:root{color-scheme:light;--ink:#193047;--green:#177e7b;--bg:#fff9ef;--line:#e4ded3}*{box-sizing:border-box}body{margin:0;background:#f1ece3;color:var(--ink);font-family:system-ui,-apple-system,"Yu Gothic",sans-serif;line-height:1.7}button,input,select{font:inherit;color:inherit}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:default;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #de9a37;outline-offset:3px}[hidden]{display:none!important}#app,#install-landing{max-width:760px;margin:20px auto;padding:24px;background:var(--bg);border-radius:24px}header,.quiz-top,.settings-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}header{margin-bottom:20px}.brand{text-decoration:none;color:inherit;font-weight:750;font-size:22px}.brand span{display:block;font-size:12px;color:#63716f}.plain{border:0;background:transparent;color:var(--green);min-height:44px;padding:8px}.icon{border:1px solid #bbd1cb;border-radius:24px;background:white;padding:8px 14px;min-height:44px}.primary,.secondary{width:100%;min-height:54px;border-radius:16px;padding:12px 18px;font-weight:650;margin-top:12px}.primary{background:var(--green);color:white;border:0}.secondary{background:white;border:1px solid var(--line)}.intro{display:flex;align-items:center;justify-content:space-between;gap:16px}.intro h1{font-size:30px;line-height:1.5}.intro p,.note{font-size:13px;color:#63716f}select,input{display:block;width:100%;padding:12px;border:1px solid var(--line);border-radius:10px;background:white;margin:8px 0 14px}#question,#complete{font-size:clamp(21px,4.7vw,28px);line-height:1.55;overflow-wrap:anywhere;margin:12px 0}#choices{display:grid;gap:10px}.choice{min-height:52px;background:white;border:1px solid var(--line);border-radius:14px;text-align:left;padding:12px 16px;font-size:19px}.choice.correct{border:2px solid #137450;background:#e5f7ed;opacity:1}.choice.wrong{border:2px solid #b54441;background:#fff0ee;opacity:1}.choice.muted{opacity:.4}#answer-panel{margin-top:14px;padding:16px;background:#f0f6ee;border-radius:16px}#answer-panel h2{font-size:20px;margin:0}#translation,#explanation{font-size:15px;line-height:1.8}#explanation{border-top:1px solid #d8e2d5;padding-top:10px}mark{background:#d2eadd;color:#135c3c;padding:0 3px}#round-result{text-align:center}.result-bird{max-width:45%;height:auto;margin:20px auto 0}#round-score{font-size:28px}.settings-heading h2{font-size:22px}details{margin-top:24px;font-size:14px}.pack-tools,.offline-tools,.backup-tools,.delete-data-tools{border-bottom:1px solid var(--line);padding:20px 0}.pack-buttons{display:grid;grid-template-columns:1fr;gap:8px}.pack-counts{margin:20px 0}.pack-counts table{width:100%;border-collapse:collapse}.pack-counts caption{text-align:left;font-weight:700}.pack-counts td,.pack-counts th{padding:8px;border-bottom:1px solid var(--line);text-align:right}.pack-counts th:first-child{text-align:left}.pack-counts p{font-size:12px;color:#63716f}progress{width:100%;accent-color:var(--green)}#offline-count,#pack-result{font-weight:700}#offline-version{font-size:11px;overflow-wrap:anywhere}.reset-button{color:#a34540}dialog{border:1px solid var(--line);border-radius:22px;background:var(--bg);max-width:480px;width:calc(100% - 32px);padding:24px}dialog::backdrop{background:#19304777}dialog h2{font-size:22px}dialog label{display:block}.notice{color:#9c4934;font-size:14px}.list-item{padding:18px 0;border-bottom:1px solid var(--line)}.list-item p{margin:8px 0}.list-item .english{font-size:18px}#install-landing>img{display:block;margin:auto}#install-landing h1{text-align:center}#install-landing small{font-size:22px}#settings-close-bottom{margin:24px 0}#offline-summary{display:block;width:100%;font-size:12px}#replay{margin:5px 0}#next{position:sticky;bottom:12px} @media(max-width:600px){body{background:var(--bg)}#app,#install-landing{padding:calc(16px + env(safe-area-inset-top)) 18px calc(20px + env(safe-area-inset-bottom));margin:0;border-radius:0}header{gap:8px}.brand{font-size:19px}.intro h1{font-size:26px}.intro img{width:100px;height:auto}.instruction{font-size:13px;margin:6px 0}.quiz-top{font-size:13px}.choice{min-height:48px;padding:9px 14px}#question,#complete{font-size:21px}#answer-panel{padding:12px}#translation,#explanation{font-size:14px}.settings-heading{scroll-margin-top:12px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}