:root{
    --bg:#EBF0F1;--surface:#FFFFFF;--surface-2:#F4F8F8;--ink:#0A2A33;--ink-2:#3A5860;--muted:#6E858C;
    --primary:#0E7C86;--primary-700:#0A5A63;--primary-050:#E1F0F1;--accent:#E0A02C;--accent-050:#FBF1DD;
    --good:#1C8A5A;--good-bg:#E7F4EE;--good-line:#B7E0CB;--bad:#C23B22;--bad-bg:#FBEBE6;--bad-line:#EEC4B8;
    --blue:#2E6FB0;--line:#D6E0E2;--line-2:#C4D2D4;--shadow:0 1px 2px rgba(10,42,51,.05),0 8px 24px rgba(10,42,51,.06);
  }
  *{box-sizing:border-box}
  body{margin:0;background:var(--bg);color:var(--ink);font-family:"IBM Plex Sans",system-ui,sans-serif;line-height:1.55;-webkit-font-smoothing:antialiased}
  .mono{font-family:"IBM Plex Mono",monospace;font-variant-numeric:tabular-nums}
  h1,h2,h3{margin:0;font-family:"Fraunces",Georgia,serif;font-weight:500;letter-spacing:-.01em;line-height:1.14}
  button{font-family:inherit;cursor:pointer}
  header.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.88);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
  .top-in{max-width:900px;margin:0 auto;padding:12px 22px;display:flex;align-items:center;gap:12px}
  .mark{width:30px;height:30px;border-radius:8px;background:radial-gradient(circle at 32% 30%,var(--accent),transparent 55%),linear-gradient(135deg,var(--primary),var(--primary-700));display:grid;place-items:center;color:#fff;font-family:"Fraunces",serif;font-weight:600;font-size:16px}
  .top b{font-family:"Fraunces",serif;font-weight:600;font-size:16px}
  .top small{display:block;font-family:"IBM Plex Mono",monospace;font-size:10px;letter-spacing:.14em;color:var(--muted);text-transform:uppercase;margin-top:-2px}
  .count{margin-left:auto;font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--muted);background:var(--surface-2);border:1px solid var(--line);padding:5px 10px;border-radius:8px}
  .wrap{max-width:900px;margin:0 auto;padding:30px 22px 90px}
  .eyebrow{font-family:"IBM Plex Mono",monospace;font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--primary-700);font-weight:600}
  .hero{background:var(--surface);border:1px solid var(--line);border-radius:20px;padding:34px 36px;box-shadow:var(--shadow)}
  .hero h1{font-size:clamp(27px,4.5vw,38px);margin:12px 0 10px;max-width:20ch}
  .hero p{font-size:16px;color:var(--ink-2);max-width:60ch;margin:0 0 22px}
  .cta-row{display:flex;gap:12px;flex-wrap:wrap}
  .btn{border:1px solid transparent;border-radius:11px;padding:12px 20px;font-weight:600;font-size:15px;transition:.15s;text-decoration:none;display:inline-block}
  .btn.primary{background:var(--primary);color:#fff}.btn.primary:hover{background:var(--primary-700)}
  .btn.ghost{background:var(--surface);border-color:var(--line-2);color:var(--ink)}.btn.ghost:hover{border-color:var(--primary);color:var(--primary-700)}
  .tag{display:inline-block;font-family:"IBM Plex Mono",monospace;font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;padding:3px 8px;border-radius:6px;font-weight:600;background:var(--primary-050);color:var(--primary-700)}
  .qbar{display:flex;align-items:center;gap:16px;margin-bottom:16px;flex-wrap:wrap}
  .qbar .meta{font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--muted)}
  .timer{margin-left:auto;font-family:"IBM Plex Mono",monospace;font-weight:600;font-size:15px;background:var(--surface);border:1px solid var(--line);padding:6px 12px;border-radius:9px}
  .timer.warn{color:var(--bad);border-color:var(--bad-line);background:var(--bad-bg)}
  .track{height:6px;border-radius:4px;background:var(--surface);border:1px solid var(--line);overflow:hidden;margin-bottom:22px}
  .track>i{display:block;height:100%;background:linear-gradient(90deg,var(--primary),var(--primary-700))}
  .qcard{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:30px 32px;box-shadow:var(--shadow)}
