.snDialog{width:min(1120px,94vw);max-width:1120px;max-height:92dvh;box-sizing:border-box;border:1px solid #dbe3eb;border-radius:22px;padding:28px;color:#24354b;background:#fff;overflow:auto;box-shadow:0 24px 100px #152b4650}.snDialog::backdrop{background:#182e4a80;backdrop-filter:blur(4px)}
.snHeader{display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid #e5eaf0;padding-bottom:20px}.snHeader h2{margin:4px 0 0;font-size:25px}.snEyebrow{font-size:12px;font-weight:700;letter-spacing:.08em;color:#56718c;margin:0 0 7px}.snClose,.sentenceNavigator button,.snStatus+div>button{font-family:inherit;cursor:pointer}.snClose{border:1px solid #cbd7e2;background:white;border-radius:10px;padding:9px 15px;color:#354b63}.snStatus:empty{display:none}.sentenceNavigator{font-family:system-ui,-apple-system,'Hiragino Kaku Gothic ProN','Noto Sans JP',sans-serif;text-align:left}.snIntro{font-size:14px;color:#52647a;line-height:1.9;margin:20px 0}.snLevels{display:flex;gap:7px;padding:5px;background:#eff3f7;border-radius:13px;width:fit-content}.snLevels button{border:0;border-radius:9px;padding:10px 18px;color:#576b80;background:transparent;font-size:14px;font-weight:650}.snLevels button.selected{background:#fff;color:#254f82;box-shadow:0 2px 5px #193a6215}.snScroll{overflow-x:auto;background:linear-gradient(#fbfcfe,#f5f8fb);border:1px solid #e3e9ef;border-radius:16px;margin-top:22px;padding:14px 12px 8px}.snCanvas{width:max-content;min-width:100%;}.snArrows{display:block;width:100%;overflow:visible;font-family:inherit;font-size:11px;font-weight:600}.snWords{display:flex;align-items:flex-start;justify-content:space-evenly;gap:2px;padding-bottom:8px}.sentenceNavigator .snWord{font-family:Georgia,serif;position:relative;font-size:20px;border:1px solid transparent;background:transparent;color:#b4beca;border-radius:8px;padding:9px 6px 6px;min-width:32px;white-space:nowrap;box-shadow:none}.sentenceNavigator .snWord.colored{color:var(--sn-color);background:color-mix(in srgb,var(--sn-color) 7%,white);border-bottom:3px solid var(--sn-color)}.snWord.chosen,.snWord.target{outline:2px solid var(--sn-color);outline-offset:-2px}.snWord.target{background:color-mix(in srgb,var(--sn-color) 15%,white)!important}.snPos{display:block;min-height:15px;font-family:system-ui,sans-serif;font-size:10px;color:#52647a;margin-top:7px}.snScrollHint{font-size:11px;color:#63748a;margin:10px 0 15px}.snLegend{display:flex;gap:18px;flex-wrap:wrap;font-size:12px;color:#51677f}.snLegend span:before{content:'';display:inline-block;width:8px;height:8px;background:var(--sn-color);border-radius:50%;margin-right:6px}.snDetail{background:#f0f5fb;border-left:3px solid #3c76bb;border-radius:0 13px 13px 0;padding:20px 24px;min-height:135px;box-sizing:border-box}.snDetail h3{font-size:18px;margin:6px 0 12px}.snDetail p{font-size:14px;line-height:1.95;margin:7px 0}.snDetail .snEyebrow{font-size:11px}.snExtra{color:#506780}.snCaution{padding:14px;background:#fff8e8;border-radius:10px;font-size:13px;line-height:1.9}.snFoot{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:20px;color:#65758a}.snFoot small{font-size:11px;line-height:1.7}.snFoot button{white-space:nowrap;background:transparent;border:0;text-decoration:underline;color:#526d8d;padding:10px}.sentenceNavigator button:focus-visible,.snClose:focus-visible,.snScroll:focus-visible{outline:3px solid #2c69af;outline-offset:3px}.sentenceNavigator button:hover{filter:brightness(.96)}
@media(max-width:600px){.snDialog{padding:17px;width:96vw;border-radius:16px}.snHeader h2{font-size:21px}.snIntro{font-size:13px}.snLevels{width:100%;box-sizing:border-box;gap:2px}.snLevels button{flex:1;font-size:12px;padding:10px 5px;white-space:nowrap}.snDetail{padding:17px}.snFoot{align-items:flex-start}.snWords{justify-content:flex-start}.snScroll{margin-top:16px}}

