:root{
  --primary:#155eef;
  --primary-dark:#0b46bd;
  --accent:#06b6d4;
  --dark:#071b5f;
  --text:#334155;
  --muted:#64748b;
  --bg:#f4f9ff;
  --border:#dbeafe;
  --good:#15803d;
  --bad:#b91c1c;
  --shadow:0 18px 45px rgba(15,23,42,.09);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--text);line-height:1.6;background:radial-gradient(circle at top left,rgba(21,94,239,.14),transparent 32rem),radial-gradient(circle at bottom right,rgba(6,182,212,.11),transparent 30rem),var(--bg)}
button{font:inherit}
button,a{-webkit-tap-highlight-color:transparent}
:focus-visible{outline:3px solid rgba(6,182,212,.55);outline-offset:3px}
.page{width:min(1020px,calc(100% - 40px));margin:auto;padding:22px 0 72px}
.top{display:flex;align-items:center;justify-content:space-between;gap:18px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;color:var(--dark);font-size:19px;font-weight:900;text-decoration:none}
.brand-mark{width:38px;height:38px;display:grid;place-items:center;border-radius:13px;color:#fff;background:linear-gradient(135deg,var(--primary),var(--accent));font-size:0}
.brand-mark::after{content:"M";font-family:Georgia,"Times New Roman",serif;font-size:1.25rem;font-style:italic;line-height:1}
.back,.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:11px 17px;border:1px solid transparent;border-radius:14px;font-weight:850;text-decoration:none;cursor:pointer}
.back,.btn-secondary{color:var(--primary-dark);background:#fff;border-color:#bfdbfe}
.mobile-icon-back svg{display:none;width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:2.4;stroke-linecap:round;stroke-linejoin:round}
.btn-primary{color:#fff;background:linear-gradient(135deg,var(--primary),var(--accent));box-shadow:0 10px 22px rgba(21,94,239,.2)}
.hero{margin:27px 0 18px;padding:36px;border:1px solid var(--border);border-radius:28px;background:linear-gradient(135deg,#fff,#eef7ff);box-shadow:var(--shadow)}
.badge{display:inline-flex;padding:7px 12px;border-radius:999px;color:#0369a1;background:#e0f2fe;font-size:12px;font-weight:900;letter-spacing:.06em;text-transform:uppercase}
h1,h2{color:var(--dark);line-height:1.15}
h1{margin:13px 0 9px;font-size:clamp(32px,5vw,50px);letter-spacing:-.045em}
.hero p{max-width:740px;margin:0;color:#52627a;font-size:16px}
.meta{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-bottom:20px}
.meta>div{padding:14px 16px;border:1px solid var(--border);border-radius:16px;background:#fff}
.meta strong{color:var(--dark)}
.progress{height:8px;margin-top:9px;border-radius:999px;background:#e2e8f0;overflow:hidden}
.progress span{display:block;width:0;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--primary),var(--accent));transition:width .25s}
.quiz{display:grid;gap:17px}
.question{padding:23px;border:1px solid var(--border);border-radius:22px;background:#fff;box-shadow:0 10px 26px rgba(15,23,42,.055)}
.question.unanswered{border-color:#f59e0b;box-shadow:0 0 0 3px rgba(245,158,11,.12)}
.question-head{display:flex;align-items:flex-start;gap:12px;color:var(--dark);font-weight:850;font-size:17px}
.number{flex:0 0 auto;width:36px;height:36px;display:grid;place-items:center;border-radius:11px;color:#fff;background:linear-gradient(135deg,var(--primary),var(--accent));font-weight:900}
.answers{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:15px}
.answer{min-height:52px;padding:12px 14px;text-align:left;border:2px solid #dbeafe;border-radius:14px;background:#f8fbff;color:var(--text);cursor:pointer;font-weight:700;transition:.16s}
.answer:hover:not(:disabled),.answer.selected{border-color:#60a5fa;background:#eff6ff;transform:translateY(-1px)}
.answer.correct{border-color:#22c55e;background:#f0fdf4;color:#166534}
.answer.wrong{border-color:#ef4444;background:#fef2f2;color:#991b1b}
.feedback{display:none;margin-top:13px;padding:12px 14px;border-radius:13px;background:#eff6ff;color:#334155;border-left:4px solid var(--primary);font-size:14px}
.question.checked .feedback{display:block}
.feedback-explanation{display:block;margin-top:7px;line-height:1.55}
.controls{display:flex;align-items:center;justify-content:space-between;gap:16px;margin:25px 0}
.notice{min-height:24px;color:#9a3412;font-weight:750}
.result{display:none;margin-top:28px;padding:30px;text-align:center;border:2px solid #bfdbfe;border-radius:26px;background:#fff;box-shadow:var(--shadow)}
.result.show{display:block}
.result.passed{background:#f0fdf4;border-color:#86efac}
.result.failed{background:#fff7ed;border-color:#fdba74}
.result-score{color:var(--primary-dark);font-size:clamp(44px,7vw,68px);font-weight:950;line-height:1;text-shadow:0 2px 0 #dbeafe}
.result h2{margin:10px 0 7px;font-size:28px}
.result p{margin:0 auto;color:var(--text);max-width:680px}
.result-actions{display:flex;justify-content:center;flex-wrap:wrap;gap:11px;margin-top:20px}
@media(max-width:700px){
  .page{width:min(100% - 24px,1020px);padding-top:10px}
  .top{align-items:center;flex-direction:row;padding:8px 0;min-height:64px}.top .brand>span:last-child{display:none}.top .brand{width:38px;overflow:hidden}.top .back{width:40px;min-width:40px;height:40px;min-height:40px;padding:0;border-radius:12px}.mobile-icon-back svg{display:block}.mobile-icon-back span{display:none}
  .hero{padding:27px 21px}.meta{grid-template-columns:1fr}.answers{grid-template-columns:1fr}
  .question{padding:19px 15px}.controls{align-items:stretch;flex-direction:column}.controls .btn{width:100%}
  .result{padding:25px 17px}.result-actions{flex-direction:column}.result-actions .btn{width:100%}
}