:root{font-family:"Yu Gothic UI","Hiragino Kaku Gothic ProN","Meiryo",system-ui,sans-serif;color:#182337;background:#f5f7fb;font-synthesis:none;--blue:#174bcb;--muted:#617087;--line:#dce3ee;--green:#137250;--red:#a43b47}*{box-sizing:border-box}body{margin:0}button,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,select:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #7fa1f3;outline-offset:4px}a{color:var(--blue)}.skip{position:absolute;top:-100px;background:white;padding:16px;z-index:5}.skip:focus{top:4px}.topbar{max-width:1100px;margin:auto;padding:26px 32px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;align-items:center;gap:12px}.mark{width:40px;height:40px;background:var(--blue);color:white;display:grid;place-content:center;border-radius:12px;font-size:24px;font-weight:800;position:relative;padding-right:5px}.mark span{position:absolute;right:8px;top:13px;font-size:17px}.brand-title{display:block;font-size:16px;font-weight:650}.brand-title b{font-size:12px;background:#e7edf9;color:#355088;padding:3px 6px;border-radius:4px;margin-left:6px}.brand-sub{font-size:13px;color:var(--muted)}.sound{background:white;border:1px solid var(--line);border-radius:100px;padding:10px 15px;color:var(--muted);font-size:14px;min-height:44px}.sound[aria-pressed=true]{color:var(--blue);border-color:#b3c6f4;background:#eef3ff}main{max-width:1036px;margin:32px auto 60px;min-height:65vh;outline:none}h1{font-size:clamp(26px,4vw,38px);line-height:1.45;letter-spacing:-.025em;margin:8px 0 14px}h2{font-size:21px;margin:0 0 20px}h3{font-size:17px;margin:0 0 12px}p{font-size:16px;line-height:1.85;margin:0 0 16px}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.16em;color:var(--blue)}.intro{margin-bottom:30px}.intro p{color:var(--muted)}.layout{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(270px,1fr);gap:24px;align-items:start}.panel{background:white;border:1px solid var(--line);border-radius:20px;padding:28px}.panel.primary{border-top:3px solid var(--blue)}.section-label{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:13px;margin-bottom:22px}.section-label:before{content:'';height:8px;width:8px;background:var(--blue);border-radius:2px}.filters{display:grid;gap:20px}.field label{display:block;font-size:14px;font-weight:600;margin-bottom:9px}select{width:100%;border:1px solid #cfd8e7;border-radius:10px;padding:13px 12px;background:#fff;color:#182337;font-size:16px;min-height:48px}.field-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}.available{font-size:14px;color:var(--muted);margin:22px 0 12px}.available strong{font-size:20px;color:#182337;margin:0 4px}.btn{min-height:48px;padding:13px 20px;border-radius:11px;border:1px solid var(--line);background:white;color:#273650;font-weight:600;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn.primary{background:var(--blue);border-color:var(--blue);color:white}.btn.primary:hover{background:#103cac}.btn:disabled{opacity:.45}.full{width:100%}.btn.quiet{background:transparent;border-color:transparent;color:var(--muted);font-weight:500}.btn.small{font-size:14px;min-height:44px;padding:10px 14px}.resume{padding:14px 16px;border:1px solid #c7d5f6;background:#f4f7ff;border-radius:12px;margin-bottom:20px;display:flex;align-items:center;justify-content:space-between;gap:12px}.resume p{font-size:14px;margin:0}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:24px}.stat-value{font-size:32px;font-weight:750;letter-spacing:-.03em;line-height:1.5}.stat-value small{font-size:14px;color:var(--muted);font-weight:400;margin-left:5px}.stat-label{font-size:13px;color:var(--muted)}.progress-head{display:flex;justify-content:space-between;font-size:14px;margin-bottom:9px}.progress{height:7px;background:#e9edf5;border-radius:20px;overflow:hidden}.progress>span{height:100%;background:var(--blue);display:block;border-radius:20px}.category-stat{margin-top:19px}.category-stat .progress{height:4px}.category-stat .progress-head{font-size:13px}.stats-note{font-size:12px;color:var(--muted);margin:15px 0 20px;line-height:1.7}.divider{border:none;border-top:1px solid var(--line);margin:22px 0}.round-info{font-size:13px;color:var(--muted);margin-top:18px}.mode-tag{font-size:12px;border-radius:4px;background:#eef2fa;padding:5px 8px;color:#466080}.quiz{max-width:760px;margin:auto}.quiz-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:12px}.quiz-toolbar .btn{padding-left:0}.quiz-meta{display:flex;gap:8px;flex-wrap:wrap;margin:0 0 18px;align-items:center}.quiz-number{font-size:13px;color:var(--muted);margin-left:auto}.question{font-size:21px;line-height:1.85;white-space:pre-line;font-weight:650;margin:0 