.snOriginal{display:none}@media(max-width:600px){.snOriginal{display:block;font-family:Georgia,serif;font-size:19px;line-height:1.7;margin:20px 0 4px;color:#2f425b}}

.sentenceNavigator .snWord{font-weight:400}

.snCanvas{padding:0;box-sizing:border-box}.snWords{gap:8px;padding:2px 0}.sentenceNavigator .snWord{min-width:50px;padding:9px 5px 5px;border-bottom:0!important;border-radius:4px}.snArrows{font-size:11px}.snBracket{cursor:pointer;outline:none}.snBracketLabel{paint-order:stroke;stroke:#f8fafc;stroke-width:5px;stroke-linejoin:round;pointer-events:all}.snBracket:focus-visible .snBracketLabel{fill:#174d86;stroke:#dbeaff;stroke-width:8px}.snLegend{margin-bottom:20px}.snPos{min-height:15px}.snScroll{padding:10px 10px 6px}.snWord.chosen{outline:none;background:color-mix(in srgb,var(--sn-color) 13%,white)!important}.snWord.target{outline:2px solid var(--sn-color)}

/* Responsive diagram: wrap actual words, then route relations in row margins. */
.snCanvas{position:relative;width:100%;max-width:75vw;min-width:0;margin:0 auto;padding:0}.snRows{position:relative}.snLine{position:relative}.snWords{justify-content:flex-start;align-items:stretch;gap:8px;padding:0;box-sizing:border-box}.sentenceNavigator .snWord{flex:none;min-width:0;max-width:100%;overflow-wrap:anywhere;white-space:normal}.snArrows{position:absolute;inset:0;width:100%;pointer-events:none}.snBracket{pointer-events:none}.snBracketLabel{pointer-events:all}.snScroll{overflow:visible}.snOriginal{display:none!important}.snPos{white-space:nowrap;font-size:9px}.snDialog{width:min(1200px,86vw)}
@media(max-width:700px){.snCanvas{max-width:100%}.sentenceNavigator .snWord{font-size:18px;padding:8px 3px 4px}.snWords{gap:4px}.snBracketLabel{font-size:10px}.snDialog{width:96vw;padding:16px}.snScroll{padding:8px 2px}.snPos{font-size:8px}}

.sentenceNavigator .snWord{box-sizing:border-box}

#subtitleActions{flex-wrap:wrap}
.snDialog .snHeader{position:sticky;top:-16px;background:#fff;z-index:2}

.snGuide{margin:14px 0 0;padding:12px 14px;border:1px solid #e0e7ef;border-radius:12px;background:#fafbfd}.snGuideControls{display:flex;flex-wrap:wrap;gap:7px}.snGuideControls button{border:1px solid #cbd8e6;background:white;color:#345c86;border-radius:7px;padding:8px 11px;font-size:12px}.snGuideControls button:disabled{opacity:.45;cursor:default}.snGuideStatus{font-size:12px;color:#5f748b;margin:8px 0 0}.snGuideStatus:empty{display:none}.snGuide audio{width:100%;height:34px;margin-top:10px}.snGuideControls button[hidden]{display:none}

/* Reserve the audio/status rows in every state so the diagram does not jump. */
.snGuideStatus,.snGuideStatus:empty{display:block;min-height:2.8em;line-height:1.4;margin:8px 0 0}.snGuide audio{display:block}.snGuide audio.snAudioIdle{opacity:.35;pointer-events:none;filter:grayscale(1)}

