:root{--paper:#f5f2eb;--ink:#282821;--red:#b64130;--muted:#7c7a70;--line:#d4d0c6;--serif:"Songti SC","STSong","Noto Serif CJK SC",SimSun,serif;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}body{margin:0}button,input,textarea,select{font:inherit;color:inherit}button,a{touch-action:manipulation;-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.45}a{color:inherit}button:focus-visible,a:focus-visible,select:focus-visible{outline:2px solid var(--red);outline-offset:5px}.hidden{display:none!important}.app-shell{max-width:1440px;margin:auto;padding:0 64px}.masthead{height:116px;border-bottom:2px solid var(--ink);display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{display:flex;gap:13px;align-items:center;text-decoration:none;flex-shrink:0}.brand>span{font-family:var(--serif);font-size:27px;letter-spacing:2px;font-weight:700}.brand small{display:block;font:10px/1.6 -apple-system,BlinkMacSystemFont,"PingFang SC",sans-serif;letter-spacing:4px;margin-top:5px;color:var(--muted)}.masthead-note{font-family:var(--serif);font-size:13px;letter-spacing:2px}.masthead-note>span{display:block;font:8px/1.6 monospace;letter-spacing:1px;color:var(--muted);margin-top:7px}.header-actions{display:flex;align-items:center;gap:25px}.access-button{border:0;background:transparent;display:flex;gap:7px;align-items:center;font-size:10px;color:var(--muted);padding:10px 0}.small-dot{width:5px;height:5px;background:#878c67;display:inline-block;border-radius:50%}.new-chat,.mobile-new-chat{border:0;border-left:1px solid var(--line);background:transparent;font-size:12px;padding:8px 0 8px 24px}.new-chat span{margin-left:16px;font-size:18px}.mobile-new-chat{display:none}.welcome{margin:0}.hero{display:grid;grid-template-columns:1.15fr 1fr;gap:45px;align-items:center;padding:47px 0 42px}.eyebrow{display:flex;gap:23px;align-items:center;font-size:10px;color:var(--muted);letter-spacing:1px}.issue{font:10px/1.5 monospace;letter-spacing:1px;color:var(--red)}h1{font-family:var(--serif);font-size:clamp(56px,6vw,85px);line-height:1.23;letter-spacing:-2px;font-weight:600;margin:27px 0 23px}.red{color:var(--red)}.intro{font-size:12px;color:#6e6c62;line-height:2.05;margin:0}.hero-caption{display:flex;align-items:center;gap:12px;font-size:10px;letter-spacing:.5px;margin-top:27px;color:#817d70}.caption-rule{width:31px;height:1px;background:var(--red)}.paper-scene{position:relative;height:340px;max-width:430px;width:100%;justify-self:end}.scene-coordinate{font:8px/1.5 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var(--red);border-radius:50%;transform:rotate(-2deg);margin-left:8px}.paper-bottom{font-size:9px;color:#969080;margin-top:19px;letter-spacing:1px}.verify-stamp{position:absolute;right:30px;top:94px;color:var(--red);border:3px double var(--red);width:110px;height:110px;border-radius:50%;transform:rotate(13deg);display:flex;align-items:center;justify-content:center;flex-direction:column;background:#f5f2ebd9}.verify-stamp span{font-family:var(--serif);font-size:25px;letter-spacing:2px;border-bottom:1px solid var(--red);padding-bottom:5px}.verify-stamp small{font-size:11px;letter-spacing:5px;margin-top:5px;padding-left:4px}.hand-note{position:absolute;right:0;bottom:23px;font-family:var(--serif);font-size:15px;line-height:1.7;color:#767260;transform:rotate(-6deg)}.hand-note svg{position:absolute;left:-95px;top:4px;width:80px;height:50px;transform:rotate(165deg);fill:none;stroke:#a89e87;stroke-width:1.4}.scene-index{position:absolute;bottom:-8px;left:25px;font-size:8px;color:#a09989;letter-spacing:1px}.scene-index span{margin-left:25px;font-family:monospace}.topics-heading{display:flex;justify-content:space-between;border-top:1px solid var(--ink);padding:14px 0 0;font-size:10px;letter-spacing:1px}.topics-heading>span:last-child{color:var(--muted);font-size:9px}.starter-grid{display:grid;grid-template-columns:repeat(3,1fr);margin:20px 0 0;border-bottom:1px solid var(--line);padding-bottom:24px}.starter{border:0;border-right:1px solid var(--line);background:transparent;text-align:left;padding:0 27px;transition:color .15s}.starter:first-child{padding-left:0}.starter:last-child{border-right:0;padding-right:0}.topic-number{display:block;font:9px/1.7 monospace;letter-spacing:1px;color:var(--muted)}.starter strong{font:500 22px/1.6 