-template-columns:repeat(5,1fr);gap:8px;display:grid}.pq{cursor:pointer;background:#fff;border:1.5px solid #cfd5e2;border-radius:8px;padding:7px 0;font-weight:600}.pq.visited{border-color:var(--bad);background:#fde4e4}.pq.answered{border-color:var(--ok);background:#dff3e8}.pq.marked{border-color:var(--purple);background:#ece3fb}.pq.current{outline:3px solid #9db5ff}.legend{color:var(--muted);flex-wrap:wrap;gap:10px;margin-top:12px;font-size:.78rem;display:flex}.legend i{vertical-align:-1px;border:1.5px solid #cfd5e2;border-radius:3px;width:12px;height:12px;margin-right:4px;display:inline-block}.rev-ok{border-color:var(--ok)!important;background:#eaf8f0!important}.rev-bad{border-color:var(--bad)!important;background:#fdecec!important}.explain{background:#f3f6ff;border-radius:8px;margin-top:8px;padding:10px 14px;font-size:.93rem}