:root{--paper:#f7f6f1;--book:#f0efe8;--surface:#fdfcf8;--ink:#272d29;--secondary:#646c65;--line:rgba(37,48,40,.12);--accent:#365b49;--accent-hover:#294637;--accent-soft:#e6ece4;--warm:#856436;--danger:#9a4538;--radius:8px;--space:4px;font:16px/1.65 -apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0}h1,h2,h3,p{margin:0}h1,h2,h3,strong{font-weight:600}h1{font-size:15px}h2{font-size:20px;line-height:1.5}h3{font-size:16px}button,input,textarea,select{font:inherit;color:inherit}button{height:34px;padding:0 12px;border:1px solid var(--line);border-radius:6px;background:transparent;font-size:13px;cursor:pointer;white-space:nowrap;font-weight:400;transition:background .15s}button:hover{background:rgba(48,65,53,.05)}button:disabled{cursor:default;opacity:.45}button.primary{background:var(--accent);color:#fafcf9;border-color:var(--accent);font-weight:600}button.primary:hover{background:var(--accent-hover)}button:focus-visible,a:focus-visible{outline:2px solid var(--accent);outline-offset:3px}input:focus-visible,select:focus-visible,textarea:focus-visible{outline:2px solid var(--accent);outline-offset:-1px}a{color:var(--accent);text-underline-offset:3px}label{display:block;font-size:13px;font-weight:600;margin-bottom:6px}textarea,input,select{width:100%;border:1px solid var(--line);background:var(--surface);border-radius:6px;padding:10px 12px}select{font-size:13px;height:40px;padding:0 10px;text-overflow:ellipsis}textarea{resize:vertical;line-height:1.65}textarea::placeholder,input::placeholder{color:#7c837c}input[type=radio]{width:16px;height:16px;accent-color:var(--accent);padding:0}.small{font-size:12px;line-height:1.65}.muted{color:var(--secondary)}.section-label{font-size:12px;color:var(--secondary);letter-spacing:.05em}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}[hidden]{display:none!important}.skip{position:fixed;z-index:10;top:-100px;left:16px;background:var(--surface);padding:8px}.skip:focus{top:8px}
.app-header{height:68px;padding:0 28px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);background:var(--surface)}.identity{display:flex;gap:16px;align-items:center}.wordmark{font-size:23px;letter-spacing:.1em;font-weight:600;color:var(--accent)}.header-divider{width:1px;height:20px;background:var(--line)}.header-actions{display:flex;gap:8px;align-items:center}.header-actions button{border:0}.connection{font-size:12px;color:var(--secondary);margin-right:12px;white-space:nowrap}.connection:before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:#ad9672;margin-right:7px;vertical-align:2px}.connection.configured:before{background:#537d5d}.workspace{height:calc(100dvh - 68px);display:grid;grid-template-columns:minmax(290px,28%) minmax(400px,1fr) minmax(280px,26%);overflow:hidden}.pane{min-width:0;min-height:0}.book-pane{background:var(--book);display:flex;flex-direction:column;border-right:1px solid var(--line)}.pane-intro{padding:24px 24px 16px}.pane-intro h2{margin-top:4px}.material-controls{padding:0 24px 16px;display:grid;gap:16px}.segments{display:flex;border-bottom:1px solid var(--line);gap:20px}.segments button{border:0;border-radius:0;padding:0 0 8px;height:34px;color:var(--secondary);position:relative}.segments button[aria-pressed=true]{color:var(--accent)}.segments button[aria-pressed=true]:after{content:"";position:absolute;height:2px;background:var(--accent);bottom:-1px;left:0;right:0}.material-controls p{margin-top:6px}.reader-bar{display:flex;align-items:center;justify-content:space-between;padding:0 24px 10px;gap:8px}.reader-bar button{font-size:12px;height:28px;padding:0 8px}.reader-scroll{overflow:auto;flex:1;padding:12px 24px 32px;border-top:1px solid var(--line);scroll-padding:36px}.reader-text{white-space:pre-wrap;overflow-wrap:anywhere;font:400 16px/1.85 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;margin:0;color:#434b44}.reader-line.focused{background:#dce8d6;box-shadow:0 0 0 3px #dce8d6}.reader-foot{padding:12px 24px;border-top:1px solid var(--line)}