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.15s}.composer:focus-within{border-color:var(--ink)}textarea{border:0;display:block;width:100%;resize:vertical;min-height:52px;max-height:180px;background:transparent;font-size:13px;line-height:1.9;outline:none}textarea::placeholder{color:#a39c8f}.composer-bottom{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:5px}.preferences-button{border:0;background:transparent;display:flex;gap:9px;align-items:center;padding:6px 0;color:var(--muted);font-size:10px}.settings-symbol{font-size:20px;line-height:1;transform:rotate(90deg)}.preference-count{background:#eee6da;color:var(--red);padding:2px 5px;font:10px monospace}.send-area{display:flex;align-items:center;gap:15px}#counter{color:#aaa394;font:9px monospace}.send{background:var(--red);color:#fffaf2;border:0;padding:10px 17px;min-width:94px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:12px;transition:background .15s}.send span{font-size:18px}.send:hover{background:#923325}.stop{background:transparent;border:1px solid var(--line);padding:8px 12px;font-size:11px}.composer-foot{display:flex;justify-content:space-between;gap:20px;font-size:9px;line-height:1.7;color:#969080;margin-top:10px}.composer-foot>span:last-child{font-family:monospace;white-space:nowrap}.preferences{border-top:1px solid var(--line);padding-top:16px;margin-top:14px;display:grid;grid-template-columns:1fr 1.3fr 1fr;gap:20px}.preferences label{font-size:10px;color:var(--muted)}.preferences select{display:block;width:100%;margin-top:7px;background:var(--paper);border:1px solid var(--line);border-radius:0;padding:8px 6px;font-size:11px}.page-footer{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--muted);padding:17px 0 22px;border-top:1px solid var(--line)}.page-footer a{text-decoration:none}.page-footer a:hover{color:var(--red)}.footer-divider{margin:0 9px;color:#b3aa9b}.messages{max-width:850px;margin:45px auto 10px;min-height:45vh}.message{display:flex;gap:20px;align-items:start;margin-bottom:32px}.avatar{width:36px;flex-shrink:0;font:12px/36px var(--serif);text-align:center;color:var(--muted)}.avatar img{width:31px;height:31px;display:block}.message-content{font-size:14px;line-height:2;min-width:0;max-width:calc(100% - 56px);overflow-wrap:anywhere}.message.user{padding:0 0 22px;border-bottom:1px solid var(--line);margin-bottom:26px}.user .message-content{font:500 20px/1.7 var(--serif);white-space:pre-wrap;padding:3px 0}.message-content p{margin:0 0 17px;white-space:pre-wrap}.message-content a{color:var(--red);text-underline-offset:4px}.copy-answer{background:none;border:0;border-bottom:1px solid var(--line);padding:3px 0;color:var(--muted);font-size:10px}.message-meta{font-size:10px;color:var(--muted)}.waiting{display:flex;align-items:center;gap:9px;font-size:12px;color:var(--muted)}.pulse{height:5px;width:5px;background:var(--red);animation:pulse 1.3s infinite}@keyframes pulse{50%{opacity:.25}}.inline-error,.setup-note{color:#92452e;border-left:2px solid var(--red);padding:6px 13px;font-size:12px;line-height:1.8;margin-top:15px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}dialog{background:var(--paper);color:var(--ink);border:1px solid var(--ink);padding:30px;width:430px;max-width:calc(100% - 32px)}dialog::backdrop{background:#28282166}.dialog-heading{display:flex;justify-content:space-between;align-items:center}.dialog-heading button{border:0;background:none;font-size:26px}dialog h2{font:27px var(--serif);margin-top:30px}dialog p{font-size:12px;line-height:1.9;color:var(--muted)}dialog label{font-size:11px;display:block;margin-top:20px}dialog input{width:100%;padding:12px;border:1px solid var(--line);background:#fffcf6;margin-top:8px;outline-color:var(--red)}.primary{background:var(--red);color:white;border:0;padding:13px;width:100%;margin-top:18px;font-size:12px}.logout{border:0;background:none;font-size:11px;padding:12px 0}.dialog-foot{border-top:1px solid var(--line);padding-top:17px;margin-top:23px}.error{color:var(--red)!important}
@media(min-width:1600px){.app-shell{max-width:1390px;padding:0 80px}.hero{padding-top:64px;padding-bottom:55px}.paper-scene{height:370px}.paper,.paper-under{top:50px}.verify-stamp{top:114px}}
@media(max-width:1100px){.app-shell{padding:0 36px}.masthead-note{display:none}.hero{gap:20px}.eyebrow{gap:13px;font-size:9px}.paper-scene{transform:scale(.88);transform-origin:center right}.starter strong{font-size:20px}.intro{font-size:11px}.hero-copy{min-width:0}}
