.study-dialog{--deep:#1c302e;--juan:#f6edda;--ink:#292923;--gold:#b8955a;--zhu:#a3412c;--mute:#716958;--kai:"Kaiti SC","STKaiti",serif;--song:"Songti SC","STSong",serif;border:0;padding:0;margin:auto;width:min(760px,100vw);max-width:100vw;height:100dvh;max-height:100dvh;color:var(--juan);background:var(--deep);font-family:var(--song);overflow:hidden}.study-dialog::backdrop{background:#0d1918b0}.study-shell{height:100%;display:flex;flex-direction:column;position:relative}.study-header{flex:none;display:flex;gap:16px;align-items:center;padding:8px 16px;border-bottom:1px solid #b8955a55;min-height:58px}.study-header h1{font:24px/1.5 var(--kai);letter-spacing:3px;margin:0}.study-header>span{color:#d1b680;margin-left:auto;font-size:14px}.study-close{background:none;border:0;color:#d1b680;font-size:28px;min-width:44px;min-height:44px}.study-pane{flex:1;min-height:0;display:flex;flex-direction:column;position:relative;overflow:hidden}.study-scroll{flex:1;min-height:0;overflow:auto;padding:24px 16px;overscroll-behavior:contain}.study-leaf{position:relative;color:var(--ink);background:var(--juan);padding:28px 24px;border-radius:3px;box-shadow:inset 0 0 0 5px var(--juan),inset 0 0 0 6px #b8955a99;line-height:1.9;overflow-wrap:anywhere}.study-leaf h2{font:26px/1.5 var(--kai);margin:16px 0}.study-leaf h3{font:21px/1.5 var(--kai);margin:4px 0 10px}.study-caption{color:#92743e;font-size:12px;letter-spacing:2px}.study-origin{font:18px/1.85 var(--song);white-space:pre-wrap;overflow-wrap:anywhere;margin:8px 0 14px}.study-small{font-size:13px;line-height:1.85;color:#aaaf9f;margin:10px 0}.study-leaf .study-small{color:var(--mute)}.study-leaf hr{border:0;border-top:1px solid #b8955a88;margin:18px 0}.study-foot{padding:12px 16px max(16px,env(safe-area-inset-bottom));display:grid;gap:8px;flex:none}.study-btn{font:15px/1.5 var(--song);min-height:44px;padding:10px 14px;border:1px solid transparent;background:var(--zhu);color:var(--juan);border-radius:7px;cursor:pointer}.study-btn.ghost{background:none;border-color:#bdad8588;color:inherit}.study-btn:disabled{opacity:.55;cursor:wait}.study-btn:focus-visible,.study-close:focus-visible{outline:3px solid var(--gold);outline-offset:2px}.study-origin-strip{border-left:2px solid var(--gold);background:#29433f;padding:8px 12px;margin-bottom:15px}.study-origin-strip small{color:#cfad73}.study-origin-strip .study-origin{font-size:14px;margin:4px 0}.study-work-band{padding:8px 14px;font-size:12px;line-height:1.8;color:#d2bd93;border-bottom:1px solid #b8955a55}.study-tabs{display:flex;flex:none;margin:10px 12px 0;border:1px solid #b8955a66;border-radius:6px;overflow:hidden}.study-tabs button{flex:1;min-height:42px;border:0;font:14px var(--song);color:var(--juan);background:none}.study-tabs button.on{color:var(--ink);background:var(--juan)}.study-feed{padding-top:14px}.study-turn{margin-bottom:16px}.study-guest{background:#eadbb8;color:#342f25;border-radius:12px 12px 2px 12px;padding:12px 14px;white-space:pre-wrap;margin:14px 0 14px 30px;line-height:1.85}.study-mentor{background:var(--juan);color:var(--ink);padding:14px 16px;border-radius:3px;line-height:1.9}.study-mentor>small{color:var(--zhu);letter-spacing:1px}.study-prose p{white-space:pre-wrap;overflow-wrap:anywhere;font:17px/1.95 var(--song);margin:12px 0}.study-mentor .study-small{color:var(--mute)}.study-suggestion{border-top:1px solid #b8955a66;padding:8px 0;margin-top:12px}.study-suggestion small{display:block;color:var(--mute);font-size:12px;margin-top:8px}.study-suggestion .study-prose p{font-size:15px}.study-status{color:#d1b680;line-height:1.8;font-size:14px}.study-empty{padding:20px 4px;line-height:1.8;color:#d3c7ab}.study-composer{flex:none;border-top:1px solid #b8955a55;padding:10px 12px max(12px,env(safe-area-inset-bottom));background:var(--deep)}.study-composer form{display:flex;gap:7px;align-items:flex-end}.study-composer textarea{flex:1;min-width:0;resize:vertical;max-height:120px;min-height:44px;background:var(--juan);color:var(--ink);border:1px