:root{color-scheme:dark;--bg:#121a28;--panel:#1b2638;--border:#34465f;--text:#eef3fb;--muted:#acbcd3;--accent:#a9d8ff;--green:#a2efbc;--red:#ffb5b5;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
*{box-sizing:border-box}body{margin:0}header,main,footer,#notice{max-width:1100px;margin:auto;padding:16px 24px}header{display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--border)}header strong{font-size:21px}header span{margin-left:18px;color:var(--muted);font-size:13px}button,select{font:inherit;color:inherit;background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:10px 14px}button{cursor:pointer;touch-action:manipulation}button:disabled{cursor:default}button:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid var(--accent);outline-offset:2px}.toolbar{display:flex;align-items:start;gap:12px;margin-bottom:16px}.toolbar details{flex:1}summary{cursor:pointer;padding:10px;min-height:44px}.settings-grid{background:var(--panel);padding:16px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;border:1px solid var(--border);border-radius:8px}.settings-grid label{display:grid;gap:6px;font-size:13px}.settings-grid label.check{display:flex;align-items:center}.settings-grid p{grid-column:1/-1;color:var(--muted);font-size:12px;margin:0}.metrics{display:flex;flex-wrap:wrap;gap:10px 24px;font-size:13px;font-variant-numeric:tabular-nums}.metrics b{font-size:19px}.metrics #saved{margin-left:auto;color:var(--muted);font-size:12px}.question-meta{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:20px;min-height:32px;font-size:12px;color:var(--muted)}#word{font-size:22px;color:var(--text)}#reason{margin-left:auto}.sentence-area{min-height:150px;position:relative;display:flex;align-items:center;padding:12px 0}#sentence{font-size:clamp(23px,3.5vw,34px);line-height:1.45;margin:0;overflow-wrap:break-word}mark{background:transparent;color:var(--accent);font-weight:700;border-bottom:2px solid var(--accent)}#paused-label{position:absolute;right:0;bottom:0;font-size:12px;color:var(--accent)}.feedback{min-height:100px;padding:12px 16px;border:1px solid var(--border);border-radius:8px;background:var(--panel);margin:4px 0 14px}.feedback strong{font-size:17px}.feedback p{font-size:14px;line-height:1.4;min-height:20px;margin:5px 0}.feedback small{font-size:12px;color:var(--muted)}.feedback.correct{border-color:var(--green)}.feedback.correct strong{color:var(--green)}.feedback.incorrect{border-color:var(--red)}.feedback.incorrect strong{color:var(--red)}.choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}.choice{min-height:62px;text-align:left;display:grid;grid-template-columns:26px minmax(0,1fr);align-items:center;gap:2px 8px;padding:8px 10px;position:relative}.choice kbd{grid-row:1/3;color:var(--accent);font:700 17px ui-monospace,monospace}.choice span{font-size:16px;overflow-wrap:anywhere}.choice small{color:var(--muted);font-size:11px}.choice.selected{box-shadow:inset 0 0 0 1px var(--accent)}.choice.correct{background:#213e32;border-color:var(--green)}.choice.incorrect{background:#462c32;border-color:var(--red)}.paused .sentence-area{opacity:.6}#next{margin-top:12px}.hint,footer,#notice{font-size:12px;line-height:1.6;color:var(--muted)}#notice:empty{padding:0}#notice:not(:empty){color:var(--red)}#source{font-size:13px;color:var(--muted);border-top:1px solid var(--border)}#source p{padding:0 10px;line-height:1.6}main:focus{outline:none}.statistics h1{font-size:24px}.statistics>p{color:var(--muted);line-height:1.7}.statistics>button{margin:0 8px 12px 0}.table-scroll{overflow:auto}table{width:100%;border-collapse:collapse;font-size:13px;font-variant-numeric:tabular-nums}th,td{padding:10px;text-align:left;border-bottom:1px solid var(--border);white-space:nowrap}th span{display:block;font-weight:400;color:var(--muted);font-size:12px}thead{background:var(--panel)}[hidden]{display:none!important}@media(min-width:1000px){.choices:has(.choice:nth-child(10)){grid-template-columns:repeat(4,minmax(0,1fr))}}@media(max-width:640px){header,main,footer,#notice{padding:12px 14px}header span{display:none}.toolbar{margin-bottom:12px}.question-meta{margin-top:12px}.sentence-area{min-height:132px}.feedback{min-height:104px;margin-bottom:10px;padding:10px 12px}.choices{grid-template-columns:repeat(2,minmax(0,1fr));gap:6px}.choice{min-height:56px;padding:7px 8px;column-gap:3px}.choice span{font-size:14px}.choice small{font-size:10px}.metrics{gap:8px 12px}.metrics b{font-size:17px}.settings-grid{padding:12px}.hint{margin:10px 0}.question-meta #reason{font-size:11px}#count{font-size:11px}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto}} 