@media(max-width:760px){.app-shell{padding:0 22px}.masthead{height:88px;gap:10px}.brand{gap:9px}.brand img{width:34px;height:34px}.brand>span{font-size:23px}.brand small{font-size:8px;letter-spacing:2px}.header-actions{gap:13px}.access-button{font-size:9px;gap:5px}.new-chat{display:none}.mobile-new-chat{display:block;font-size:10px;padding:7px 0 7px 12px}.hero{grid-template-columns:1fr;padding:29px 0 28px;gap:0;position:relative}.hero-copy{position:relative;z-index:1}.eyebrow{gap:18px;font-size:9px;letter-spacing:0}h1{font-size:61px;letter-spacing:-2px;margin:23px 0 20px}.intro{font-size:12px;line-height:2;max-width:100%}.intro br{display:none}.hero-caption{margin-top:18px;font-size:9px}.paper-scene{display:none}.topics-heading{font-size:9px;letter-spacing:0}.topics-heading>span:last-child{font-size:8px}.starter-grid{margin-top:17px;padding-bottom:18px;gap:0}.starter{padding:0 12px}.starter strong{font-size:16px;line-height:1.6;margin-top:9px;letter-spacing:-.4px}.topic-number{font-size:8px;letter-spacing:0}.topic-link{font-size:9px;line-height:1.5;gap:4px}.topic-link b{font-size:16px}.composer-wrap{padding-top:24px;padding-bottom:14px}.composer-heading{margin-bottom:11px}.composer-heading>span:first-child{font-size:14px}.composer-heading>span:last-child{font-size:9px;max-width:160px;text-align:right}.composer{padding:15px 14px 11px}textarea{font-size:12px;min-height:70px}.send{padding:9px 12px;min-width:80px;gap:15px}.preferences-button{font-size:10px;gap:6px}#counter{display:none}.composer-foot{font-size:8px}.composer-foot>span:last-child{display:none}.page-footer{font-size:9px;padding:15px 0 20px}.preferences{grid-template-columns:1fr;gap:12px}.preferences label{display:flex;justify-content:space-between;align-items:center}.preferences select{width:66%;margin:0;font-size:10px}.messages{margin-top:28px;min-height:50vh}.message{gap:12px}.avatar{width:28px}.avatar img{width:27px;height:27px}.message-content{font-size:13px;max-width:calc(100% - 40px)}.user .message-content{font-size:19px}.footer-divider{margin:0 4px}}
@media(max-width:370px){.app-shell{padding:0 16px}.access-button{display:none}h1{font-size:56px}.starter{padding:0 9px}.starter strong{font-size:15px}.topic-link{font-size:8px}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
/* Keep the opening page in normal reading order; pin the editor only while chatting. */
.composer-wrap{position:relative}
.workspace:has(.messages:not(.hidden)) .composer-wrap{position:sticky}
@media(max-width:760px){h1{font-size:clamp(43px,12.4vw,56px);letter-spacing:-1.5px}.starter strong{font-size:15px}.topic-link{align-items:flex-end}.starter-grid{padding-bottom:21px}.composer-heading>span:last-child{max-width:180px}}
@media(max-width:370px){h1{font-size:43px}.starter strong{font-size:14px}}
@media(max-width:760px){.starter-grid{display:block;margin-top:10px;padding-bottom:0}.starter,.starter:first-child,.starter:last-child{width:100%;display:grid;grid-template-columns:64px minmax(0,1fr) 22px;align-items:center;gap:10px;border-right:0;border-bottom:1px solid var(--line);padding:16px 0;text-align:left}.starter:last-child{border-bottom:0}.starter strong{font-size:17px;line-height:1.6;margin:0;letter-spacing:0}.starter strong br{display:none}.topic-link{font-size:0;display:block;text-align:right}.topic-link b{font-size:20px}.topic-number{font-size:9px;line-height:1.8}.composer-wrap{padding-top:22px}}
.module-nav{display:grid;grid-template-columns:repeat(4,1fr);border-bottom:1px solid var(--line)}.module-nav a{display:flex;align-items:center;gap:12px;padding:20px 16px;font-size:13px;text-decoration:none;border-right:1px solid var(--line)}.module-nav a:first-child{padding-left:0}.module-nav a:last-child{border-right:0}.module-nav a span{font:10px monospace;color:var(--muted)}.module-nav a:hover,.module-nav a.active{color:var(--red)}.module-nav a.active{box-shadow:inset 0 -2px var(--red)}.feature-panel{padding:42px 0}.feature-heading{display:flex;align-items:start;justify-content:space-between;gap:30px;border-bottom:1px solid var(--line);padding-bottom:27px;margin-bottom:28px}.feature-heading h1{font-size:44px;letter-spacing:0;margin:14px 0}.feature-heading p:not(.issue){max-width:760px;font-size:13px;line-height:1.9;color:var(--muted);margin-bottom:0}.feature-heading>button{white-space:nowrap;margin-top:10px}.text-button{border:0;background:none;padding:8px 