:root{--bg:#f6f5fb;--card:#fff;--txt:#17142b;--mute:#6b6880;--line:#e6e3f2;--pri:#6d28d9;--pri2:#8b5cf6;--ok:#16a34a;--ok-bg:#dcfce7;--ko:#dc2626;--ko-bg:#fee2e2;--warn:#f59e0b;--shadow:0 6px 24px rgba(40,20,90,.08);--r:20px}
@media(prefers-color-scheme:dark){:root{--bg:#0f0d1a;--card:#1b1830;--txt:#f2f0fa;--mute:#a6a2bd;--line:#2d2948;--ok-bg:#12351f;--ko-bg:#3d1515;--shadow:0 6px 24px rgba(0,0,0,.35)}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--txt);font:16px/1.5 Inter,-apple-system,"Segoe UI",Roboto,sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--pri2)}button{font:inherit;color:inherit}
header{position:sticky;top:0;z-index:5;background:color-mix(in srgb,var(--bg) 85%,transparent);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
header .in{max-width:880px;margin:auto;padding:10px 16px;display:flex;align-items:center;justify-content:space-between;gap:10px}
.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--txt);font-weight:800;font-size:20px;letter-spacing:-.02em}
.brand span b{color:var(--pri2)}
nav.top{display:flex;gap:4px}
nav.top a{white-space:nowrap;text-decoration:none;color:var(--mute);font-weight:600;font-size:14px;padding:8px 10px;border-radius:12px}
nav.top a.on,nav.top a:hover{color:var(--txt);background:var(--card)}
main{max-width:880px;margin:auto;padding:18px 16px 90px}
h1{font-size:clamp(28px,6vw,42px);line-height:1.1;letter-spacing:-.03em;margin:14px 0 10px}
h2{font-size:22px;letter-spacing:-.02em;margin:28px 0 12px}
.lead{color:var(--mute);font-size:18px;margin:0 0 18px}
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--shadow);padding:20px;border:1px solid var(--line)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.topic{display:block;text-decoration:none;color:var(--txt);position:relative;overflow:hidden;transition:transform .15s}
.topic:hover{transform:translateY(-2px)}
.topic .ic{width:52px;height:52px;border-radius:16px;display:grid;place-items:center;font-size:26px;color:#fff;margin-bottom:12px}
.topic b{display:block;font-size:19px;margin-bottom:4px}.topic p{margin:0 0 12px;color:var(--mute);font-size:14px}
.bar{height:8px;border-radius:8px;background:var(--line);overflow:hidden}.bar i{display:block;height:100%;border-radius:8px;background:var(--pri2)}
.meta{font-size:13px;color:var(--mute);margin-top:6px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:14px;padding:13px 20px;font-weight:700;font-size:16px;cursor:pointer;background:var(--pri);color:#fff;text-decoration:none;min-height:48px}
.btn:hover{filter:brightness(1.08)}.btn.ghost{background:var(--card);color:var(--txt);border:1px solid var(--line)}
.btn.block{width:100%}.btn[disabled]{opacity:.45;cursor:default}
.row{display:flex;gap:10px;flex-wrap:wrap}
.hero{background:linear-gradient(135deg,#6d28d9,#8b5cf6 55%,#f59e0b);color:#fff;border:0;padding:26px}
.hero h1{margin-top:0}.hero p{color:#efeaff;margin:0 0 16px;font-size:17px}
.hero .btn{background:#fff;color:#4c1d95}
.chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}
.chip{border:1px solid var(--line);background:var(--card);border-radius:999px;padding:8px 14px;font-weight:600;font-size:14px;cursor:pointer;color:var(--txt);text-decoration:none}
.chip.on{background:var(--pri);color:#fff;border-color:var(--pri)}
.modes{display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:12px}
.mode{text-align:left;cursor:pointer;border:1px solid var(--line)}
