:root{--bg:#f7f7f5;--card:#fff;--ink:#1f2328;--sub:#646b73;--accent:#2f6f4f;--accent-w:#e8f1ec;--line:#e3e3e0;--ok:#1f7a4d;--ng:#b4452f}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;color:var(--ink);background:var(--bg);line-height:1.7}
a{color:var(--accent)}
.site-header{display:flex;flex-wrap:wrap;gap:.5rem 1rem;align-items:center;justify-content:space-between;padding:.8rem 1.1rem;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
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.site-header nav a{margin-left:1rem;text-decoration:none;color:var(--sub);font-size:.95rem}
.site-header nav a.active{color:var(--accent);font-weight:700}
main{max-width:720px;margin:0 auto;padding:1.2rem 1rem 3rem}
.hero h1{margin:.2rem 0;font-size:1.5rem}
.tagline{color:var(--sub);margin:.2rem 0}
.date{color:var(--accent);font-weight:700}
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.q-text{font-weight:600;margin:.3rem 0 .8rem}
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.choice:hover{border-color:var(--accent)}
.choice .mark{color:var(--sub);font-weight:700}
.choice.correct{border-color:var(--ok);background:#eef8f1}
.choice.wrong{border-color:var(--ng);background:#fbeeeb}
.choice.locked{pointer-events:none}
.choice.locked:not(.correct):not(.wrong){opacity:.55}
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.verdict.ok{color:#0e5a36}.verdict.ok::before{content:"○";background:#1f7a4d}
.verdict.ng{color:#8c2f1e}.verdict.ng::before{content:"×";background:#c43d6a}
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.q.is-wrong .exp-text{background:#fce8ee;border-left:4px solid #c43d6a}
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.score-line strong{font-size:1.4rem;color:var(--accent)}
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.info{border-collapse:collapse;width:100%;margin:1rem 0}
.info th,.info td{border:1px solid var(--line);padding:.6rem .8rem;text-align:left;vertical-align:top}
.info th{background:var(--accent-w);width:8rem;white-space:nowrap}
.site-footer{border-top:1px solid var(--line);background:var(--card);padding:1.4rem 1rem;margin-top:2rem}
.site-footer nav{display:flex;gap:1rem;flex-wrap:wrap;justify-content:center;margin-bottom:.8rem}
.site-footer nav a{font-size:.9rem;color:var(--sub)}
.disclaimer{max-width:720px;margin:0 auto;color:var(--sub);font-size:.8rem;text-align:center}
.copyright{text-align:center;color:var(--sub);font-size:.8rem;margin:.6rem 0 0}