:root{--bg:#0d1520;--panel:#161f2c;--panel2:#1a2635;--ink:#eef3f9;--mute:#9db0c4;--line:#2a3a4e;--acc:#59aef5;--btn:#1976d2;--btn-ink:#fff;--hero1:#14508f;--hero2:#0e3a6b;--ok:#4ade80;--okbg:#0f2f1f;--bad:#f87171;--badbg:#361818;--flag:#fbbf24;--sel:#1b2c40;--on:#1976d2}
@media (prefers-color-scheme:light){:root:not([data-theme=dark]){--bg:#f3f6fa;--panel:#fff;--panel2:#f7f9fc;--ink:#14202e;--mute:#5a6a7d;--line:#d5dde7;--acc:#1565c0;--sel:#e8f2fd;--ok:#15803d;--okbg:#e7f6ec;--bad:#b91c1c;--badbg:#fdecec;--flag:#b45309}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}
.wrap{max-width:1104px;margin:0 auto;padding:0 16px}
.head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding-top:20px;padding-bottom:14px;flex-wrap:wrap}
.brand{font-weight:800;font-size:1.35rem;color:var(--ink);text-decoration:none}
.sub{margin:2px 0 0;color:var(--mute);font-size:.9rem}
.timer{font-variant-numeric:tabular-nums;font-weight:700;color:var(--acc)}.timer.low{color:var(--bad)}
main{padding-bottom:20px}
h1{margin:0 0 8px;font-size:2rem}
h2{display:flex;align-items:center;gap:10px;font-size:1.1rem;margin:0 0 14px;color:var(--ink)}h2 svg{color:var(--acc)}h2.plain{margin-bottom:10px}
.hero{background:linear-gradient(135deg,var(--hero1),var(--hero2));border-radius:14px;padding:40px 48px;margin-bottom:24px;color:#fff}
.hero p{max-width:700px;margin:0 0 22px;font-size:1.05rem;color:#e6f0fb}
.chips{display:flex;gap:16px;flex-wrap:wrap}
.chip{background:rgba(255,255,255,.14);border-radius:10px;padding:12px 22px;min-width:120px}
.chip span{display:block;font-size:.75rem;letter-spacing:.06em;color:#cfe2f6}.chip b{font-size:1.5rem}
.panel,.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:22px 28px;margin-bottom:20px}
.card{padding:18px 22px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:14px}
.modecard,.topic{text-align:left;background:var(--panel2);border:1.5px solid var(--line);border-radius:12px;color:var(--ink);padding:18px 22px;cursor:pointer;font:inherit}
.modecard{display:flex;flex-direction:column;gap:6px;align-items:flex-start;min-height:140px}
.modecard svg{color:var(--acc);align-self:center}.modecard b{margin-top:6px}.modecard span,.topic span{color:var(--mute);font-size:.92rem}
.topic{display:flex;flex-direction:column;gap:6px;padding:16px 20px}
.modecard.on,.topic.on{border-color:var(--acc);background:var(--sel);box-shadow:0 0 0 1px var(--acc) inset}
.modecard:hover,.topic:hover,.pill:hover{border-color:var(--acc)}
.lbl{font-size:.75rem;letter-spacing:.08em;color:var(--mute);font-weight:700;margin:18px 0 8px}
.pill{font:inherit;font-weight:600;background:var(--panel2);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:10px 20px;cursor:pointer}
.pill.on{background:var(--on);border-color:var(--on);color:#fff}
.row{display:flex;flex-wrap:wrap;align-items:center}.gap{gap:12px}.between{justify-content:space-between}
input[type=number]{font:inherit;width:90px;padding:10px 12px;border-radius:10px;border:1px solid var(--line);background:var(--panel2);color:var(--ink);text-align:center}
button{font:inherit;cursor:pointer}
button.outline{background:transparent;color:var(--acc);border:1.5px solid var(--acc);border-radius:10px;padding:10px 22px;font-size:1rem}
button.outline:hover{background:var(--sel)}
button.primary{background:var(--btn);color:var(--btn-ink);border:1px solid var(--btn);border-radius:10px;padding:9px 18px;font-weight:700}