#unknown{width:100%;min-height:48px;margin-top:10px;color:var(--muted)}#unknown small{margin-left:12px;font-size:12px}
#next{width:100%;min-height:48px;margin-top:10px;border-color:var(--accent)}#next small{margin-left:12px;font-size:12px;color:var(--muted)}.feedback.advance-ready{cursor:pointer}
header nav{display:flex;gap:8px;flex-shrink:0}header nav [aria-pressed=true]{border-color:var(--accent);color:var(--accent)}
.management h1{font-size:24px;margin:0}.management-heading{display:flex;align-items:start;justify-content:space-between;gap:16px;margin:8px 0 20px}.management-heading p{font-size:13px;color:var(--muted);line-height:1.7;margin:8px 0 0}.management-heading>button{flex-shrink:0}
.manage-filters{display:grid;grid-template-columns:minmax(200px,2fr) minmax(160px,1fr) minmax(160px,1fr);gap:12px}.manage-filters label{display:grid;gap:6px;font-size:13px}.manage-filters input{min-width:0;width:100%;font:inherit;color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:8px;padding:12px;min-height:44px}.manage-filters input:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.manage-selection{padding:14px 0;border-bottom:1px solid var(--border)}.manage-selection strong{font-size:14px}.manage-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px}.manage-actions button{font-size:13px;min-height:44px}.manage-selection .hint{margin-bottom:0}.manage-result-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:14px 0}.manage-result-heading>p{font-size:13px;color:var(--muted);margin:0}.manage-pages{display:flex;align-items:center;gap:10px;white-space:nowrap;font-size:13px}.manage-pages button{min-height:44px}
.manage-list{display:grid;gap:10px}.manage-word{border:1px solid var(--border);border-radius:8px;background:var(--panel);padding:14px}.manage-word-title{display:flex;align-items:center;gap:10px;min-height:40px}.manage-word-title input{width:22px;height:22px;margin:0;accent-color:var(--accent);cursor:pointer;outline-offset:4px}.selection-spacer{width:22px;flex-shrink:0}.word-link{border:0;background:transparent;padding:6px 0;font-size:19px;font-weight:700;text-align:left;color:var(--accent);overflow-wrap:anywhere}.word-status{font-size:12px;color:var(--green);margin-left:auto;white-space:nowrap}.muted-status{color:var(--muted)}.manage-meaning{margin:4px 0 12px 32px;font-size:14px;line-height:1.6;overflow-wrap:anywhere}.manage-word-bottom{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-left:32px}.manage-word-bottom>span{font-size:12px;color:var(--muted);line-height:1.6}.manage-word-bottom>div{display:flex;gap:8px;flex-shrink:0}.manage-word-bottom button{font-size:13px;min-height:44px}.manage-empty,.empty-study{padding:24px 0;line-height:1.7;color:var(--muted)}.empty-study h1{font-size:23px;color:var(--text)}
#word-detail{color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:12px;width:min(760px,calc(100% - 28px));max-height:calc(100dvh - 32px);padding:22px;overflow:auto}#word-detail::backdrop{background:#000a}.detail-heading{display:flex;justify-content:space-between;align-items:start;gap:12px}.detail-heading h2{font-size:25px;margin:0 0 6px;overflow-wrap:anywhere}.detail-heading .word-status{color:var(--muted)}.original-meaning,.exclusion-reason{font-size:14px;line-height:1.8;overflow-wrap:anywhere}.original-meaning b,.exclusion-reason b{font-size:12px;color:var(--muted)}.detail-tools{display:flex;flex-wrap:wrap;align-items:center;gap:12px}.detail-tools span{font-size:12px;color:var(--muted);line-height:1.6}.sense-detail{padding:12px 0;border-top:1px solid var(--border);margin-top:16px}.sense-detail h3{font-size:17px;margin:0}.sense-detail h3 small{font-size:12px;font-weight:400;color:var(--muted)}.example-detail{background:var(--panel);padding:10px 14px;border-radius:8px;margin:10px 0}.example-detail p{font-size:14px;line-height:1.7;margin:3px 0;overflow-wrap:anywhere}.example-detail p[lang=en]{font-size:17px}