0;font-size:11px;color:var(--red);text-align:left}.outline-button{border:1px solid var(--ink);padding:11px 16px;background:transparent;font-size:12px;margin:12px 0}.feature-body label{display:block;font-size:12px;line-height:1.8;color:var(--ink);margin-bottom:17px}.feature-body input:not([type=checkbox]),.feature-body select,.feature-body textarea{display:block;width:100%;border:1px solid var(--line);border-radius:0;background:#fcfaf5;padding:11px 12px;margin-top:7px;font-size:13px;line-height:1.8}.feature-body input:focus,.feature-body textarea:focus,.feature-body select:focus{outline:1px solid var(--red)}.feature-body textarea{min-height:110px;resize:vertical}.form-grid,.filter-row{display:grid;grid-template-columns:1fr 1fr;gap:0 24px}.filter-row{grid-template-columns:2fr 1fr}.feature-note{font-size:11px;line-height:1.9;color:var(--muted)}.case-item{padding:26px 0;border-bottom:1px solid var(--line);max-width:960px}.case-meta{display:flex;justify-content:space-between;color:var(--red);font-size:10px}.case-item h2{font:25px var(--serif);margin:16px 0}.case-item>p:not(.feature-note){font-size:13px;line-height:1.95;max-width:850px}.case-advice{border-left:2px solid var(--red);padding-left:13px}.case-item .source-link{display:block;font-size:11px;color:var(--red);margin-top:15px;line-height:1.8}.case-item .text-button{margin-top:12px}.consent-row{display:flex!important;gap:10px;align-items:start;margin-top:17px}.consent-row input{margin-top:6px;flex-shrink:0}#feature-report{max-width:800px}.feature-result{border:1px solid var(--line);padding:24px;margin-top:24px}.feature-result h2{font:24px var(--serif)}.feature-result p{font-size:12px;line-height:1.9}.receipt-query{border-top:1px solid var(--line);margin-top:35px;padding-top:20px;font-size:12px}.receipt-query summary{cursor:pointer;margin-bottom:20px}.poster-layout{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:start}.poster-preview{border:1px solid var(--line);position:sticky;top:20px}.poster-preview svg{display:block;width:100%;height:auto}.poster-editor{margin-top:28px;padding-top:22px;border-top:1px solid var(--line)}.export-actions{display:flex;align-items:center;gap:22px}.quiz-setup{max-width:800px}.quiz-lead{font:28px/1.7 var(--serif);margin-top:0}.follow-actions{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0;border-top:1px solid var(--line);padding-top:16px}.follow-button{font-size:11px;padding:8px 12px;border:1px solid var(--line);background:transparent;color:var(--red);min-height:36px}.follow-button:hover{border-color:var(--red)}.empty-note{padding:25px 0;font-size:13px;color:var(--muted)}
@media(max-width:900px){.module-nav a{font-size:11px;padding:17px 10px;gap:8px}.poster-layout{gap:24px}.feature-heading h1{font-size:38px}}
@media(max-width:760px){.module-nav{grid-template-columns:1fr 1fr}.module-nav a,.module-nav a:first-child{padding:15px 10px;font-size:12px}.module-nav a:nth-child(2){border-right:0}.module-nav a:nth-child(-n+2){border-bottom:1px solid var(--line)}.module-nav a:nth-child(3){padding-left:10px}.feature-panel{padding:28px 0}.feature-heading{display:block;padding-bottom:21px;margin-bottom:22px}.feature-heading h1{font-size:33px}.feature-heading p:not(.issue){font-size:12px}.feature-heading>button{margin-top:14px}.form-grid,.filter-row{grid-template-columns:1fr;gap:0}.poster-layout{grid-template-columns:1fr;gap:25px}.poster-preview{position:static}.case-item h2{font-size:23px}.case-item>p:not(.feature-note){font-size:12px}.quiz-lead{font-size:25px}.feature-body input:not([type=checkbox]),.feature-body select,.feature-body textarea{font-size:16px}.follow-button{font-size:12px;min-height:42px}.feature-note{font-size:11px}.case-meta{font-size:9px}}

.answer-preference{display:flex;align-items:center;flex-wrap:wrap;gap:12px;padding:17px 0;border-bottom:1px solid var(--line);font-size:12px}.answer-preference label{color:var(--ink)}.answer-preference select{border:1px solid var(--line);background:transparent;color:var(--ink);padding:8px 10px;border-radius:0;font:inherit}.answer-preference>span{font-size:10px;color:var(--muted)}@media(max-width:760px){.answer-preference{gap:9px}.answer-preference select{font-size:16px}.answer-preference>span{flex-basis:100%;line-height:1.7}}