button:not(.pill):not(.start):not(.outline):not(.primary):not(.modecard):not(.topic){background:var(--panel2);color:var(--ink);border:1px solid var(--line);border-radius:10px;padding:9px 16px}
button:disabled{opacity:.5;cursor:not-allowed}
.start{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;background:var(--btn);color:#fff;border:0;border-radius:10px;padding:15px;font-size:1.2rem;font-weight:700;box-shadow:0 6px 18px rgba(25,118,210,.3)}
.start:hover:not(:disabled){filter:brightness(1.1)}
.center{text-align:center;margin:10px 0 22px}
.muted{color:var(--mute);font-size:.92rem}
button:focus-visible,input:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--acc);outline-offset:2px}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:14px;margin-bottom:14px}
.stat{background:var(--panel2);border-radius:10px;padding:12px 16px}.stat b{display:block;font-size:1.6rem}.stat span{color:var(--mute);font-size:.9rem}
.bar-row{display:grid;grid-template-columns:minmax(0,300px) 1fr 70px;gap:12px;align-items:center;margin:8px 0;font-size:.92rem}
.track{height:10px;background:var(--line);border-radius:6px;overflow:hidden}.fill{height:100%;background:var(--acc)}
.qhead{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;color:var(--mute);font-size:.9rem;margin-bottom:10px}
label.chk{display:flex;gap:8px;align-items:center}
.stem{white-space:pre-line;margin:0 0 16px;font-size:1.02rem}
.opt{display:flex;gap:12px;align-items:flex-start;border:1.5px solid var(--line);background:var(--panel2);border-radius:12px;padding:12px 16px;margin:10px 0;cursor:pointer}
.opt:hover{border-color:var(--acc)}.opt.sel{background:var(--sel);border-color:var(--acc)}
.opt.correct{background:var(--okbg);border-color:var(--ok)}.opt.wrong{background:var(--badbg);border-color:var(--bad)}
.opt .k{font-weight:700;min-width:1.4em}.opt input{margin-top:5px}
.fb{border-left:4px solid var(--acc);padding:8px 14px;margin-top:14px;background:var(--panel2);border-radius:0 10px 10px 0;white-space:pre-line}
.fb.ok{border-color:var(--ok)}.fb.no{border-color:var(--bad)}
.nav{display:flex;flex-wrap:wrap;gap:6px;margin-top:16px}
.nav button{min-width:38px;padding:4px 8px!important;font-size:.85rem}
.nav .cur{outline:2px solid var(--acc)}.nav .ans{background:var(--sel)!important}.nav .fl{border-color:var(--flag)!important;border-style:dashed!important}
.nav .ok{background:var(--okbg)!important}.nav .no{background:var(--badbg)!important}
.actions{display:flex;gap:8px;flex-wrap:wrap;justify-content:space-between;margin-top:18px}
details.rev{border:1px solid var(--line);border-radius:12px;margin:10px 0;padding:10px 16px;background:var(--panel)}
details.rev summary{cursor:pointer}
.tag{font-size:.78rem;border-radius:999px;padding:1px 9px;margin-left:8px}.tag.ok{background:var(--okbg);color:var(--ok)}.tag.no{background:var(--badbg);color:var(--bad)}.tag.sk{background:var(--line);color:var(--mute)}
table{border-collapse:collapse;width:100%;font-size:.92rem;margin-top:14px}th,td{text-align:left;padding:6px 8px;border-bottom:1px solid var(--line)}
.foot{color:var(--mute);font-size:.85rem;padding-bottom:30px}
a{color:var(--acc)}
@media (max-width:700px){.two{grid-template-columns:1fr}.hero{padding:26px 22px}.panel{padding:18px}.bar-row{grid-template-columns:1fr 70px}.bar-row .track{grid-column:1/-1;order:3}}
.navwrap{margin-top:16px}.navtoggle{font-size:.9rem;color:var(--acc)!important}.nav[hidden]{display:none}