:root{color-scheme:light;--paper:#fffdf8;--ink:#263d34;--edge:#dce5dd;--accent:#24685c;--muted:#627369}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font-family:"BIZ UDPGothic",system-ui,sans-serif;line-height:1.9}a{color:var(--accent);text-underline-offset:3px}button{font:inherit;cursor:pointer}header,footer{border-bottom:1px solid var(--edge);padding:18px max(20px,calc((100% - 980px)/2))}header{display:flex;align-items:center;justify-content:space-between;gap:16px;background:#f0f5ec}header>a{font-size:22px;font-weight:800;text-decoration:none}header span{font-size:13px}main{max-width:940px;margin:36px auto 60px;padding:0 22px}h1{font-size:clamp(23px,4vw,32px);line-height:1.5}h2{font-size:20px}.question-card{padding:clamp(18px,4vw,36px);border:1px solid var(--edge);border-radius:20px;background:white}.question-stem{margin:24px 0;font-size:17px}.question-stem p{margin:1em 0}.question-stem img,.choices img,.explanation img{max-width:100%;height:auto}table{border-collapse:collapse;max-width:100%;font-size:15px}td,th{padding:6px 10px;border:1px solid #829c8d}figure,.img_margin{margin:18px 0;overflow:auto}.choices{display:grid;gap:12px;margin:24px 0;padding:0;list-style:none}.choices button{display:flex;align-items:flex-start;gap:14px;width:100%;text-align:left;background:#fff;border:1px solid #cbd8cf;border-radius:12px;padding:15px 18px;color:var(--ink)}.choice-label{font-weight:700;color:var(--accent)}.choices button:hover{background:#f1f7ee}.choices button:focus-visible,a:focus-visible{outline:3px solid #148e7f;outline-offset:3px}.choices button.is-correct{border:2px solid #24685c;background:#e3f2ef}.choices button.is-picked:not(.is-correct){border:2px solid #ba5959;background:#fff1ee}.choices button:disabled{cursor:default;opacity:1}details{border-top:1px solid var(--edge);padding-top:18px}summary{font-weight:700;cursor:pointer}#kaisetsu{padding:12px 0}.question-source{font-size:13px;color:var(--muted);line-height:1.7}.question-tools,.question-navigation{display:flex;gap:14px;flex-wrap:wrap;margin-top:24px;align-items:center}.question-tools button,.question-navigation a{padding:9px 14px;border:1px solid var(--edge);border-radius:10px;background:#fff;color:var(--accent);text-decoration:none}.question-result{font-weight:700;min-height:1.9em}.question-index{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;list-style:none;padding:0}.question-index a{display:block;border:1px solid var(--edge);padding:12px;border-radius:10px;text-decoration:none}.question-index a:hover{background:#e3f2ef}footer{border-top:1px solid var(--edge);font-size:13px}.select-table{overflow:auto}.select-table button{display:none}@media(max-width:600px){main{margin-top:22px;padding:0 14px}header{padding:14px}header>a{font-size:20px}.question-card{border-radius:14px}.question-stem{font-size:16px}td,th{padding:4px 7px}}
.question-stem{overflow-x:auto}.choices li,.choices button>span:last-child{min-width:0}.choices button>span:last-child{overflow-x:auto}