solid var(--gold);border-radius:10px;padding:10px;font:16px/1.5 var(--song)}.study-inline-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.study-inline-actions .study-btn{flex:1;padding:8px;min-width:100px;font-size:13px}.study-version-tabs{display:flex;gap:6px;overflow:auto;margin-bottom:16px;padding:2px}.study-version-tabs button{flex:none;font-size:12px}.study-pihead{display:flex;justify-content:space-between;gap:14px;border-bottom:3px double #b8955a88;padding-bottom:14px;margin-bottom:18px}.study-pihead h2{font:32px/1.4 var(--kai);letter-spacing:10px;color:var(--zhu);margin:0}.study-pihead small{color:var(--mute);font-size:12px}.study-notice{border-left:2px solid var(--zhu);padding-left:10px;color:var(--mute);font-size:13px}.study-dialog .tq{writing-mode:vertical-rl;font:21px/1.4 var(--kai);letter-spacing:5px;padding:10px 5px;border:1px solid var(--gold);color:var(--ink);background:var(--juan)}.study-dialog .kuan{display:flex;justify-content:flex-end;gap:12px;align-items:center;margin-top:20px}.study-dialog .kuan span{font:18px/1.3 var(--kai);text-align:right;letter-spacing:2px}.study-dialog .kuan small{display:block;color:var(--mute);font:12px/1.7 var(--song);letter-spacing:0}.study-dialog .seal{display:flex;align-items:center;justify-content:center;white-space:pre-line;width:38px;height:38px;background:var(--zhu);color:var(--juan);font:16px/1.05 var(--kai);border-radius:4px;box-shadow:inset 0 0 0 2px var(--zhu),inset 0 0 0 3px #f6eddaaa;transform:rotate(-4deg)}.study-dialog .p2 .leaf{box-shadow:none;margin-top:12px}.study-dialog .p2 .leaf::before,.study-dialog .p2 .leaf::after{content:"";position:absolute;pointer-events:none;border:1px solid var(--gold);inset:6px}.study-dialog .p2 .leaf::after{inset:9px}.study-dialog .p2 .tq{position:absolute;top:-14px;right:22px}.study-dialog .p2 .head{padding-right:52px}.study-dialog .p2 .zl{font:12px var(--song);color:var(--zhu);letter-spacing:3px}.study-material{margin:16px 0}.study-material-tools{display:flex;gap:8px;flex-wrap:wrap}.study-material summary{cursor:pointer;min-height:36px;font-size:14px}.study-material .study-prose p{font-size:15px}.study-material .study-btn.ghost{border-color:#92743e88}.study-error{background:#f6edda;color:var(--zhu);padding:12px;border:1px solid var(--zhu);border-radius:6px;margin:10px 0;line-height:1.8}.study-error p{font-size:14px}.study-error button{margin:4px}.study-sheet-mask{position:absolute;inset:0;background:#0b181aaa;z-index:10;display:flex;align-items:flex-end}.study-editor{padding:22px 20px max(20px,env(safe-area-inset-bottom));max-height:88%;overflow:auto;width:100%;background:var(--juan);color:var(--ink);border-radius:14px 14px 0 0}.study-editor h2{font:25px var(--kai);margin:0 0 18px}.study-editor label{display:block;font-size:14px;line-height:1.8;margin:12px 0}.study-editor input,.study-editor textarea{display:block;width:100%;min-height:40px;border:1px solid #b8955a99;background:#fffaf0;color:var(--ink);padding:9px;border-radius:5px;font:16px/1.7 var(--song)}.study-editor>div>.study-btn{margin-top:10px;width:100%}.study-editor .study-small{color:var(--mute)}.study-loading{padding:32px;line-height:1.8}.study-page-bridge{position:fixed;z-index:20;overflow:hidden;pointer-events:none;border-radius:4px}.study-page-bridge>.study-pane{position:absolute!important;inset:0!important;width:100%!important;height:100%!important;background:var(--deep)}.study-bridge-question{position:absolute;z-index:2;margin:0!important;padding:0!important;background:transparent!important;border:0!important;box-shadow:none!important;pointer-events:none;white-space:pre-wrap}.study-page-bridge *{scrollbar-width:none}.study-page-bridge ::-webkit-scrollbar{display:none}
/* Original opening ceremony: text stays still; frame, title and seal arrive around it. */
.study-dialog .p2 .leaf::before,.study-dialog .p2 .leaf::after{opacity:0;transform:scale(.97);transition:opacity .7s ease .15s,transform .7s ease .15s}