0 24px}.instruction{color:var(--muted);font-size:13px;margin-bottom:12px}.options{display:grid;gap:12px}.option{width:100%;text-align:left;background:white;border:1px solid #ccd6e5;border-radius:12px;padding:17px 18px;display:flex;align-items:flex-start;gap:14px;color:#1d2a40;font-size:16px;line-height:1.75;transition:border-color .12s,background .12s,transform .12s}.option:not(:disabled):hover{background:#f4f7ff;border-color:#7499ec}.option:not(:disabled):active{transform:scale(.994)}.option-number{display:flex;align-items:center;justify-content:center;width:29px;height:29px;flex:0 0 29px;background:#f0f3f9;border-radius:8px;font-size:13px;font-weight:700;margin-top:1px}.option.correct{background:#f0faf5;border-color:#41916b;color:#17543a}.option.wrong{background:#fff4f4;border-color:#c7848b;color:#842936}.option.correct .option-number{color:white;background:#267c56}.option.wrong .option-number{color:white;background:#a14b55}.option .badge{display:block;font-size:12px;font-weight:700}.quiz-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:22px}.hint{background:#f5f7fc;padding:15px;border-radius:10px;font-size:14px;color:#536583;margin-top:16px;line-height:1.75}.feedback{border-top:1px solid var(--line);margin-top:28px;padding-top:24px;animation:reveal .18s ease-out}.result-title{font-size:23px;font-weight:750;color:var(--green);margin:0 0 12px}.result-title.wrong{color:var(--red)}.answer-title{font-size:14px;font-weight:650;margin-bottom:10px}.explanation{font-size:16px}.point{font-size:14px;background:#f5f7fc;border-radius:10px;padding:16px;line-height:1.8;margin-bottom:16px}.point strong{display:block;color:#415675;margin-bottom:5px}.source{font-size:12px;line-height:1.8;margin:12px 0;overflow-wrap:anywhere}.feedback details{margin:20px 0}.feedback summary{font-size:14px;font-weight:650;cursor:pointer;padding:12px 0}.choice-explanation{border-top:1px solid #e6ebf2;padding:13px 0;font-size:14px;line-height:1.8}.choice-explanation b{display:block;margin-bottom:4px}.empty{text-align:center;padding:45px 20px}.empty p{color:var(--muted)}.empty .btn{margin:5px}.finish-icon{width:56px;height:56px;border:2px solid #b9d3fc;background:#eef4ff;color:var(--blue);border-radius:50%;display:grid;place-items:center;font-size:26px;margin:0 auto 20px}.notice{max-width:1036px;margin:10px auto;background:#fff4d8;border:1px solid #e8c875;padding:12px 16px;border-radius:8px;font-size:14px;line-height:1.7}.loading{text-align:center;padding:80px 15px;color:var(--muted)}footer{max-width:1036px;margin:0 auto;padding:24px 0 30px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:12px;color:var(--muted)}footer button{border:0;background:none;color:var(--muted);text-decoration:underline;font-size:12px;min-height:44px}dialog{max-width:560px;width:calc(100% - 32px);border:1px solid var(--line);border-radius:18px;padding:28px;max-height:85vh;overflow:auto;color:#1d2a40}dialog::backdrop{background:#14234177}.dialog-head{display:flex;align-items:start;justify-content:space-between;gap:15px}.dialog-head button{border:none;border-radius:8px;min-width:44px;min-height:44px;background:#f0f3f8;font-size:24px}dialog p{font-size:14px}dialog h3{margin-top:22px}.study-tip{margin-top:22px;font-size:13px;color:var(--muted);line-height:1.8}.button-stack{display:grid;gap:10px;margin-top:20px}.complete-banner{margin-bottom:20px;color:var(--green);font-size:14px} @keyframes reveal{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@media(max-width:1100px){main,footer,.notice{margin-left:28px;margin-right:28px}}@media(max-width:700px){.topbar{padding:18px 20px}main{margin:18px 20px 40px}.layout{grid-template-columns:1fr;gap:18px}.intro{margin-bottom:22px}.intro p{font-size:14px}.panel{padding:22px;border-radius:16px}.question{font-size:18px;line-height:1.9}.option{padding:15px 13px;gap:10px}.quiz-meta{gap:6px}.quiz-number{font-size:12px}.quiz-toolbar{margin-bottom:12px}.field-row{gap:12px}.quiz-actions{flex-wrap:wrap}.quiz-actions .primary{flex:1;min-width:160px}.brand-title{font-size:14px}.brand-sub{font-size:12px}.brand-title b{font-size:11px}.sound{font-size:13px}.stat-grid{gap:16px}.stats-note{font-size:12px}footer{margin:0 20px;align-items:start;flex-direction:column;gap:0}.notice{margin:8px 20px}.resume{align-items:start;flex-direction:column}.resume .btn{width:100%}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}@media(max-width:360px){main{margin-left:12px;margin-right:12px}.panel{padding:17px}.topbar{padding:16px 12px}}
.btn.restart{margin-top:10px;font-weight:500;color:var(--muted)}