  .topic{font-family:"IBM Plex Mono",monospace;font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:14px 0 6px}
  .stem{font-size:18px;line-height:1.5;margin:0 0 22px}
  .opts{display:grid;gap:11px}
  .opt{display:flex;gap:14px;align-items:flex-start;text-align:left;width:100%;background:var(--surface);border:1.5px solid var(--line);border-radius:13px;padding:15px 17px;font-size:15.5px;color:var(--ink);transition:.12s}
  .opt:hover:not(:disabled){border-color:var(--primary);background:var(--surface-2)}
  .opt .ltr{flex:0 0 auto;width:26px;height:26px;border-radius:7px;background:var(--surface-2);border:1px solid var(--line);display:grid;place-items:center;font-family:"IBM Plex Mono",monospace;font-weight:600;font-size:13px;color:var(--ink-2)}
  .opt.sel{border-color:var(--primary);background:var(--primary-050)}.opt.sel .ltr{background:var(--primary);color:#fff;border-color:var(--primary)}
  .opt.correct{border-color:var(--good-line);background:var(--good-bg)}.opt.correct .ltr{background:var(--good);color:#fff;border-color:var(--good)}
  .opt.wrong{border-color:var(--bad-line);background:var(--bad-bg)}.opt.wrong .ltr{background:var(--bad);color:#fff;border-color:var(--bad)}
  .opt:disabled{cursor:default}
  .opt .mk{margin-left:auto;font-family:"IBM Plex Mono",monospace;font-size:11px;font-weight:600;align-self:center}
  .opt.correct .mk{color:var(--good)}.opt.wrong .mk{color:var(--bad)}
  .explain{margin-top:22px;border-top:1px solid var(--line);padding-top:20px;display:none}
  .explain.show{display:block}
  .verdict{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:14px;padding:5px 12px;border-radius:9px;margin-bottom:14px}
  .verdict.ok{background:var(--good-bg);color:var(--good)}.verdict.no{background:var(--bad-bg);color:var(--bad)}
  .explain h4{margin:0 0 8px;font-family:"IBM Plex Sans";font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);font-weight:700}
  .explain p.why{margin:0 0 16px;font-size:15px;line-height:1.6}
  .distractors{display:grid;gap:8px}
  .dist{font-size:13.5px;color:var(--ink-2);background:var(--surface-2);border:1px solid var(--line);border-radius:10px;padding:10px 13px}
  .dist .lbl{font-family:"IBM Plex Mono",monospace;font-size:9.5px;letter-spacing:.06em;text-transform:uppercase;font-weight:700;padding:2px 6px;border-radius:5px;margin-right:8px;white-space:nowrap}
  .dist.tempting .lbl{background:var(--accent);color:#3a2a05}
  .dist.partial .lbl{background:var(--blue);color:#fff}
  .dist.weaker .lbl{background:#98a7ab;color:#fff}
  .dist b{color:var(--ink);font-weight:600}
  .qnav{display:flex;gap:12px;margin-top:24px;align-items:center}
  .qnav .spacer{flex:1}
  .hidden{display:none}
  .result-hero{text-align:center;padding:34px}
  .result-hero .score{font-family:"Fraunces",serif;font-weight:600;font-size:64px;line-height:1}
  .result-hero .score i{font-style:normal;font-size:28px;color:var(--muted)}
  .verdict-lg{display:inline-block;margin-top:14px;font-weight:600;padding:8px 18px;border-radius:11px;font-size:15px}
  .rec{margin-top:16px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:24px 26px;box-shadow:var(--shadow)}
  .rec h3{font-size:20px;margin-bottom:4px}
  .rec .sub{color:var(--ink-2);font-size:14px;margin:0 0 16px}
  .area{display:flex;gap:14px;align-items:flex-start;padding:14px 0;border-bottom:1px dashed var(--line)}
  .area:last-child{border-bottom:0}
  .area .ic{flex:0 0 auto;width:40px;height:40px;border-radius:10px;display:grid;place-items:center;font-family:"Fraunces",serif;font-weight:600;color:#fff;font-size:16px}
  .area .body{flex:1}
  .area .nm{font-weight:600;font-size:15px}