.mode b{display:block;font-size:17px;margin-bottom:4px}.mode span{color:var(--mute);font-size:14px}
.qtop{display:flex;justify-content:space-between;align-items:center;gap:10px;color:var(--mute);font-size:14px;font-weight:600;margin-bottom:10px}
.prog{height:6px;background:var(--line);border-radius:6px;overflow:hidden;margin-bottom:16px}.prog i{display:block;height:100%;background:var(--pri2);transition:width .3s}
.qtext{font-size:20px;font-weight:700;line-height:1.35;margin:4px 0 14px}
.multi{display:inline-block;font-size:13px;font-weight:700;color:var(--pri2);background:color-mix(in srgb,var(--pri2) 14%,transparent);border-radius:8px;padding:3px 8px;margin-bottom:8px}
.sign{display:flex;justify-content:center;margin:4px 0 16px}.sign svg{width:150px;height:150px}
.choices{display:grid;gap:10px}
.choice{display:flex;gap:12px;align-items:flex-start;text-align:left;width:100%;background:var(--card);border:2px solid var(--line);border-radius:16px;padding:14px;cursor:pointer;font-size:16px;line-height:1.4}
.choice .k{flex:0 0 30px;height:30px;border-radius:9px;display:grid;place-items:center;font-weight:800;background:var(--bg);font-size:14px}
.choice.sel{border-color:var(--pri2);background:color-mix(in srgb,var(--pri2) 9%,var(--card))}.choice.sel .k{background:var(--pri2);color:#fff}
.choice.good{border-color:var(--ok);background:var(--ok-bg)}.choice.good .k{background:var(--ok);color:#fff}
.choice.bad{border-color:var(--ko);background:var(--ko-bg)}.choice.bad .k{background:var(--ko);color:#fff}
.choice[disabled]{cursor:default}
.fb{margin-top:16px;border-radius:16px;padding:14px 16px;font-size:15px}
.fb.ok{background:var(--ok-bg)}.fb.ko{background:var(--ko-bg)}.fb b{display:block;font-size:17px;margin-bottom:4px}
.actions{padding:16px 0 calc(16px + env(safe-area-inset-bottom));margin-top:4px}
.timer{font-variant-numeric:tabular-nums;font-weight:800}.timer.low{color:var(--ko)}
.score{text-align:center}.score .big{font-size:64px;font-weight:900;letter-spacing:-.04em;line-height:1}
.score .ok{color:var(--ok)}.score .ko{color:var(--ko)}
.review{display:grid;gap:10px;margin-top:14px}
.review .card{padding:14px}.review .ans{font-size:14px;margin-top:6px}.review .exp{font-size:14px;color:var(--mute);margin-top:6px}
.stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:12px}
.stat .card{text-align:center;padding:16px}.stat b{display:block;font-size:30px;letter-spacing:-.03em}.stat span{color:var(--mute);font-size:13px}
.book{display:flex;gap:14px;align-items:center}.book .cv{flex:0 0 64px;height:88px;border-radius:8px;background:linear-gradient(160deg,#0f3a4a,#060c1c);color:#2dd4bf;display:grid;place-items:center;font-weight:900;font-size:24px}
.book b{display:block}.book p{margin:2px 0 8px;color:var(--mute);font-size:14px}
footer{max-width:880px;margin:auto;padding:24px 16px 40px;color:var(--mute);font-size:13px;text-align:center}
.empty{color:var(--mute);text-align:center;padding:24px}
.tag{display:inline-block;font-size:12px;font-weight:700;padding:3px 8px;border-radius:8px;background:var(--bg);color:var(--mute)}
@media(max-width:560px){nav.top{gap:0}nav.top a{padding:7px 6px;font-size:13px}.brand{font-size:17px;gap:6px}.brand img{width:26px;height:26px}.qtext{font-size:18px}}

.review .sign svg{width:70px;height:70px}.review .sign{justify-content:flex-start;margin:8px 0}