.chat-pane{display:flex;flex-direction:column;background:var(--surface)}.chat-heading{display:flex;align-items:center;justify-content:space-between;padding:24px 28px 18px;gap:16px;border-bottom:1px solid var(--line)}.chat-heading h2{font-size:18px;margin-top:4px}.conversation{overflow:auto;flex:1;padding:24px 28px;scroll-behavior:smooth}.welcome{padding:28px 0 36px}.welcome .eyebrow{color:var(--accent);font-size:12px}.welcome h3{font-size:25px;line-height:1.5;margin:12px 0}.welcome p{font-size:16px;color:var(--secondary);max-width:42ch}.welcome .question-examples{margin-top:28px;display:grid;gap:12px}.question-examples button{white-space:normal;height:auto;min-height:44px;text-align:left;line-height:1.6;padding:10px 12px;background:var(--paper);border-color:transparent;font-size:14px}.welcome .local-note{font-size:12px;margin-top:24px;color:var(--secondary)}.message{margin:0 0 28px}.message-header{display:flex;align-items:center;gap:10px;margin-bottom:10px;font-size:12px;color:var(--secondary)}.message-header strong{font-size:13px;color:var(--ink)}.user-message .message-body{background:var(--book);border-radius:8px;padding:12px 16px;font-size:16px;white-space:pre-wrap;overflow-wrap:anywhere}.assistant-message.selected{border-left:2px solid #c5d2c1;padding-left:16px;margin-left:-18px}.message-body{font-size:16px;line-height:1.75;overflow-wrap:anywhere}.message-body p{margin-bottom:12px}.message-body h3{font-size:18px;margin:20px 0 8px}.message-body ul{padding-left:22px;margin:10px 0}.message-body li{margin:4px 0}.message-body blockquote{margin:12px 0;border-left:2px solid #b9c8b3;padding-left:16px;color:#525d53}.message-body pre{font-size:12px;white-space:pre-wrap;background:var(--paper);padding:12px;border-radius:6px;max-height:420px;overflow:auto}.message-body table{border-collapse:collapse;width:100%;font-size:14px;min-width:260px}.message-body th,.message-body td{text-align:left;border-bottom:1px solid var(--line);padding:8px 6px;vertical-align:top}.table-scroll{overflow:auto;margin:12px 0}.message-footer{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:12px;font-size:11px;color:var(--secondary)}.message-footer button{height:28px;font-size:12px;padding:0 8px}.cite-inline{display:inline;border:0;height:auto;padding:1px 4px;color:var(--accent);background:var(--accent-soft);font-size:12px;line-height:1.6;white-space:normal}.status-note{font-size:12px;line-height:1.7;padding:10px 12px;background:#f4eedf;color:#76552d;border-radius:6px;margin:12px 0}.pending{padding:12px 0;color:var(--secondary);font-size:14px}.pending:before{content:"";display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--accent);margin-right:10px;animation:pulse 1.5s infinite}.error-answer{font-size:14px;color:var(--danger);background:#f7eee9;padding:16px;border-radius:6px}.error-answer button{display:block;margin-top:12px}
.composer-wrap{padding:12px 28px 20px;border-top:1px solid var(--line);background:var(--surface)}#questionForm{border:1px solid rgba(50,75,53,.26);border-radius:10px;background:var(--surface);padding:12px}#questionForm:focus-within{box-shadow:0 0 0 1px var(--accent)}#question{border:0;background:transparent;padding:0;min-height:76px;max-height:200px;resize:vertical;font-size:16px;outline:none}.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:10px}.composer-bottom .primary{height:34px;min-width:108px}.composer-bottom .primary span{margin-left:8px;font-size:16px}.composer-caption{margin-top:8px}.selection-summary{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-bottom:8px;font-size:12px;color:var(--accent)}.selection-summary span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.selection-summary button{height:28px;border:0}.followups{display:flex;gap:8px;overflow:auto;padding-bottom:8px}.followups:empty{display:none}.followups button{font-size:12px;height:28px;max-width:100%;text-overflow:ellipsis;overflow:hidden}.inline-error{margin-top:8px;font-size:13px;color:var(--danger)}
