:root{color:#172f44;font-synthesis:none;text-rendering:optimizelegibility;--ink:#172f44;--muted:#526b7d;--paper:#fff;--mist:#eaf2f8;--line:#c8d6e1;--hour:#d9533f;--minute:#1976a8;--focus:#f1b833;--success:#17704d;--success-bg:#e8f6ef;--retry:#8b572a;--retry-bg:#fff4df;background:#eaf2f8;font-family:Hiragino Sans,Yu Gothic,Noto Sans JP,sans-serif}*{box-sizing:border-box}body{background:linear-gradient(#3b69890e 1px, transparent 1px), linear-gradient(90deg, #3b69890e 1px, transparent 1px), var(--mist);background-size:32px 32px;min-width:320px;min-height:100vh;margin:0}button,input,svg{-webkit-tap-highlight-color:transparent}button,input{color:var(--ink);font:inherit}button:focus-visible,input:focus-visible,.clock:focus-visible{outline:4px solid color-mix(in srgb, var(--focus) 75%, transparent);outline-offset:3px}button{cursor:pointer}button:disabled{cursor:default;opacity:.72}.sr-only{clip:rect(0, 0, 0, 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strong{font-size:.94rem}.progress-trail{align-items:center;gap:12px;display:flex}.progress-label{color:var(--muted);font-size:.72rem;font-weight:700}.result-marks{gap:5px;display:flex}.result-marks i{color:#fff;background:#fff;border:2px solid #c6d3dc;border-radius:50%;place-items:center;width:20px;height:20px;font-size:.7rem;font-style:normal;font-weight:900;display:grid}.result-marks .result-correct{border-color:var(--success);background:var(--success)}.result-marks .result-retry{background:#d79b48;border-color:#d79b48}.question-heading{text-align:center;padding:19px 24px 3px}.question-heading p{color:var(--muted);margin:0;font-size:.88rem;font-weight:700}.question-heading h2{letter-spacing:.03em;margin:7px 0 0;font-family:Hiragino Maru Gothic ProN,Yu Gothic,sans-serif;font-size:clamp(1.55rem,4vw,2.35rem)}.lesson-body{grid-template-columns:minmax(0,1fr) minmax(290px,360px);place-items:center;gap:clamp(8px,2vw,28px);padding:0 clamp(16px,2.5vw,30px) 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