  .area .nm span{font-family:"IBM Plex Mono",monospace;font-size:11px;color:var(--muted);font-weight:400;margin-left:6px}
  .area .desc{font-size:13.5px;color:var(--ink-2);margin-top:2px}
  .area .go{align-self:center;font-size:13px;font-weight:600;color:var(--primary-700);white-space:nowrap}
  .note{font-size:12.5px;color:var(--muted);line-height:1.5;margin-top:22px;padding:16px 18px;background:var(--surface-2);border:1px solid var(--line);border-radius:12px}

  .nav{position:sticky;top:53px;z-index:15;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
  .nav-in{max-width:900px;margin:0 auto;padding:0 22px;display:flex;gap:2px;overflow-x:auto}
  .nav button{background:none;border:0;padding:14px 15px;font-weight:600;font-size:14px;color:var(--muted);border-bottom:2px solid transparent;white-space:nowrap;font-family:inherit;cursor:pointer}
  .nav button.on{color:var(--primary-700);border-bottom-color:var(--primary)}
  .nav button:hover{color:var(--ink)}
  .grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:14px;margin:6px 0 22px}
  .stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px 20px;box-shadow:var(--shadow)}
  .stat .k{font-family:"IBM Plex Mono",monospace;font-size:10.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
  .stat .v{font-family:"Fraunces",serif;font-weight:600;font-size:30px;margin-top:6px;line-height:1}
  .stat .v i{font-style:normal;font-size:15px;color:var(--muted)}
  .dbar .row{display:flex;align-items:center;gap:10px;margin:9px 0}
  .dbar .nm{width:190px;font-size:13.5px;font-weight:600}
  .dbar .tr{flex:1;height:9px;border-radius:5px;background:var(--surface-2);border:1px solid var(--line);overflow:hidden}
  .dbar .tr>i{display:block;height:100%}
  .dbar .pc{width:96px;text-align:right;font-family:"IBM Plex Mono",monospace;font-size:12px;color:var(--ink-2)}
  .field{margin:12px 0}
  .field>label{display:block;font-family:"IBM Plex Mono",monospace;font-size:10.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600;margin-bottom:5px}
  .inp,.sel,.ta{width:100%;font-family:inherit;font-size:14.5px;color:var(--ink);background:var(--surface);border:1.5px solid var(--line);border-radius:10px;padding:10px 12px}
  .ta{min-height:74px;resize:vertical;line-height:1.5}
  .inp:focus,.sel:focus,.ta:focus{outline:none;border-color:var(--primary)}
  .row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  .row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
  @media(max-width:640px){.row2,.row3{grid-template-columns:1fr}}
  .opted{display:grid;grid-template-columns:1fr 150px;gap:10px;align-items:start;margin:8px 0;padding:11px;border:1px solid var(--line);border-radius:12px;background:var(--surface-2)}
  .opted .ra{grid-column:1/3}
  .imgprev{margin-top:10px}
  .imgprev img{max-width:100%;max-height:240px;border-radius:10px;border:1px solid var(--line);display:block}
  .qimg{max-width:100%;margin:0 0 18px;border-radius:12px;border:1px solid var(--line);display:block}
  .uq{display:flex;gap:12px;align-items:center;padding:12px 0;border-bottom:1px dashed var(--line)}
  .uq:last-child{border-bottom:0}
  .uq img{width:46px;height:46px;object-fit:cover;border-radius:8px;border:1px solid var(--line);flex:0 0 auto}
  .uq .ex{flex:1;font-size:14px;min-width:0}
  .uq .ex b{display:block;overflow:hidden;text-overflow:ellipsis}
  .btn.mini{font-size:12.5px;padding:8px 13px;border-radius:9px}
  .btn.danger{color:var(--bad);border-color:var(--bad-line)}
  .btn.danger:hover{border-color:var(--bad);color:var(--bad)}
  .banner{background:var(--accent-050);border:1px solid #EAD4A3;color:#6b4e12;font-size:12.5px;line-height:1.5;padding:11px 14px;border-radius:10px;margin-bottom:16px}
  .empty{text-align:center;color:var(--muted);padding:40px 20px}