@media(max-width:640px){header{gap:10px}header strong{font-size:18px}header nav button{padding:9px 10px;font-size:13px;min-height:44px}.management-heading{display:block}.management-heading>button{margin-top:12px}.manage-filters{grid-template-columns:repeat(2,minmax(0,1fr))}.manage-search{grid-column:1/-1}.manage-result-heading{flex-wrap:wrap}.manage-word{padding:10px}.manage-word-title{gap:8px}.word-link{font-size:18px}.word-status{font-size:11px}.manage-meaning{margin-left:0}.manage-word-bottom{margin-left:0;display:block}.manage-word-bottom>div{margin-top:8px}.manage-word-bottom button{flex:1}.manage-pages{gap:8px}#word-detail{padding:16px}.detail-heading h2{font-size:23px}}
#word-editor{color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:12px;width:min(760px,calc(100% - 28px));max-height:calc(100dvh - 32px);padding:20px;overflow:auto}#word-editor::backdrop{background:#000a}#word-editor h2{font-size:23px;margin:0;overflow-wrap:anywhere}#word-editor label{display:flex;flex-direction:column;gap:6px;font-size:13px;min-width:0}#word-editor input,#word-editor textarea{color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:6px;padding:10px;width:100%;font:inherit;font-size:16px;line-height:1.6;box-sizing:border-box}#word-editor textarea{resize:vertical}.edit-sense{border-top:1px solid var(--border);margin-top:18px;padding-top:12px}.edit-sense h3{font-size:17px;margin:0 0 12px}.edit-labels{display:grid;grid-template-columns:minmax(0,3fr) minmax(0,1fr);gap:12px}.edit-example{margin-top:12px;display:grid;gap:10px}.edit-example h4{font-size:13px;color:var(--muted);margin:0}.edit-actions{position:sticky;bottom:-20px;display:flex;flex-wrap:wrap;gap:8px;background:var(--bg);border-top:1px solid var(--border);padding:12px 0}.edit-actions button{min-height:44px}#edit-error{color:#ffb8b8;line-height:1.6;overflow-wrap:anywhere}#edit-word{min-height:44px}@media(max-width:640px){#word-editor{padding:14px}.edit-labels{grid-template-columns:minmax(0,2fr) minmax(0,1fr)}.edit-actions{bottom:-14px}.edit-actions button:first-child{flex:1 0 100%}}
#word-editor .detail-heading>button{flex-shrink:0;white-space:nowrap}
.toolbar details{min-width:0}.settings-grid label{min-width:0}.settings-grid select{width:100%;min-width:0;max-width:100%;min-height:44px}.settings-grid label.check{grid-column:1/-1;gap:8px}.settings-grid label.check input{flex:0 0 auto;width:20px;height:20px;margin:0}
#word-editor{height:min(850px,calc(100dvh - 32px));padding:0;overflow:hidden}#edit-form{height:100%;display:flex;flex-direction:column;min-height:0}#word-editor .detail-heading{padding:16px 18px 10px;flex-shrink:0;border-bottom:1px solid var(--border)}#word-editor .detail-heading .hint{margin-bottom:0}.edit-scroll{flex:1;min-height:0;overflow:auto;padding:0 18px 14px;overscroll-behavior:contain}.edit-footer{flex-shrink:0;padding:10px 18px 12px;border-top:1px solid var(--border)}.edit-actions{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));padding:0;border:0;gap:8px}.edit-actions #edit-save,.edit-actions [data-edit=exclude]{grid-column:1/-1}.edit-actions button{min-width:0;overflow-wrap:anywhere}.edit-actions [data-edit=exclude]{color:var(--red);border-color:#80545a}.edit-exclude-hint{margin:8px 0 0}#edit-error:empty{display:none}#edit-error{margin:0 0 8px}
@media(max-width:640px){.toolbar:has(#settings[open]){flex-wrap:wrap}.toolbar #settings[open]{flex:1 0 100%;width:100%}.settings-grid{grid-template-columns:minmax(0,1fr)}#word-editor{padding:0}#word-editor .detail-heading{padding:12px 14px 10px}.edit-scroll{padding:0 14px 12px}.edit-footer{padding:10px 14px 12px}}
.edit-actions #edit-save{border-color:var(--accent);color:var(--accent)}.edit-actions button:disabled{opacity:.55}