:root{--bg:#faf7f2;--card:#fff;--border:#e8e0d4;--accent:#8b4527;--soft:#faf0e8;--text:#2c1810;--muted:#786d7d;--green:#168044;--red:#bb3030;--shadow:0 2px 12px rgba(44,24,16,.08)}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:'Zen Maru Gothic',sans-serif;line-height:1.7}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--accent);text-underline-offset:3px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:3px}[hidden]{display:none!important}.home-nav{background:#21192f;padding:8px 16px;display:flex;justify-content:space-between;gap:12px}.home-nav a{color:#f2eafb;text-decoration:none;font-size:13px;font-weight:700}.social-nav{display:flex;gap:6px;flex-wrap:wrap;justify-content:center;padding:10px 16px;background:rgba(0,0,0,.06)}.social-nav a{padding:6px 14px;border-radius:16px;background:#fff;border:1px solid var(--border);color:var(--muted);font-size:12px;font-weight:700;text-decoration:none}.social-nav a[aria-current]{background:var(--accent);color:#fff}.container{max-width:640px;margin:auto;padding:20px 16px 40px}header{text-align:center;padding:12px 0 24px}h1{font-size:24px;font-weight:900;color:var(--accent)}header p{font-size:13px;color:var(--muted);margin:6px 0 10px}.textbook-entry{font-size:13px;font-weight:700}.card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:28px;box-shadow:var(--shadow)}#setup h2{font-size:14px;color:var(--muted);margin:0 0 14px}button{border:2px solid var(--border);background:var(--soft);color:var(--text);font-weight:700;border-radius:12px;padding:12px;font-size:13px}.active{border-color:var(--accent);color:var(--accent)}.search{display:flex;gap:8px;margin-bottom:20px}.search input{min-width:0;flex:1;border:2px solid var(--border);border-radius:10px;padding:12px;font-size:14px}.search button,.primary{background:var(--accent);color:#fff;border:0}.mode-buttons{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:16px}.mode-buttons button{padding:10px 6px}label{display:block;font-size:12px;color:var(--muted);margin:10px 0 6px}select{width:100%;min-width:0;border:2px solid var(--border);border-radius:10px;padding:12px;background:#fff;font-size:13px;color:var(--text)}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.topic-grid button{padding:12px 6px;overflow-wrap:anywhere}.scope{margin:14px 0 20px;font-size:12px;color:var(--muted)}.count-buttons{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:20px}.count-buttons button{flex:1;min-width:68px;padding:10px}.start{font-size:17px;font-weight:900;padding:16px;width:100%;margin-bottom:14px}.weak{width:100%;background:var(--red);color:white;border:0;margin:0 0 14px;padding:14px}.total{text-align:center;font-size:12px;color:var(--muted)}.study-note{font-size:12px;color:var(--muted);margin-top:20px;line-height:1.8}.quiz-bar{display:flex;justify-content:space-between;font-size:13px;color:var(--muted);margin-bottom:12px}.progress{height:6px;background:var(--border);border-radius:3px;overflow:hidden;margin-bottom:20px}#progress-fill{height:100%;width:0;background:var(--accent)}.muted{font-size:12px;color:var(--muted)}#question{font-size:18px;line-height:1.7;margin:12px 0 24px;font-weight:700}.choice{width:100%;display:flex;align-items:center;gap:12px;text-align:left;border:2px solid var(--border);background:#fff;padding:14px 16px;margin-bottom:10px;font-weight:400;font-size:14px}.choice .mark{flex-shrink:0;width:28px;height:28px;display:flex;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:50%;font-weight:700;font-size:12px}.choice:enabled:hover{border-color:var(--accent);background:var(--soft)}.choice.correct{background:#dcfce7;border-color:var(--green);color:var(--green)}.choice.wrong{background:#fee2e2;border-color:var(--red);color:var(--red)}.choice:disabled{cursor:default}.explanation{background:var(--soft);border:1px solid var(--border);border-radius:12px;padding:16px;margin:16px 0;font-size:13px;line-height:1.9;overflow-wrap:anywhere}.explanation h3{font-size:15px;margin-bottom:10px}#explanation-text{white-space:pre-line}.chapter-link{display:inline-block;margin-top:14px;font-size:13px;font-weight:700}.explanation ul{padding-left:18px;font-size:12px}details{margin-top:18px}summary{cursor:pointer;font-size:13px;font-weight:700}#quiz .primary,#quiz .secondary{width:100%;margin-top:12px}.primary,.secondary{padding:14px;font-size:15px}.secondary{background:#fff;border:1px solid var(--border)}.result{text-align:center}.result h2{font-size:22px}#result-ring{width:120px;height:120px;border:6px solid var(--accent);border-radius:50%;background:var(--soft);margin:20px auto;display:flex;align-items:center;justify-content:center;font-size:32px;font-weight:900;color:var(--accent)}#result-summary{font-size:14px;color:var(--muted)}.result-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin:24px 0}.result-grid>div{background:var(--soft);border:1px solid var(--border);border-radius:12px;padding:14px}.result-grid strong{display:block;font-size:24px;color:var(--accent)}.result-grid span{font-size:11px;color:var(--muted)}.result-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px}.review-item{text-align:left;border-top:1px solid var(--border);padding:16px 0;font-size:13px}.review-item p{margin:8px 0}.review-item .ex{white-space:pre-line}.search-hit{border:1px solid var(--border);border-radius:10px;padding:12px;margin:10px 0;font-size:12px}.search-hit p{margin-top:8px;white-space:pre-line}.search-count{font-size:12px;color:var(--muted);margin:12px 0}#search-results{margin-bottom:20px}#search-results .primary{width:100%;margin:10px 0}.search-clear{width:100%;font-size:12px}footer{text-align:center;color:var(--muted);font-size:11px;margin-top:32px}@media(max-width:480px){.card{padding:24px}.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.topic-grid button{font-size:12px}#question{font-size:16px}.count-buttons button{min-width:64px}.result-grid>div{padding:12px 6px}.home-nav a{font-size:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.domain-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-bottom:20px}.period-buttons{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-bottom:20px}.type-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.domain-buttons button,.period-buttons button,.type-buttons button{padding:12px 6px}.related{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;font-size:12px}.timeline-item{padding:12px 0;border-bottom:1px solid var(--border);font-size:12px}.timeline-item strong{display:block;color:var(--accent)}.timeline-item p{margin-top:8px}.related-event{margin:12px 0;white-space:pre-line;font-size:12px}.result .chapter-link{margin-left:8px;margin-right:8px}

.topic-grid{margin-bottom:20px}.choice>span:last-child{min-width:0;overflow-wrap:anywhere}.person-date{color:var(--muted);font-size:12px}#references .chapter-link{font-size:12px}

#question{white-space:pre-line}