.evidence-pane{background:var(--paper);border-left:1px solid var(--line);overflow:auto}.evidence-heading{padding:24px 24px 16px}.evidence-heading h2{margin-top:4px}.evidence-heading p{margin-top:8px}.evidence-list{padding:0 24px 24px}.empty-note{font-size:14px;line-height:1.9;color:var(--secondary);padding:16px 0}.evidence-item{padding:16px 0;border-top:1px solid var(--line)}.evidence-item.active{border-top-color:var(--accent)}.evidence-meta{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:11px;color:var(--secondary);margin-bottom:8px}.evidence-meta .matched{color:var(--accent)}.evidence-meta .unmatched{color:var(--danger)}.evidence-item blockquote{margin:0;font-size:15px;line-height:1.8;overflow-wrap:anywhere}.evidence-item .source-title{font-size:12px;color:var(--secondary);margin:12px 0 8px}.evidence-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.evidence-actions button,.evidence-actions a{font-size:12px;height:28px}.evidence-actions a{padding-top:2px}.feedback-section{border-top:1px solid var(--line);padding:20px 24px}.feedback-section h3{margin-bottom:16px}fieldset{border:0;padding:0;margin:0 0 16px;min-width:0}legend{font-size:12px;color:var(--secondary);padding:0;margin-bottom:8px}.radio-row{display:flex;gap:14px;flex-wrap:wrap}.radio-row label{display:inline-flex;align-items:center;gap:5px;font-size:12px;font-weight:400;margin:0;min-height:32px;cursor:pointer}.feedback-section textarea{font-size:14px;min-height:100px}.feedback-section button{margin-top:12px}.feedback-section #feedbackStatus{margin-top:8px}
dialog{border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);padding:24px;width:calc(100% - 32px);max-width:520px;max-height:88dvh;overflow:auto;box-shadow:0 12px 50px rgba(30,40,30,.14)}dialog::backdrop{background:rgba(29,36,30,.28)}.dialog-head{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:16px}.dialog-head button{border:0}.dialog-head h2{font-size:22px}dialog p{margin-bottom:16px}dialog input{font-size:16px}.dialog-actions{display:flex;justify-content:space-between;gap:16px;margin:20px 0}.dialog-actions .primary{margin-left:auto}#rulesDialog{max-width:740px}#promptText{font-size:14px;min-height:300px}#keyState{margin-top:8px}.history-item{width:100%;height:auto;text-align:left;padding:14px 0;border:0;border-top:1px solid var(--line);border-radius:0;white-space:normal}.history-item strong{display:block;font-size:15px}.history-item span{display:block;font-size:12px;color:var(--secondary);margin-top:4px}.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--ink);color:var(--surface);font-size:13px;padding:10px 16px;border-radius:8px;box-shadow:0 2px 10px #0002;z-index:5;max-width:calc(100% - 32px)}.mobile-tabs{display:none}.data-details{margin-top:16px;font-size:12px;color:var(--secondary)}.data-details summary{cursor:pointer}.data-details pre{color:var(--ink)}
@keyframes pulse{50%{opacity:.3}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media(min-width:1600px){.workspace{grid-template-columns:minmax(360px,27%) minmax(520px,1fr) minmax(330px,25%)}.conversation{padding:32px 40px}.chat-heading,.composer-wrap{padding-left:40px;padding-right:40px}.pane-intro,.material-controls,.evidence-heading,.evidence-list,.feedback-section{padding-left:28px;padding-right:28px}}
@media(max-width:1050px){.workspace{grid-template-columns:minmax(260px,34%) minmax(380px,1fr)}.evidence-pane{display:none}.workspace[data-active=evidence] .evidence-pane{display:block;grid-column:2;grid-row:1}.workspace[data-active=evidence] .chat-pane{display:none}.header-actions{gap:0}.app-header{padding:0 20px}.connection{margin-right:4px}.message-footer button{border-color:var(--line)}}
@media(max-width:720px){.app-header{height:60px;padding:0 16px}.identity{gap:10px}.wordmark{font-size:22px}h1{font-size:13px}.header-divider{height:16px}.connection{font-size:11px}.header-actions #rulesBtn{display:none}.header-actions button{padding:0 6px;font-size:12px}.mobile-tabs{display:flex;height:48px;background:var(--surface);border-bottom:1px solid var(--line);padding:0 16px;gap:24px}.mobile-tabs button{height:48px;border:0;border-radius:0;padding:0 4px;font-size:14px;position:relative;color:var(--secondary)}.mobile-tabs button[aria-pressed=true]{color:var(--accent)}.mobile-tabs