:root{color:#161616;font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;background:#f7f7f2;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button{font:inherit}.app-shell{background:linear-gradient(#ffffff9e,#f7f7f2db),repeating-linear-gradient(90deg,#16161609 0 1px,#0000 1px 76px),#f7f7f2;place-items:center;min-height:100vh;padding:24px;display:grid}.start-screen,.quiz-screen{text-align:center;width:min(100%,760px)}.brand{color:#58625b;letter-spacing:.16em;text-transform:uppercase;margin:0 0 14px;font-size:.78rem;font-weight:800}h1,h2,p{margin-top:0}h1{letter-spacing:0;margin-bottom:24px;font-size:clamp(2.75rem,9vw,6.8rem);line-height:.92}.score-line{color:#58625b;justify-content:center;gap:14px;min-height:24px;margin-bottom:34px;font-size:.95rem;font-weight:700;display:flex}.student-form{gap:12px;width:min(100%,380px);margin:0 auto;display:grid}.student-form label{color:#58625b;text-align:left;font-weight:900}.student-form input,.student-form textarea{color:#161616;width:100%;min-height:58px;font:inherit;resize:vertical;background:#ffffffdb;border:1px solid #1616162e;border-radius:8px;outline:none;padding:0 16px;font-size:1.08rem;font-weight:800;transition:border-color .16s,box-shadow .16s}.student-form textarea{min-height:140px;padding-top:14px;line-height:1.55}.student-form input:focus,.student-form textarea:focus{border-color:#276b55;box-shadow:0 0 0 4px #276b5524}.question-form{width:min(100%,520px)}.form-error{color:#bd4138;text-align:left;min-height:22px;margin:0 0 8px;font-size:.9rem;font-weight:800}.offline-start{justify-items:center;gap:24px;display:grid}.start-note{color:#58625b;max-width:520px;margin:0;font-weight:800;line-height:1.65}.start-button{color:#fff;cursor:pointer;background:#151515;border:0;border-radius:8px;min-width:180px;min-height:56px;padding:0 28px;font-size:1.05rem;font-weight:800;transition:transform .16s,background .16s,box-shadow .16s;box-shadow:0 18px 40px #15151529}.start-button:hover,.start-button:focus-visible{background:#276b55;outline:none;transform:translateY(-2px);box-shadow:0 20px 44px #276b5538}.quiz-screen{place-items:center;gap:34px;display:grid}.round-meta{color:#58625b;justify-content:center;gap:18px;min-height:28px;font-weight:800;display:flex}.round-meta span:last-child{color:#bf3d35}.question-title{letter-spacing:0;text-align:center;place-items:center;min-height:210px;margin:0;padding:18px 0;font-size:clamp(2rem,6vw,4.5rem);font-weight:900;line-height:1.13;display:grid}.options-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;width:min(100%,640px);display:grid}.option-button{color:#161616;cursor:pointer;text-align:center;background:#ffffffd1;border:1px solid #16161624;border-radius:8px;min-height:64px;padding:10px 18px;font-weight:800;line-height:1.25;transition:transform .15s,border-color .15s,background .15s,box-shadow .15s;box-shadow:0 10px 28px #1616160f}.option-button:hover:not(:disabled),.option-button:focus-visible{background:#fff;border-color:#276b55;outline:none;transform:translateY(-2px);box-shadow:0 16px 34px #276b5524}.option-button:disabled{cursor:default}.option-button.is-correct{color:#123d2d;background:#e8f6ee;border-color:#237653}.option-button.is-wrong{color:#5a1713;background:#fdebea;border-color:#bd4138}.option-button.is-dimmed{opacity:.7}.answer-feedback{min-height:28px;margin:-10px 0 0;font-size:1rem;font-weight:900}.answer-feedback.is-good{color:#237653}.answer-feedback.is-bad{color:#bd4138}.complete-screen{text-align:center;width:min(100%,760px)}.credential-card{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;width:min(100%,560px);margin:0 auto 20px;display:grid}.credential-card .question-record{grid-column:1/-1}.credential-card div{text-align:left;background:#ffffffdb;border:1px solid #16161624;border-radius:8px;gap:7px;min-height:88px;padding:16px;display:grid;box-shadow:0 10px 28px #1616160f}.credential-card span{color:#58625b;font-size:.84rem;font-weight:900}.credential-card strong{overflow-wrap:anywhere;font-size:1.2rem}.credential-preview{border:1px solid #16161629;border-radius:8px;width:min(100%,560px);margin:0 auto 20px;display:block;box-shadow:0 18px 44px #1616161f}.complete-actions{flex-wrap:wrap;justify-content:center;gap:12px;display:flex}.ghost-button{color:#161616;cursor:pointer;background:#ffffffc2;border:1px solid #16161629;border-radius:8px;min-width:132px;min-height:56px;padding:0 22px;font-weight:900}.ghost-button:hover,.ghost-button:focus-visible{border-color:#276b55;outline:none}@media (width<=640px){.app-shell{padding:18px}h1{margin-bottom:20px}.score-line{gap:6px;margin-bottom:28px;display:grid}.quiz-screen{gap:24px}.question-title{min-height:250px;font-size:clamp(2rem,10vw,3.25rem)}.options-list,.credential-card{grid-template-columns:1fr}.complete-actions{display:grid}}