.snAttention{fill:#ffe87533;stroke:#e6b800;stroke-width:3;pointer-events:none;animation:snAttentionFade 2.4s ease-out both}@keyframes snAttentionFade{0%,45%{opacity:1}100%{opacity:0}}@media(prefers-reduced-motion:reduce){.snAttention{animation-duration:4s;animation-timing-function:step-end}}
#prepareDialog{max-width:560px;width:calc(100% - 36px);padding:24px;border:1px solid #dce4ec;border-radius:16px}#prepareDialog::backdrop{background:#162c4566;backdrop-filter:blur(4px)}#prepareDialog label{display:inline-flex;gap:10px;align-items:center;margin:10px 12px 10px 0}#prepareDialog input{width:70px}#prepareStatus{min-height:3em}

.snGuide{position:relative;padding-right:110px;min-height:150px}.snTeacherCharacter{position:absolute;right:10px;top:12px;width:86px;height:96px;pointer-events:none}.snTeacherCharacter svg{width:100%;height:100%;overflow:visible}.snOwlBody{transform-origin:55px 94px}.snOwlEyes{transform-origin:55px 53px;animation:snOwlBlink 6s infinite}.snOwlSpark{opacity:.5;transform-origin:98px 34px}.snGuide[data-state=speaking] .snOwlBody{animation:snOwlNod 2s ease-in-out infinite}.snGuide[data-state=loading] .snOwlSpark{animation:snOwlTwinkle 1.4s ease-in-out infinite}.snGuide[data-state=waiting] .snOwlSpark{opacity:1}@keyframes snOwlBlink{0%,43%,47%,100%{transform:scaleY(1)}45%{transform:scaleY(.1)}}@keyframes snOwlNod{0%,100%{transform:rotate(-2deg)}50%{transform:rotate(2deg)}}@keyframes snOwlTwinkle{50%{opacity:1;transform:scale(1.2)}}@media(max-width:600px){.snGuide{padding-right:70px}.snTeacherCharacter{width:58px;height:66px;right:5px;top:14px}}@media(prefers-reduced-motion:reduce){.snOwlBody,.snOwlEyes,.snOwlSpark{animation:none!important}}

/* Opaque label plates sit above all bracket and relationship paths. */
.snLabelBackground{fill:#fff;pointer-events:all}.snLabelControl{cursor:pointer}.snLabelLayer .snBracketLabel{pointer-events:all}

/* First-use guidance occupies the existing status row, keeping the sentence still. */
.snGuideStatus.snGuideTip{position:relative;color:#654d14;background:#fff3c4;border-radius:7px;padding:5px 8px;margin-top:8px;font-weight:600;font-size:12px;line-height:1.4}
.snGuideStatus.snGuideTip::before{content:'';position:absolute;top:-6px;left:var(--sn-tip-left,20px);border-inline:6px solid transparent;border-bottom:6px solid #fff3c4;transform:translateX(-50%)}
.snGuideControls button.snTipTarget{border-color:#c69527;box-shadow:0 0 0 3px #f6ce6266;background:#fff6d7}

.snGuideControls button.snNextReady{background:#fff2a8;border-color:#e6b800;color:#624d00;animation:snNextGlow 1.8s ease-in-out infinite}
@keyframes snNextGlow{0%,100%{box-shadow:0 0 0 2px #ffe87566}50%{box-shadow:0 0 0 5px #ffe87588,0 0 16px #e6b80055}}
@media(prefers-reduced-motion:reduce){.snGuideControls button.snNextReady{animation:none;box-shadow:0 0 0 3px #ffe87588}}

.snIntro.snLevelsTip{padding:9px 12px;border-radius:8px;background:#fff3c4;color:#654d14;font-weight:600}
.snIntro.snLevelsTip::after{content:' ↓';font-size:18px}
.snLevels.snLevelsTipTarget{border-radius:9px;outline:2px solid #e6b80088;outline-offset:4px}