button[aria-pressed=true]:after{content:"";height:2px;background:var(--accent);position:absolute;bottom:0;left:4px;right:4px}.workspace{height:calc(100dvh - 108px);display:block}.pane{height:100%;display:none}.workspace[data-active=chat] .chat-pane{display:flex}.workspace[data-active=book] .book-pane{display:flex}.workspace[data-active=evidence] .evidence-pane{display:block}.chat-heading{padding:18px 20px 14px}.chat-heading h2{font-size:18px}.conversation{padding:20px}.composer-wrap{padding:10px 16px calc(12px + env(safe-area-inset-bottom))}.composer-caption{font-size:11px}.composer-bottom #scopeHint{max-width:52%;font-size:11px}.welcome{padding:16px 0 24px}.welcome h3{font-size:24px}.welcome .question-examples{margin-top:20px}.welcome .question-examples button{font-size:15px;min-height:48px}.reader-scroll{padding:16px 20px 28px}.pane-intro,.material-controls{padding-left:20px;padding-right:20px}.reader-text{font-size:16px;line-height:1.85}.evidence-heading,.evidence-list,.feedback-section{padding-left:20px;padding-right:20px}.evidence-item blockquote{font-size:16px}.radio-row label{min-height:48px;font-size:14px}.radio-row input{width:20px;height:20px}textarea,select{font-size:16px!important}.reader-bar button,.message-footer button,.evidence-actions button,.evidence-actions a,.followups button{min-height:40px;display:inline-flex;align-items:center}.followups button{max-width:88vw}.dialog-head button,.dialog-actions button,.feedback-section button{min-height:44px}.connection{max-width:92px;overflow:hidden;text-overflow:ellipsis}.header-actions #historyBtn{font-size:0;width:42px}.header-actions #historyBtn:after{content:"记录";font-size:12px}.message-body table{font-size:15px}.feedback-section textarea{font-size:16px}.reader-foot{font-size:12px}.selection-summary button{min-height:40px}.evidence-pane{border-left:0}.chat-pane{border:0}}
#returnChatBtn{display:none}@media(min-width:721px) and (max-width:1050px){#returnChatBtn{display:block;margin-bottom:16px}}
@media(pointer:coarse){button{min-height:48px}.app-header button{min-height:48px}.mobile-tabs button{min-height:48px}.radio-row label{min-height:48px}.evidence-actions a{min-height:48px;display:inline-flex;align-items:center}}
/* Focused test layout: source + conversation; evidence opens on demand. */
.app-header{height:60px}.workspace{height:calc(100dvh - 60px);grid-template-columns:minmax(280px,29%) minmax(400px,1fr)}
.evidence-pane{display:none}.workspace[data-active=evidence]{grid-template-columns:minmax(260px,24%) minmax(360px,1fr) minmax(310px,28%)}
.workspace[data-active=evidence] .evidence-pane{display:block;grid-column:3;grid-row:1}.workspace[data-active=evidence] .chat-pane{display:flex}
#returnChatBtn{display:block;float:right;margin:0 0 8px 8px}.pane-intro{padding-top:20px;padding-bottom:12px}.chat-heading{padding-top:18px;padding-bottom:18px}.chat-heading h2{margin:0}.reader-foot summary{cursor:pointer}.welcome{padding:20px 0}.welcome h3{font-size:22px;margin:0 0 8px}.welcome p{font-size:14px}.conversation{max-width:900px;width:100%;align-self:center}.message-header>span{display:none}.diagnostics{font-size:11px}.diagnostics summary{cursor:pointer}.diagnostics span{display:block;margin:6px 0}.tools-menu{position:relative;font-size:13px}.tools-menu>summary{list-style:none;cursor:pointer;padding:8px 12px}.tools-menu>summary::-webkit-details-marker{display:none}.tools-menu>div{position:absolute;right:0;top:40px;width:160px;padding:6px;background:var(--surface);border:1px solid var(--line);border-radius:8px;z-index:4;box-shadow:0 8px 24px #0001}.tools-menu button,.tools-menu a{display:block;width:100%;text-align:left;padding:8px 12px;height:auto;min-height:36px;font-size:13px;text-decoration:none;line-height:20px}.tools-menu a:hover{background:var(--book)}.header-actions #rulesBtn{display:block}.composer-caption{font-size:11px}.composer-bottom .primary span{display:none}
@media(min-width:1600px){.workspace{grid-template-columns:minmax(320px,25%) 1fr}.workspace[data-active=evidence]{grid-template-columns:minmax(300px,23%) 1fr 360px}}