.study-dialog .p2 .leaf::after{transition-delay:.3s}
.study-dialog .p2 .tq{opacity:0;transform:translateY(-16px);transition:opacity .5s ease .6s,transform .7s cubic-bezier(.2,.7,.2,1) .6s}
.study-dialog .p2 .q{transition:color .5s ease 1.1s}
.study-dialog .p2 .zl{opacity:0;transition:opacity .5s ease 1.15s}
.study-dialog .p2 .kuan span{opacity:0;transition:opacity .5s ease 1.35s}
.study-dialog .p2 .seal{opacity:0;transform:rotate(-4deg) scale(1.35);transition:opacity .15s ease 1.5s,transform .38s cubic-bezier(.3,1.5,.5,1) 1.5s}
.study-dialog .p2 .next{opacity:0;transform:translateY(6px);transition:opacity .5s ease 1.8s,transform .5s ease 1.8s}
.study-dialog .p2.open .leaf::before{opacity:1;transform:none}
.study-dialog .p2.open .leaf::after{opacity:.45;transform:none}
.study-dialog .p2.open .tq,.study-dialog .p2.open .zl,.study-dialog .p2.open .kuan span,.study-dialog .p2.open .next{opacity:1;transform:none}
.study-dialog .p2.open .q{color:var(--zhu)}
.study-dialog .p2.open .seal{opacity:1;transform:rotate(-4deg)}
@media(max-width:600px){.study-scroll{padding:20px 12px}.study-leaf{padding:24px 20px}.study-prose p{font-size:16px}.study-composer .study-inline-actions .study-btn{font-size:12px}.study-header h1{font-size:23px}}
@media(prefers-reduced-motion:reduce){.study-dialog .p2 *,.study-dialog .p2 *::before,.study-dialog .p2 *::after{transition:none!important}}

/* Opus D2: preserve ceremony, give the reading itself the first screen. */
.study-dialog textarea{resize:none;font-size:16px}.study-version-tabs{position:relative;scrollbar-width:none}.study-version-tabs .study-btn{white-space:nowrap;min-height:36px}.study-version-tabs .study-btn:not(.ghost){background:var(--juan);color:var(--zhu)}
.study-origin-compact{font-size:13px}.study-origin-compact summary{cursor:pointer;color:#cfad73}
.study-material{box-shadow:none;border:1px solid #b8955a88;padding:12px 16px}.study-material .study-inline-actions .study-btn{flex:none;min-width:44px;background:none;border:0;padding:6px;color:var(--zhu)}.study-material details .study-prose,.study-sources .study-prose{max-height:45vh;overflow:auto;overscroll-behavior:contain}.study-sources{padding:14px 2px;line-height:1.9;font-size:14px}.study-sources>details{margin:10px 0}.study-sources summary{cursor:pointer}
.study-composer>.study-inline-actions{gap:12px;margin-top:5px}.study-composer>.study-inline-actions .study-btn{border:0;flex:none;min-width:0;min-height:30px;padding:3px 0;white-space:nowrap}.study-pihead{position:relative;padding-right:30px;min-height:76px}.study-dialog .pi .tq{position:absolute;top:0;right:0;font-size:12px;line-height:1.15;letter-spacing:.05em;padding:4px 2px}
@media(max-height:640px){.study-header{min-height:44px;padding:0 12px}.study-header h1{font-size:21px}.study-work-band{flex:none;padding:2px 12px;height:24px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.study-tabs{margin:6px 12px 0}.study-tabs button{min-height:34px}.study-scroll{padding:12px}.study-origin-compact{padding:6px 10px;margin-bottom:8px}.study-version-tabs{margin-bottom:8px}.study-version-tabs .study-btn{padding:5px 8px}.study-leaf.pi{padding:14px 16px}.study-pihead{min-height:60px;padding-bottom:8px;margin-bottom:8px}.study-pihead h2{font-size:26px}.study-composer{padding:6px 12px max(8px,env(safe-area-inset-bottom))}.study-composer>.study-inline-actions{gap:8px}.study-composer:has(textarea:focus) .study-inline-actions{display:none}}

.study-nowrap{white-space:nowrap}.study-origin-compact summary{display:flex;align-items:baseline;gap:8px;list-style:none}.study-origin-preview{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--juan)}.study-origin-compact[open] .study-origin-preview{visibility:hidden}.study-composer>.study-inline-actions{column-gap:16px}.study-composer>.study-inline-actions .study-btn{min-height:36px;color:#d1b680}.study-composer>.study-inline-actions .study-btn+.study-btn::before{content:"│";margin-right:12px;color:#b8955a66}