@media(min-width:721px) and (max-width:1100px){.workspace,.workspace[data-active=evidence]{grid-template-columns:minmax(260px,34%) minmax(360px,1fr)}.workspace[data-active=evidence] .evidence-pane{grid-column:2}.workspace[data-active=evidence] .chat-pane{display:none}}
@media(max-width:720px){.workspace,.workspace[data-active=evidence]{display:block;height:calc(100dvh - 108px)}.workspace[data-active=book] .chat-pane,.workspace[data-active=evidence] .chat-pane{display:none}.workspace[data-active=evidence] .evidence-pane{display:block}.tools-menu>summary{min-height:48px;display:flex;align-items:center;padding:0 6px}.app-header{padding:0 12px}.identity{gap:8px}.connection{max-width:84px}.tools-menu>div{top:48px}.tools-menu button,.tools-menu a{min-height:48px;display:flex;align-items:center}#returnChatBtn{display:none}.welcome h3{font-size:21px}.welcome{padding:12px 0}.header-actions #historyBtn{width:auto;font-size:12px}.header-actions #historyBtn:after{display:none}}
/* Inline reading aids preserve the underlying source text and selection offsets. */
button.reading-word{display:inline;position:relative;min-height:0!important;height:auto!important;min-width:0;padding:0;margin:0;border:0;border-radius:0;background:none;font:inherit;line-height:inherit;color:inherit;white-space:normal;vertical-align:baseline;text-decoration:underline dashed #87968b;text-underline-offset:4px;text-decoration-thickness:1px;cursor:pointer;user-select:text;transition:none}
button.reading-word:hover{color:var(--accent);background:var(--accent-soft)}button.reading-word:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.reading-gap::before{content:' ';white-space:pre}.spacing-off .reading-gap{display:none}.reading-toggle{display:flex;align-items:center;gap:8px;font-size:13px;font-weight:400;padding:8px 12px;margin:0;cursor:pointer}.reading-toggle input{width:16px;height:16px;accent-color:var(--accent)}
.pronunciation-popover{position:fixed;z-index:20;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:8px;box-shadow:0 6px 24px #0002;color:var(--ink);font:16px/1.6 -apple-system,BlinkMacSystemFont,'PingFang SC',sans-serif}.pronunciation-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.pronunciation-head strong{font-size:18px;font-weight:600}.pronunciation-head button{height:32px;padding:0 4px;border:0;font-size:12px}.pronunciation-value{font-size:22px;line-height:1.5;margin:10px 0 6px;overflow-wrap:anywhere}.pronunciation-note{font-size:12px;line-height:1.6;color:var(--secondary)}@media(pointer:coarse){.pronunciation-head button{min-height:44px}.reading-toggle{min-height:48px}}

#speechPlayer:not([hidden]){position:fixed;bottom:12px;left:12px;right:12px;z-index:20;padding:12px;background:var(--surface,#fff);border:1px solid #ddd;border-radius:12px;display:flex;gap:12px;align-items:center;flex-wrap:wrap;box-shadow:0 4px 20px #0002}#speechPlayer audio{max-width:100%;flex:1;min-width:180px}#speechStatus{font-size:13px}#speechDialog{max-width:560px}#speechError{color:#a33}

.word-meaning,.word-context,.word-explanation{font-size:14px;line-height:1.7;margin:10px 0}.word-context{padding:8px;background:var(--bg,#f5f4ef);border-radius:4px}.pronunciation-popover>button{margin:8px 8px 0 0}.pronunciation-popover details{font-size:12px;color:var(--secondary)}

/* Reserve player space so playback never covers the question or send button. */
.workspace,.workspace[data-active=evidence]{height:calc(100dvh - 60px - var(--speech-player-space,0px))}
#speechPlayer select{width:auto;min-width:78px;flex:none}#speechPlayer label{margin:0;font-size:12px}#speechStatus{flex-basis:100%}
@media(max-width:720px){.workspace,.workspace[data-active=evidence]{height:calc(100dvh - 108px - var(--speech-player-space,0px))}#speechPlayer:not([hidden]){gap:6px;padding:8px}#speechPlayer audio{min-width:160px}#speechPlayer button{min-height:40px;font-size:12px}}

.phone-code{font-size:32px;font-variant-numeric:tabular-nums;letter-spacing:.2em;margin:16px 0}.login-card{max-width:440px;margin:12vh auto;padding:24px;display:grid;gap:24px}.login-card form{display:grid;gap:12px}