/* R4 material panels follow Opus D1; format/limits/status come from the server. */
.study-editor-tabs{display:flex;border:1px solid var(--gold);border-radius:6px;overflow:hidden;margin:12px 0}.study-editor-tabs .study-btn{flex:1;border-radius:0;border:0;background:var(--deep);color:var(--juan)}.study-editor-tabs .study-btn.ghost{background:none;color:var(--ink)}
.study-material-heading{display:flex;align-items:baseline;justify-content:space-between;gap:10px}.study-material-heading h3{min-width:0}.study-file-status{font-size:12px;line-height:1.6;white-space:nowrap;border:1px solid #b8955a99;border-radius:12px;padding:2px 8px;color:#68552e}.study-file-status.ready{color:#3c6356;border-color:#78917f}.study-file-status.partial,.study-file-status.failed{color:var(--zhu);border-color:#a3412c88}
.study-file-picker{border:1px dashed var(--gold);border-radius:7px;padding:12px;text-align:center}.study-file-picker input{font-size:16px;max-width:100%;margin-top:8px;border:0;background:transparent;padding:4px}.study-selected-file{padding:10px;background:#eadfca;border-radius:5px;overflow-wrap:anywhere;font-size:14px}
.study-file-note{font-size:14px;color:var(--mute)}.study-file-unread{border-left:2px solid var(--zhu);padding-left:10px;font-size:14px;line-height:1.8}.study-file-unread p{margin:5px 0}.study-file-segments section{padding:12px 0;border-top:1px solid #b8955a55}.study-file-segments h4{font:16px var(--kai);margin:4px 0;color:var(--zhu)}.study-original-link{display:inline-block;color:var(--zhu);font-size:14px;min-height:36px;padding:6px 0;text-decoration:underline;text-underline-offset:3px}.study-original-image{max-width:100%;height:auto;display:block}.study-file-original{margin:6px 0}.study-material .study-file-segments .study-prose{max-height:none;overflow:visible}

/* R4: material handoff within the conversation; Opus reception D2/D3. */
.study-attach{flex:none;width:40px;height:40px;border-radius:50%;border:1px solid var(--gold,#B49A5E);background:transparent;color:#F6EDDA;font-size:24px}
.study-guest-materials{display:flex;flex-direction:column;align-items:flex-end;gap:8px;margin:10px 0}.study-file-thumb{display:block;max-width:230px;padding:0;border:1px solid #B49A5E;border-radius:5px;background:#F6EDDA;color:#2A251D;overflow:hidden;cursor:pointer}.study-file-thumb img{display:block;width:120px;max-height:180px;object-fit:contain}.study-file-thumb span{display:block;padding:12px;overflow-wrap:anywhere}.study-file-receipt{display:flex;align-items:center;justify-content:flex-end;gap:8px;color:#C9C1AA;font-size:12px}.study-file-receipt .study-btn{padding:3px 0;min-height:28px;border:0;text-decoration:underline}
.study-attachment-tray{display:flex;gap:8px;align-items:center;padding:8px 0;color:#F6EDDA;font-size:12px}.study-attachment-tray>img{width:52px;height:64px;object-fit:contain;background:#F6EDDA}.study-attachment-tray>span{overflow-wrap:anywhere;min-width:0}.study-attachment-tray .study-btn{margin-left:auto;flex:none}
.study-pick-options{display:flex;gap:10px}.study-pick-options>label{flex:1;min-width:0}.study-pick-options input{max-width:100%}.study-drawer-head{display:flex;align-items:center;justify-content:space-between;gap:8px}.study-drawer-head h2{margin:0;font-weight:400}.study-archive-mask{position:absolute;inset:0;background:#0E1716A8;z-index:5;display:flex;align-items:flex-end}.study-archive{width:100%;max-height:88%;overflow:auto;border-top:2px solid #B49A5E;border-radius:14px 14px 0 0;background:#F6EDDA;color:#2A251D;padding:16px}.study-archive>.study-scroll{overflow:visible;padding:8px 0}.study-archive .study-small{color:#7B6F5B}.study-header>.study-btn{font-size:12px;padding:3px 7px;min-height:30px;margin-left:auto}.study-sheet-mask{z-index:7}

.study-mentor>.study-btn.ghost{border:0;border-bottom:1px solid #D7A898;background:none;border-radius:0;padding:3px 0;min-height:30px;color:#A3412C}

.study-file-thumb img{height:160px;max-height:160px;object-fit:contain}.study-guest-materials.study-receipt-group{margin:4px 0 12px}